Phthalic acid anhydrides. Can be substituted on any carbon atom. Used extensively in industry and as a reagent in the acylation of amino- and hydroxyl groups.
A group of compounds that has the general structure of a dicarboxylic acid-substituted benzene ring. The ortho-isomer is used in dye manufacture. (Dorland, 28th ed)
Chemical compounds derived from acids by the elimination of a molecule of water.
Used in copolymerization reactions, in the Diels-Alder(diene)synthesis, in the preparation of resins, pharmaceuticals and agricultural chemicals. It is a powerful irritant and causes burns.
Compounds used extensively as acetylation, oxidation and dehydrating agents and in the modification of proteins and enzymes.
Isomeric forms and derivatives of hexanol (C6H11OH).
An ester of phthalic acid. It appears as a light-colored, odorless liquid and is used as a plasticizer for many resins and elastomers.
A subclass of anhydrides with the general structure of dihydrofurandione. They can be substituted on any carbon atom. They modify and inhibit proteins and enzymes and are used in the acylation of amino- and hydroxyl groups.
Materials incorporated mechanically in plastics (usually PVC) to increase flexibility, workability or distensibility; due to the non-chemical inclusion, plasticizers leach out from the plastic and are found in body fluids and the general environment.
"Esters are organic compounds that result from the reaction between an alcohol and a carboxylic acid, playing significant roles in various biological processes and often used in pharmaceutical synthesis."
A common interstitial lung disease caused by hypersensitivity reactions of PULMONARY ALVEOLI after inhalation of and sensitization to environmental antigens of microbial, animal, or chemical sources. The disease is characterized by lymphocytic alveolitis and granulomatous pneumonitis.
A form of alveolitis or pneumonitis due to an acquired hypersensitivity to inhaled avian antigens, usually proteins in the dust of bird feathers and droppings.
A genus of gram-positive bacteria whose spores are round to oval and covered by a sheath.
A form of alveolitis or pneumonitis due to an acquired hypersensitivity to inhaled antigens associated with farm environment. Antigens in the farm dust are commonly from bacteria actinomycetes (SACCHAROPOLYSPORA and THERMOACTINOMYCES), fungi, and animal proteins in the soil, straw, crops, pelts, serum, and excreta.
Inflammation of the lung due to harmful effects of ionizing or non-ionizing radiation.
Oils which are used in industrial or commercial applications.
Antibodies which elicit IMMUNOPRECIPITATION when combined with antigen.

Efficacy of measures of hygiene in workers sensitised to acid anhydrides and the influence of selection bias on the results. (1/80)

OBJECTIVES: Organic acid anhydrides are potential sensitisers and cause occupational airway diseases. In an intervention study the efficacy of measures of hygiene at the workplace and possible selection bias were investigated. METHODS: A first investigation with 110 workers exposed to hexahydrophthalic acid anhydride (HHPA) and methyltetrahydrophthalic acid anhydride (MTHPA) was carried out in July 1991. The results (skin prick test, specific serum IgE) showed that 20 people were sensitised, and in a challenge test the clinical relevance of the sensitisation was confirmed in six subjects. In December 1991, the hygiene conditions at the plant were improved. In November 1995 a second investigation of 84 people was performed (anamnesis, skin prick test, specific IgE, spirometry, and ambient and biological monitoring). The 27 people who had left the plant in the meantime were asked their reasons for leaving. RESULTS: The relative risk of people sensitised in 1991 of leaving the plant between 1991 and 1995 was 2.6 (95% confidence interval (95% CI) 1.4 to 4.9) compared with people without any sign of sensitisation. The percentage of people identified as sensitised in 1991, who were still working at the plant and came to the second investigation, was higher than for people without evidence of sensitisation (10/10 v 47/73; p < 0.05). In all the 10 sensitised people in 1991 the findings of the first investigation were confirmed in 1995. The rate of sensitisation in 1995 was 21%. None of the six people employed after 1991 showed evidence of sensitisation. Of the six people with clinically relevant sensitisation confirmed by a challenge test in 1991, five were still at their workplace. From 1991 they were only exposed to MTHPA at a reduced concentration (< 0.5-36 micrograms/m3 in 1995). All of them reported fewer symptoms than in 1991. No signs of bronchial obstruction were detected by spirometry at the workplace. CONCLUSIONS: In cross sectional studies there is a selection bias with a risk of underestimating the incidence of allergic diseases. The results further suggest that the improved hygiene conditions probably had a positive effect on the symptoms in sensitised people.  (+info)

Determination of methyltetrahydrophthalic anhydride in air using gas chromatography with electron-capture detection. (2/80)

Methyltetrahydrophthalic anhydride (MTHPA) stimulates the production of specific IgE antibodies which can cause occupational allergy even at extremely low levels of exposure (15-22 micrograms/m3). Safe use in industry demands control of the levels of exposure causing allergic diseases. Thus, the air monitoring of MTHPA is very important, and sensitive methods are required to measure low air concentrations or short-time peak exposures. This paper outlines the use of silica-gel tubes for sampling airborne MTHPA vapour, followed by analysis using gas chromatography with electron-capture detection. No breakthrough was observed at 113, 217, 673 and 830 micrograms/m3 (sampling volume 30, 60, 60 and 20 l, respectively; relative humidity 40-55%). Concentrations > 1.0 microgram/m3 could be quantified at 20-min sampling with a sampling rate of 1 l/min. The present method can also be applied to measurements of exposure to hexahydrophthalic and methylhexahydrophthalic anhydride. The risk of MTHPA exposure in two condenser plants was also assessed by determining MTHPA levels in air of the workplace. In conclusion, our method was found to be reliable and sensitive, and can be applied to the evaluation of MTHPA exposure.  (+info)

Human leucocyte antigens (HLA) and trimellitic anhydride (TMA) immunological lung disease. (3/80)

Occupational immunological lung disease, due to low molecular weight, reactive chemicals such as trimellitic anhydride (TMA), is an emerging health problem. If there were a marker that was highly predictive of the ability of the immune system to recognize TMA as an allergen, better prevention strategies could be employed with at risk individuals. The purpose of this study is to evaluate whether human leucocyte antigen (HLA) class specificity is associated with the development of late respiratory systemic syndrome (LRSS) or asthma due to immunological sensitivity to trimellitic anhydride (TMA). This is a case control study of 17 individuals with LRSS, 12 with asthma and 22 TMA similarly exposed individuals who did not develop LRSS or asthma. Comparing the sensitized individuals (LRSS or asthma) with the non-sensitized individuals (controls), we found no difference in frequency of any HLA antigen. In summary, the lack of association of HLA antigens with LRSS or asthma due to TMA suggests that these will not be useful markers to identify at risk individuals.  (+info)

Trimellitic anhydride-induced allergic response in the guinea pig lung involves antibody-dependent and -independent complement system activation. (4/80)

Trimellitic anhydride (TMA) is one of many low molecular weight compounds known to cause occupational asthma. In our previous studies the TMA-induced allergic response in guinea pigs was attenuated by depletion of complement. Specifically, the leakage of red blood cells and infiltration of inflammatory cells into the lung after TMA challenge was significantly reduced. Thus, we hypothesize that in the presence of specific antibody, TMA activates the complement system and complement activation products play a role in mediating inflammatory cell infiltration into the lung and lung hemorrhage. Guinea pigs were sensitized by intradermal injection of TMA in corn oil. An increase in the complement activation product C3a was detected in bronchoalveolar lavage, but not in plasma, of both sensitized and nonsensitized guinea pigs after intratracheal challenge with TMA conjugated to GPSA (TMA-GPSA). In vitro experiments demonstrated that TMA-GPSA caused complement activation by antibody-dependent as well as antibody-independent pathways. In sensitized animals, TMA-GPSA challenge caused significant increases in eosinophils, neutrophils, and macrophages in lung, along with increases in red blood cells and protein in the airspace. The infiltration of eosinophils was unique in that the magnitude of the GPSA/TMA-GPSA effect was significantly different between nonsensitized and sensitized animals. C3a concentrations in BAL correlated with all measures of cell infiltration in sensitized animals, but not in nonsensitized animals. These data indicate that complement activation in the absence of antibody is not sufficient for the complete allergic response to occur. Both sensitization and the complement system are required for TMA-induced eosinophilia.  (+info)

Synthesis of corollosporine, an antibacterial metabolite of the marine fungus Corollospora maritima. (5/80)

Corollosporine [(+/-)-3-hexyl-3,7-dihydroxy-1(3H)-isobenzofuran-1-one], an antibacterial metabolite of the marine fungus, Corollospora maritima, was synthesized by four different routes from 3-hydroxyphthalic anhydride or 2-methoxybenzoic acid as the starting material to verify its proposed structure.  (+info)

Total plasma protein adducts of allergenic hexahydrophthalic and methylhexahydrophthalic anhydrides as biomarkers of long-term exposure. (6/80)

OBJECTIVES: The aim of this study was to evaluate the applicability of total plasma protein adducts (TPPA) of 2 sensitizing low-molecular-weight allergens, hexahydrophthalic anhydride (HHPA) and methylhexahydrophthalic anhydride (MHHPA), as biomarkers of long-term exposure. METHODS: Urine samples from occupationally exposed workers were analyzed for the levels of urinary metabolites of HHPA and MHHPA, and the levels were used as the index of exposure. In addition, blood samples were obtained from the same persons, and the levels of TPPA were determined. Reversed solid phase extraction, derivatization using pentafluorobenzyl bromide, and gas chromatography-mass spectrometry analysis in the negative ion chemical ionization mode were used to quantify the exposure. To assess the suitability of TPPA as a biomarker of exposure to the anhydrides, the TPPA levels were correlated to urinary metabolite levels and hemoglobin (Hb) adducts. The toxicokinetics of TPPA were also studied to determine the elimination half-time of the adducts. RESULTS: The levels of TPPA correlated exceptionally well with the metabolite levels in the urine sampled repeatedly, giving r=0.97 for HHPA and r=0.92 for MHHPA. The TPPA of HHPA correlated highly with the Hb adducts with r=0.86. There were also good correlations between single urinary determinations and the TPPA levels (r(s)=0.71 and 0.81, respectively, for HHPA and MHHPA). The in vivo decay of TPPA gave an elimination half-time of 22 days for HHPA and 24 days for MHHPA. CONCLUSIONS: TPPA levels of HHPA and MHHPA are excellent biomarkers of long-term exposure to anhydrides.  (+info)

Trimellitic anhydride-induced eosinophilia in a mouse model of occupational asthma. (7/80)

Trimellitic anhydride (TMA) is a low-molecular-weight chemical known to cause occupational asthma. The present study was designed to determine if TMA elicited eosinophil infiltration into lungs of sensitized mice similar to previous studies with the protein allergen ovalbumin (OA). BALB/c mice were sensitized intradermally with 0.1 ml of 3% TMA or 0.3% OA in corn oil followed by intratracheal instillation with TMA conjugated to mouse serum albumin (TMA-MSA; 30 or 400 microg) or OA (30 microg). Nonsensitized mice received corn oil vehicle intradermally and MSA (30 microg) intratracheally. The allergic response was elicited 3 weeks later by intratracheal instillation of 30 or 400 microg TMA-MSA, OA, or control MSA. Cellular infiltration into bronchoalveolar lavage fluid (BAL) was determined 72 h later. Eosinophil peroxidase (EPO) and myeloperoxidase (MPO) activity in lung homogenates was used as an estimate of numbers of eosinophils and neutrophils, respectively, in lung tissue. In TMA-sensitized mice, TMA-MSA challenge significantly increased numbers of eosinophils in BAL and EPO in lung, indicating an increase in number of eosinophils in the airway and tissue. In nonsensitized mice, TMA-MSA challenge also caused a small but significant increase in eosinophils in BAL compared to MSA control. Total IgE in both plasma and BAL was significantly higher in TMA-sensitized compared to nonsensitized mice. The eosinophil infiltration in TMA-sensitized mice was similar in magnitude to the response in OA-sensitized mice. These studies are the first to demonstrate TMA-induced eosinophilia in mouse lung and to provide a model for comparing mechanisms and mediators responsible for the substantial eosinophilia induced by TMA and OA.  (+info)

Exposure to hexahydrophthalic and methylhexahydrophthalic anhydrides--dose-response for sensitization and airway effects. (8/80)

OBJECTIVES: This study clarified the exposure-response relationships for the organic acid anhydrides (OAA) hexahydrophthalic (HHPA) and methylhexahydrophthalic (MHHPA) anhydrides and the development of specific immunoglobulin (IG) E and G antibodies and work-related symptoms. METHODS: In an epoxy resin-using factory, air levels of OAA were determined by gas chromatography-mass spectrometry. Occupational, smoking, and medical histories (questionnaire) were obtained for 154 exposed workers and 57 referents. Work-related symptoms of the eyes and airways were recorded, and OAA metabolites were analyzed in urine. A skin-prick test with common allergens and conjugates of OAA were performed. Specific IgE (radioallergosorbent test) and IgG (enzyme-linked immumosorbent assay) antibodies were determined in serum, and spirometry was performed. RESULTS: Air levels of the OAA were low (HHPA < 1 to 94, MHHPA < 3 to 77 microg/m3) and associated with the concentrations of the OAA metabolites in urine. Furthermore, for the exposed workers, there were high prevalences of sensitization (IgE 22%, IgG 21%), which correlated with the exposure. Neither atopy nor smoking increased this risk significantly. Furthermore, work-related symptoms were more prevalent among the exposed workers than among the referents (eyes 23% versus 14%, nose 28% versus 16%, nose bleeding 8% versus 0%, lower airways 10% versus 4%), and they were related to the exposure (adjusted prevalence odds ratios (POR) in the highest group 7.7, 3.6 and 17, respectively) and the IgE levels (POR 4.9, 3.1 and 5.6, respectively). CONCLUSIONS: In spite of the very low OAA levels in the air and metabolites in the urine, there were high and exposure-related risks of specific IgE and IgG sensitization and of work-related symptoms for the eyes, nose (especially bleeding), and lower airways.  (+info)

I'm sorry for any confusion, but "Phthalic Anhydrides" is not a medical term. It is a chemical compound with the formula C6H4(CO)2O. Phthalic anhydride is a white crystalline powder used in the industrial synthesis of plasticizers, resins, and dyes.

If you have any questions about medical terminology or concepts, please don't hesitate to ask!

Phthalic acids are organic compounds with the formula C6H4(COOH)2. They are white crystalline solids that are slightly soluble in water and more soluble in organic solvents. Phthalic acids are carboxylic acids, meaning they contain a functional group consisting of a carbon atom double-bonded to an oxygen atom and single-bonded to a hydroxyl group (-OH).

Phthalic acids are important intermediates in the chemical industry and are used to produce a wide range of products, including plastics, resins, and personal care products. They are also used as solvents and as starting materials for the synthesis of other chemicals.

Phthalic acids can be harmful if swallowed, inhaled, or absorbed through the skin. They can cause irritation to the eyes, skin, and respiratory tract, and prolonged exposure can lead to more serious health effects. Some phthalates, which are compounds that contain phthalic acid, have been linked to reproductive and developmental problems in animals and are considered to be endocrine disruptors. As a result, the use of certain phthalates has been restricted in some countries.

Anhydrides are chemical compounds that form when a single molecule of water is removed from an acid, resulting in the formation of a new compound. The term "anhydride" comes from the Greek words "an," meaning without, and "hydor," meaning water.

In organic chemistry, anhydrides are commonly formed by the removal of water from a carboxylic acid. For example, when acetic acid (CH3COOH) loses a molecule of water, it forms acetic anhydride (CH3CO)2O. Acetic anhydride is a reactive compound that can be used to introduce an acetyl group (-COCH3) into other organic compounds.

Inorganic anhydrides are also important in chemistry and include compounds such as sulfur trioxide (SO3), which is an anhydride of sulfuric acid (H2SO4). Sulfur trioxide can react with water to form sulfuric acid, making it a key intermediate in the production of this important industrial chemical.

It's worth noting that some anhydrides can be hazardous and may require special handling and safety precautions.

I believe there may be some confusion in your question. Maleic anhydride is not a medical term, but rather a chemical compound with the formula C2H2O3. It is a white crystalline solid that is used in industrial applications such as the production of polymers and resins.

If you are asking about a medical condition related to exposure or sensitivity to maleic anhydride, I would recommend consulting a medical professional for accurate information. However, in general, inhalation or skin contact with maleic anhydride can cause irritation and respiratory symptoms, and prolonged exposure may lead to more serious health effects. People with sensitivities or allergies to the compound may experience more severe reactions.

Acetic anhydride is a chemical compound with the formula (CH3CO)2O. It is a colorless liquid that is used as a reagent in organic synthesis, particularly in the production of cellulose acetate and other acetate esters. Acetic anhydride is also an important intermediate in the synthesis of certain pharmaceuticals and dyes.

In medical terminology, acetic anhydride is not typically used as a diagnostic or therapeutic agent. However, it can be used in laboratory settings to synthesize compounds that may have medical applications. For example, acetic anhydride has been used to produce certain antiviral drugs and antibiotics.

It is important to note that acetic anhydride can be harmful or fatal if swallowed, inhaled, or absorbed through the skin. It can cause burns and eye damage, and may be harmful to the respiratory system if inhaled. Therefore, it should be handled with care and used only in well-ventilated areas with appropriate personal protective equipment.

Hexanols are a class of organic compounds that contain a hexanol functional group, which is a hydroxyl group (-OH) attached to a linear or branched carbon chain containing six carbon atoms. They can be either primary, secondary, or tertiary alcohols depending on the position of the hydroxyl group in relation to the carbon chain. Hexanols are used in various applications such as in the production of flavors, fragrances, and industrial chemicals.

Diethylhexyl Phthalate (DEHP) is a type of phthalate compound that is commonly used as a plasticizer, a substance added to plastics to make them more flexible and durable. DEHP is a colorless, oily liquid with an odor similar to oil or benzene. It is soluble in organic solvents but not in water.

DEHP is used primarily in the production of polyvinyl chloride (PVC) plastics, such as flexible tubing, hoses, and medical devices like blood bags and intravenous (IV) lines. DEHP can leach out of these products over time, particularly when they are subjected to heat or other stressors, leading to potential human exposure.

Exposure to DEHP has been linked to a variety of health effects, including reproductive toxicity, developmental and neurological problems, and an increased risk of cancer. As a result, the use of DEHP in certain applications has been restricted or banned in some countries. The medical community is also moving towards using alternative plasticizers that are considered safer for human health.

I'm sorry for any confusion, but "Succinic Anhydrides" is not a recognized medical term. Succinic anhydride is a chemical compound with the formula (CH2)2(CO)2O. It is used in organic synthesis as a dehydrating agent and acylating agent. If you're asking about a medical application or effect of succinic anhydride or its derivatives, I would need more specific information to provide an accurate and helpful response.

Plasticizers are substances added to polymers or plastics to increase their flexibility, workability, and durability. They achieve this by reducing the intermolecular forces between polymer chains, thereby lowering the glass transition temperature (Tg) of the material. This allows the plastic to remain flexible even at lower temperatures. Common plasticizers include phthalates, adipates, and epoxy compounds. It is important to note that some plasticizers can have potential health concerns, and their use may be regulated in certain applications.

Esters are organic compounds that are formed by the reaction between an alcohol and a carboxylic acid. They are widely found in nature and are used in various industries, including the production of perfumes, flavors, and pharmaceuticals. In the context of medical definitions, esters may be mentioned in relation to their use as excipients in medications or in discussions of organic chemistry and biochemistry. Esters can also be found in various natural substances such as fats and oils, which are triesters of glycerol and fatty acids.

Extrinsic allergic alveolitis is a type of lung inflammation that occurs in response to inhaling organic dusts or mold spores that contain allergens. It is also known as hypersensitivity pneumonitis. This condition typically affects people who have been repeatedly exposed to the allergen over a period of time, such as farmers, bird fanciers, and workers in certain industries.

The symptoms of extrinsic allergic alveolitis can vary but often include cough, shortness of breath, fever, and fatigue. These symptoms may develop gradually or suddenly, depending on the frequency and intensity of exposure to the allergen. In some cases, the condition may progress to cause permanent lung damage if it is not treated promptly.

Diagnosis of extrinsic allergic alveolitis typically involves a combination of medical history, physical examination, imaging studies such as chest X-rays or CT scans, and pulmonary function tests. In some cases, blood tests or bronchoscopy with lavage may also be used to help confirm the diagnosis.

Treatment for extrinsic allergic alveolitis typically involves avoiding further exposure to the allergen, as well as using medications such as corticosteroids to reduce inflammation and relieve symptoms. In severe cases, hospitalization and oxygen therapy may be necessary. With prompt and appropriate treatment, most people with extrinsic allergic alveolitis can recover fully and avoid long-term lung damage.

"Bird Fancier's Lung" is a type of hypersensitivity pneumonitis, which is a lung disease that results from an immune system reaction to inhaled dust particles. In the case of Bird Fancier's Lung, the dust particles come from bird droppings or feathers and are inhaled by people who keep birds as pets or work with them in aviaries or breeding facilities.

The immune system of susceptible individuals mounts an inflammatory response to the inhaled antigens, leading to symptoms such as cough, shortness of breath, fever, and fatigue. Over time, repeated exposure can lead to scarring and thickening of the lung tissue, which can impair lung function and cause irreversible damage.

The medical definition of Bird Fancier's Lung is: "A hypersensitivity pneumonitis caused by inhalation of antigens derived from avian proteins, most commonly found in people who keep birds as pets or work with them in aviaries or breeding facilities."

"Saccharopolyspora" is a genus of Gram-positive, aerobic bacteria that forms branched hyphae and spores. These bacteria are known for their ability to produce various bioactive compounds, including antibiotics and enzymes. They are commonly found in soil, water, and decaying vegetation. One species of this genus, Saccharopolyspora erythraea (formerly known as Actinomyces erythreus), is the source of the antibiotic erythromycin.

It's important to note that "Saccharopolyspora" is a taxonomic category used in bacterial classification, and individual species within this genus may have different characteristics and medical relevance. Some species of Saccharopolyspora can cause infections in humans, particularly in immunocompromised individuals, but these are relatively rare.

If you're looking for information on a specific species of Saccharopolyspora or its medical relevance, I would need more context to provide a more detailed answer.

Farmer's lung is a type of hypersensitivity pneumonitis, which is a lung inflammation caused by an allergic reaction to inhaled organic dusts. It is commonly associated with farmers and agricultural workers who are exposed to moldy hay, straw, or grain. When these materials are disturbed, such as during farming activities like harvesting, baling, or cleaning, the mold spores become airborne and can be inhaled, leading to an immune response in susceptible individuals.

The symptoms of Farmer's lung typically include cough, shortness of breath, fever, fatigue, and chest tightness, which usually occur within 4-6 hours after exposure. The condition can cause permanent lung damage if not properly diagnosed and managed with avoidance of exposures and/or medication. It is important for farmers and agricultural workers to use appropriate personal protective equipment, such as masks, and to ensure that their work environments are well-ventilated to reduce the risk of developing Farmer's lung.

Radiation pneumonitis is a inflammatory reaction in the lung tissue that occurs as a complication of thoracic radiation therapy. It usually develops 1-3 months following the completion of radiation treatment. The symptoms can range from mild to severe and may include cough, shortness of breath, fever, and chest discomfort. In severe cases, it can lead to fibrosis (scarring) of the lung tissue, which can cause permanent lung damage. Radiation pneumonitis is diagnosed through a combination of clinical symptoms, imaging studies such as chest X-ray or CT scan, and sometimes through bronchoscopy with lavage. Treatment typically involves corticosteroids to reduce inflammation and supportive care to manage symptoms.

I'm sorry for any confusion, but "Industrial Oils" is not a term that has a specific medical definition. Industrial oils are typically used in machinery and equipment for various industrial applications, such as hydraulic systems, lubricants, and coolants. They are not directly related to medicine or human health.

However, if a person were to come into contact with these oils through their occupation, there could be potential health effects, such as skin irritation or respiratory issues, depending on the specific type of oil and the nature of the exposure. But this would not fall under a medical definition of the term itself.

Precipitins are antibodies (usually of the IgG class) that, when combined with their respective antigens in vitro, result in the formation of a visible precipitate. They are typically produced in response to the presence of insoluble antigens, such as bacterial or fungal cell wall components, and can be detected through various immunological techniques such as precipitation tests (e.g., Ouchterlony double diffusion, radial immunodiffusion).

Precipitins are often used in the diagnosis of infectious diseases, autoimmune disorders, and allergies to identify the presence and specificity of antibodies produced against certain antigens. However, it's worth noting that the term "precipitin" is not commonly used in modern medical literature, and the more general term "antibody" is often preferred.

It is the anhydride of phthalic acid. Phthalic anhydride is a principal commercial form of phthalic acid. It was the first ... Phthalic acid is however easily dehydrated to form phthalic anhydride. Above 180 °C, phthalic anhydride re-forms. Chiral ... Phthalic anhydride is a degradation product of CAP. Phthalic anhydride is a versatile intermediate in organic chemistry, in ... Studies show that exposure to phthalic anhydride can cause rhinitis, chronic bronchitis, and asthma. Phthalic anhydride's ...
The more commonly used polyacids are phthalic, isophthalic, terephthalic and adipic acid. Phthalic and trimellitic anhydrides ... Acids include isophthalic, terephthalic, adipic, benzoic, succinic acids and phthalic, maleic and trimellitic anhydride. ... To make them waterborne organic acids or anhydrides are added in a two-stage process but there are other methods too. ... With alkyds typical methods include maleinazation of unsaturated fatty acids with maleic anhydride. This involves making a ...
It is the imide derivative of phthalic anhydride. It is a sublimable white solid that is slightly soluble in water but more so ... Phthalimide can be prepared by heating phthalic anhydride with alcoholic ammonia giving 95-97% yield. Alternatively, it may be ... "Phthalic Acid and Derivatives". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a20_ ... prepared by treating the anhydride with ammonium carbonate or urea. It can also be produced by ammoxidation of o-xylene. ...
Wainwright, Mark S.; Foster, Neil R. (1 January 1979). "Catalysts, Kinetics and Reactor Design in Phthalic Anhydride Synthesis ...
o-Xylene is an important precursor to phthalic anhydride. The demand for isophthalic acid is relatively modest, so m-xylene is ...
Microwave irradiation of phthalic anhydride and hydroxylamine hydrochloride in pyridine produces N-hydroxyphthalimide in 81% ... Three possibilities were discussed and are shown in the Figure below: a mono-oxime of phthalic anhydride ("phthaloxime", I), an ... The oximes of opianic acid and of phthalic anhydride". J. Chem. Soc.: 529-539. doi:10.1039/JR9280000529. Hurd, Charles D.; ... Even in the absenceof a base, phthalic anhydride and hydroxylamine phosphate react to produce N-hydroxyphthalimide in 86% yield ...
... can be synthesized from thymol and phthalic anhydride. Phenolphthalein "Thymolphthalein". pubchem.ncbi.nlm.nih. ...
Unlike resorcinol it does not give a fluorescein with phthalic anhydride. Oxidation of the ammoniacal solution gives orcein, ...
Phthalates Dibutyl phthalate Phthalic anhydride Isobutanol Schettler, Ted (2006-02-07). "Human exposure to phthalates via ... It is formed by the esterification of isobutanol and phthalic anhydride. This and other phthalates are used as plasticizers due ... In 1836 French chemist Auguste Laurent oxidized naphthalene with chromic acid and created phthalic anhydride, of which ... Synthesis of phthalate esters via FeCl3-catalyzed nucleophilic addition of alcohols to phthalic anhydride". Results in ...
... upon reaction with phthalic anhydride, to quinizarin. The commercial dye quinizarin is produced by the reaction of phthalic ... anhydride and 4-chlorophenol followed by hydrolysis of the chloride. Haynes, p. 3.116 Haynes, p. 5.90 Haynes, p. 3.577 Haynes, ...
DBP is produced by the reaction of n-butanol with phthalic anhydride. DBP is an important plasticizer that enhances the utility ... Phthalic acid Phthalates Diisobutyl phthalate (DIBP) Nail polish NIOSH Pocket Guide to Chemical Hazards. "#0187". National ... Dibutyl phthalate (DBP) is one of the six phthalic acid esters found on the Priority Pollutant List, which consists of ... Hydrolysis of DBP leads to phthalic acid and 1-butanol. Monobutyl phthalate (MBP) is its major metabolite. Biodegradation by ...
It is an isomer of 3-chlorophthalic anhydride and a derivative of phthalic anhydride. It has a melting point of around 99 °C. ... Like most acid anhydrides, it can hydrolyze in the presence of water. It can be produced by chlorination of phthalic anhydride ... Chlorination of phthalic anhydride http://www.freepatentsonline.com/4297283.html (Articles without EBI source, Articles without ... 4-Chlorophthalic anhydride is a monochlorinated aromatic anhydride. ...
The useful dye quinizarin is produced by diacylation of hydroquinone with phthalic anhydride. Hydroquinone undergoes oxidation ...
... is manufactured commercially via the esterification of phthalic anhydride with methanol. The reaction can be ... US 5534652, Jones L, Daniels PH, Krauskopf LG, Rigopoulos KR, "Preparation of plasticizer esters from phthalic anhydride ... MMP may also be further hydrolysed to phthalic acid. However, low molecular weight phthalates such as MMP are primarily ... Huang, Ling; Zhu, Xunzhi; Zhou, Shixing; Cheng, Zhenrui; Shi, Kai; Zhang, Chi; Shao, Hua (July 2021). "Phthalic Acid Esters: ...
The Friedel-Crafts reaction of benzene and phthalic anhydride in presence of AlCl3. o-Benzoylbenzoic acid is an intermediate. ...
Naphthalene is a precursor in the production of phthalic anhydride. This application has been displaced by alternative ...
It is an isomer of 4-chlorophthalic anhydride and a derivative of phthalic anhydride. 3-Chlorophthalic anhydride has a melting ... 3-Chlorophthalic anhydride may be used to produce herbicides and pesticides, intermediates for active pharmaceutical ... 4-Chlorophthalic anhydride Preparation of 3-chlorophthalic anhydride http://www.freepatentsonline.com/5683553.html (Articles ... 3-Chlorophthalic anhydride is a monochlorinated aromatic anhydride. ...
Phthalic anhydride production shifts from catalytic oxidation of naphthalene to the o-xylol process. Catalytic upgrading of gas ...
... phthalic anhydride, and phthalimides. Alternatively, heating phthalic anhydride in the presence of urea yields H2Pc. Using such ... Phthalocyanine is formed through the cyclotetramerization of various phthalic acid derivatives including phthalonitrile, ... On the products of the reaction of acetic anhydride with phthalamide]. Berichte der Deutschen Chemischen Gesellschaft (in ...
... is produced by the catalytic oxidation of naphthalene or ortho-xylene directly to phthalic anhydride and a ... P1 degrades phthalic acid. Isophthalic acid Phthalate Phthalic anhydride Potassium hydrogen phthalate, a primary standard for ... Typically phthalate esters are prepared from the widely available phthalic anhydride. Reduction of phthalic acid with sodium ... Although phthalic acid is of modest commercial importance, the closely related derivative phthalic anhydride is a commodity ...
Upon treatment with phthalic anhydride derivatives, the diamine converts to phthaloperinones. The derivative from phthalic ... anhydride itself, Solvent Orange 60, is a useful orange pigment. It is a precursor to 1,8-bis(dimethylamino)naphthalene. This ...
... are produced industrially by the acid catalysed reaction of phthalic anhydride with excess alcohol. The synthesis of ... as well as alternative plasticizers not based on phthalic anhydride. The legacy use of phthalate plasticizers has prevented ... odorless liquids produced by reacting phthalic anhydride with an appropriate alcohol (usually 6- to 13-carbon). The mechanism ... Bi M, Liu W, Luan X, Li M, Liu M, Liu W, Cui Z (October 2021). "Production, Use, and Fate of Phthalic Acid Esters for Polyvinyl ...
The compound is produced by the reaction of phthalic anhydride and toluene. It can be chlorinated to give 1-chloro-2- ...
They are formed by the reaction of phthalic anhydride with various phenols. They are a subclass of triarylmethane dyes. Common ...
Phthalic anhydride is poorly reactive toward bromine, necessitating the use of acidic media. The Gatterman reaction can also be ... The main aryl bromides produced commercially are tetrabromophthalic anhydride, decabromodiphenyl ether, and tetrabromobisphenol ...
... can be synthesized by condensation of phthalic anhydride with two equivalents of phenol under acidic conditions ...
... the oxidation of o-xylene for the production of phthalic anhydride (Quinta Ferreira et al., 1999)." "Among the several ...
In 1871 he discovered the synthesis of phenolphthalein by condensation of phthalic anhydride with two equivalents of phenol ... as he had synthesised it from phthalic anhydride and resorcinol. The term fluorescein would not start to be used until 1878. In ...
Many xanthene dyes can be prepared by condensation of derivates of phthalic anhydride with derivates of resorcinol or 3- ...
Parallels exist with the production of phthalic anhydride: While older methods use naphthalene, modern methods use o-xylene as ... Maleic anhydride is also a skin and respiratory sensitizer. Maleic anhydride is a low hazard profile chemical. Maleic anhydride ... Maleic anhydride is an organic compound with the formula C2H2(CO)2O. It is the acid anhydride of maleic acid. It is a colorless ... Maleic anhydride is used in many applications. Around 50% of world maleic anhydride output is used in the manufacture of ...
It is the anhydride of phthalic acid. Phthalic anhydride is a principal commercial form of phthalic acid. It was the first ... Phthalic acid is however easily dehydrated to form phthalic anhydride. Above 180 °C, phthalic anhydride re-forms. Chiral ... Phthalic anhydride is a degradation product of CAP. Phthalic anhydride is a versatile intermediate in organic chemistry, in ... Studies show that exposure to phthalic anhydride can cause rhinitis, chronic bronchitis, and asthma. Phthalic anhydrides ...
... and phthalic anhydride in various solid forms, and as liquids at elevated temperatures in a safe manner that represents and ... and Phthalic Anhydride. Standard Practice for Sampling and Handling Naphthalene, Maleic Anhydride, and Phthalic Anhydride D3438 ... and Phthalic Anhydride Standard D3438 Standard Practice for Sampling and Handling Naphthalene, Maleic Anhydride, and Phthalic ... 1.1 This practice covers procedures for sampling and handling naphthalene, maleic anhydride, and phthalic anhydride in various ...
... phthalic anhydride was $69,197.70K and quantity 63,289,100Kg.. Germany imported Acids; aromatic polycarboxylic acids; phthalic ... phthalic anhydride. 2021. Sweden. 733.59. 722,853. Kg. Germany. Import. 291735. Acids; aromatic polycarboxylic acids; phthalic ... phthalic anhydride. 2021. Turkey. 106.75. 168,001. Kg. Germany. Import. 291735. Acids; aromatic polycarboxylic acids; phthalic ... phthalic anhydride. 2021. Israel. 33.75. 27,245. Kg. Germany. Import. 291735. Acids; aromatic polycarboxylic acids; phthalic ...
Wholesale Trader of Phthalic Anhydride offered by S P Chem India, Ahmedabad, Gujarat. ... Phthalic anhydride is the organic compound with the formula C H CO O. It is the anhydride of phthalic acid. Phthalic anhydride ... is a principal commercial form of phthalic acid.. Terms & Condition:-. *Taxes :- 18% GST Extra ... Phthalic Anhydride. Offering you a complete choice of products which include phthalic anhydride. ...
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Our phthalic anhydride uses including plasticiers, unsaturated polyester resins, alkyd resins, dye intermediates, pharmaceutial ... Douwin is dedicated to delivering high quality phthalic anhydride applications for all walks of business. ... Wide Applications of Phthalic Anhydride. Phthalic anhydride is an important industrial chemical. Due to phthalic anhydride ... As a professional phthalic anhydride supplier, Douwin Chemical has high quality phthalic anhydride for sale. Our phthalic ...
Getting error while fetching data of phthalic anhydride from JSON file. -. 12. 10-07-2021 11:26:55. Error. MSTR-01: Error ...
We offer customized state-of-the-art phthalic anhydride process technology & provide technical and commercial support at all ... Phthalic anhydride is a white crystalline solid used as an intermediate in the production of phthalate plasticisers, ... Technobells technology for the production of phthalic anhydride is based on the selective oxidation of o-xylene, resulting in ... Most of the worlds consumption of phthalic anhydride is in molten form. ...
Supplier and Distributor of Phthalic Anhydride , PA , Europe , Asia ... Phthalic Anhydride (PA). CAS: 85-44-9. Phthalic Anhydride is a white solid flakes or molten liquid with the molecular formula C ... Phthalic Anhydride is obtained by catalytic reforming of ortho-Xylene or naphtalene. ... Arpadis is handling the storage, transport, export & import formalities of Phthalic Anhydride globally. ...
Starting raw material for the manufacture of Maleic anhydride is P.T.F.E. (Poly tetra fluoro ethylene) is commercially known as ...
Home/Phthalic Anhydride Market Trend. Phthalic Anhydride Market Trend. * Business. WilliambdAugust 4, 2022. 0 100 ... The Phthalic Anhydride market research 2022-2030 offers substantial authentic information for Phthalic Anhydride, allowing the ... Europe Phthalic Anhydride Market value was Estimated to be $1,141 mn in 2021, to Grow at a CAGR of about 3% from 2021 to 2028. ...
... United Arab Emirates MT Importer of Product ... PHTHALIC ANHYDRIDE. TO ORDER. RA******ION. #N/A. 28-05-2019. PHTHALIC ANHYDRIDE. PERFECT POLYMERS FZLLC PO BOX6577 AL JAZEERA ... PHTHALIC ANHYDRIDE. HITECH INDUSTRIES FZE. PO******LTD. KOREA (SOUTH). 16-07-2019. PHTHALIC ANHYDRIDE. HITECH INDUSTRIES FZE. ... PHTHALIC ANHYDRIDE. SCOTT BADER MIDDLE EAST LTD. DA******ION. KOREA (SOUTH) 30-12-2019. PHTHALIC ANHYDRIDE. M/S POLYCHEM RESINS ...
At present, the company is mainly engaged in the production and sales of phthalic anhydride and plasticizer and the import and ... At present, the company is mainly engaged in the production and sales of phthalic anhydride and plasticizer and the import and ... The main plasticizer products are: phthalic acid esters, citric acid esters, aliphatic dicarboxylic acid esters, etc. The ...
Key chemical intermediate phthalic anhydride has always come from petrochemical sources. This could change if one Dutch startup ... Biobased phthalic anhydride: Can this key feedstock be green?. February 13, 2023 Jane Denny ... Phthalic anhydride is a key chemical intermediate in applications from phthalate plasticisers to polyesters. Many types of ... Not only does Relements bio-MPA (3-methyl phthalic anhydride) replace the fossil ingredient PA in coatings, the Dutch startup ...
Flakes ສີຂາວໃຊ້ ສຳ ລັບອຸດສາຫະ ກຳ ທາສີ 85-44-9 Phthalic Anhydride PA. ...
Phthalic Anhydride Imports, Prices, Trends, Analysis, India List. ... Get Indias Best Monthly Advisories and Forecast on Phthalic ...
Phthalic anhydride. 85-44-9. 60 mg/m3. Picric acid. 88-89-1. 75 mg/m3. ...
Wanted: Phthalic Anhydride. Jul 12, 2023 . We required Phthalic Anhydride on a regular basis. CIF Nhava Sheva /Chennai basis ... Wanted: Maleic Anhydride. Jul 12, 2023 . We required Maleic Anhydride on a regular basis. CIF Nhava Sheva /Chennai basis for ...
Whether youre looking for Premium Grade 3-(2,4-Dimethyl-3-Pentyloxy)Phthalonitrile, Phthalic Anhydride, 3-Nitro Phthalonitrile ...
The hydroxyl groups are esterified by phthalic anhydride in pyridine solution. The excess of phthalic anhydride is hydrolyzed ... Non-ionic surface active agents - Polyalkoxylated derivatives - Determination of hydroxyl value - Phthalic anhydride method. ... The acidity which appears during the esterification and of the phthalic acid formed during the hydrolysis is neutralized by ...
BUTYL ACETATE, ETHYL ACETATE, NITROCELLULOSE, PHTHALIC ANHYDRIDE / TRIMELLITIC ANHYDRIDE / GLYCOLS COPOLYMER, ACETYL TRIBUTYL ... CITRATE, ISOPROPYL ALCOHOL, STEARALKONIUM HECTORITE, ADIPIC ACID / FUMARIC ACID / PHTHALIC ACID / TRICYCLODECANE DIMETHANOL ...
Phthalic anhydride for industrial use - Methods of test - Part 11: Determination of iron content - 2,2- Bipyridyl photometric ... Phthalic anhydride for industrial use - Methods of test - Part 11: Determination of iron content - 2,2- Bipyridyl photometric ...
Divergent immune responses to respiratory and contact chemical allergens: Antibody elicited by phthalic anhydride and oxazolone ... Antibody elicited by phthalic anhydride and oxazolone. Together they form a unique fingerprint. ...
Low molecular weight chemicals, such as isocyanates (eg, in spray paint and glue), phthalic anhydride (in epoxy resin), and ...
Reaction products of γ-butyrolactone, naphthalene-1,6-diol and phthalic anhydride. ...
Hexahydrophthalic-Anhydride; HHPA; Phthalic Anhydride; Allergy IgE Antibodies; Radioallergosorbent-Technique ... test for an anhydride specific immunoglobulin-E (IgE) antibody were conducted. Anhydride concentrations of 0.1 to 1.3 part per ... Seven workers showed the presence of an anhydride specific IgE antibody. The authors conclude that workers at the facility are ... Area and breathing zone concentrations were analyzed for hexahydrophthalic-anhydride (85427), 1,1,1-trichloroethane (71556), ...
Phthalic Anhydride. Phthalocyanine. Picaridin. Pigment Blue 15. Pigment Blue 15:3. Pigment Green 7. Pine Resin. Piperonyl ... Maleic anhydride. Malic Acid. Menthoxypropanediol. Menthyl Lactate. Meperfluthrin. Methanol. Methenamine. Methoxyisopropanol. ... Isobutylene-Maleic Anhydride Polymer Ammonium Salt. Isodecyl Oleate. Isohexadecane. Isolaureth-10. Isoparaffin. Isopentane. ...
Maleic Anhydride • 1,4-Butanediol & Derivatives. *Orthoxylene • Phthalic Anhydride. *Phenol • Acetone & Derivatives ...
Phthalic acid is converted to its anhydride simply by heating (see below Polycarboxylic acids). Phthalic anhydride is used to ... carboxylic acid: Aromatic acids: are called phthalic, isophthalic, and terephthalic acid, for the ortho, meta, and para isomers ...
Deactivation of V2O5/TiO2 catalysts in the oxidantion of o-xylene to phthalic anhydride. 著者名:. *Dias, C. R. ... 国際会議録 Partial oxidation of o-xylene to phthalic anhydride in a structured fixed bed containing a sequence of catalysts ... 国際会議録 Effect of catalyst deactivation on the process of oxidation of o-xylene to phthalic anhydride in an industrial ... 国際会議録 Effect of thermal deactivation of vanadium - titanium catalyst on o-xylene oxidation process yielding phthalic anhydride
  • About 10% of maleic anhydride is also produced: C6H4(CH3)2 + 7+1/2 O2 → C4H2O3 + 4 H2O + 4 CO2 Phthalic anhydride and maleic anhydride are recovered by distillation by a series of switch condensers. (wikipedia.org)
  • 1.1 This practice covers procedures for sampling and handling naphthalene, maleic anhydride, and phthalic anhydride in various solid forms, and as liquids at elevated temperatures in a safe manner that represents and preserves quality. (astm.org)
  • What is not mentioned is that the 2-methylfuran has to be reacted with maleic anhydride (MA) to make this product. (resourcewise.com)
  • We required Maleic Anhydride on a regular basis. (ecplaza.net)
  • Maleic anhydride is an important intermediary in the manufacture of unsaturated polyester resins and the production increases by several per cent annually. (europa.eu)
  • The fuel contained pulverized phthalic anhydride and anhydrous maleic anhydride, two substances that have been documented as linked to asthma. (concentra.com)
  • In the mid-1970s a maleic anhydride unit was constructed and isophthalic acid production was campaigned in the oxidation unit. (ineos.com)
  • In the chemical industry, high-purity vanadium oxide is used to produce catalysts for the synthesis of phthalic and maleic anhydrides. (rudmet.ru)
  • After gas chromatography and mass spectrometry (GC-MS) and pyrolysis gas chromatography and mass spectrometry (Py-GC-MS) analysis, it indicates that the possible volatiles and pyrolysis products in FAS are fumaric acid, maleic acid, maleic anhydride, phthalic acid, etc. (bvsalud.org)
  • In the test of Liquid chromatography and mass spectrometry (LC-MS), we determined the contents of phthalic acid, fumaric acid, and maleic acid in FAS. (bvsalud.org)
  • A dedicated trimellitic anhydride unit started operation in 1969. (ineos.com)
  • The naphthalene route (the Gibbs phthalic anhydride process or the Gibbs-Wohl naphthalene oxidation reaction) has declined relative to the o-xylene route. (wikipedia.org)
  • Technobell's technology for the production of phthalic anhydride is based on the selective oxidation of o-xylene , resulting in improved plant design. (technobell.eu)
  • The expected development should be transferable to other selective oxidation reactions such as the production of phthalic anhydride and acrylonitrile. (europa.eu)
  • Amoco began development in 1957 with oxidation processes to produce dimethyl terephthalate and phthalic anhydride. (ineos.com)
  • It is the anhydride of phthalic acid. (wikipedia.org)
  • Phthalic anhydride is a principal commercial form of phthalic acid. (wikipedia.org)
  • It was the first anhydride of a dicarboxylic acid to be used commercially. (wikipedia.org)
  • Phthalic anhydride can also be prepared from phthalic acid by simple thermal dehydration above 210°C. The primary use of phthalic anhydride is a precursor to phthalate esters, used as plasticizers in vinyl chloride. (wikipedia.org)
  • Hydrolysis by hot water forms ortho-phthalic acid: C6H4(CO)2O + H2O → C6H4(CO2H)2 Hydrolysis of anhydrides is not typically a reversible process. (wikipedia.org)
  • Phthalic acid is however easily dehydrated to form phthalic anhydride. (wikipedia.org)
  • A related ring-opening reaction involves peroxides to give the useful peroxy acid: C6H4(CO)2O + H2O2 → C6H4(CO3H)CO2H Phthalimide can be prepared by heating phthalic anhydride with aqueous ammonia giving a 95-97% yield. (wikipedia.org)
  • Phthalic anhydride is the organic compound with the formula C H CO O. It is the anhydride of phthalic acid. (spcheminc.com)
  • Phthalic Anhydride is a white solid flakes or molten liquid with the molecular formula C 8 H 4 O 3 .It's the principal form of phthalic acid and important industrial chemical of plasticizers for plastics. (arpadis.com)
  • The main plasticizer products are: phthalic acid esters, citric acid esters, aliphatic dicarboxylic acid esters, etc. (kfjhchem.net)
  • The acidity which appears during the esterification and of the phthalic acid formed during the hydrolysis is neutralized by sodium hydroxide solution in the presence of phenolphthalein as indicator. (iso.org)
  • Di -n- octylphthalate is produced at atmospheric pressure or in a vacuum by heating an excess of n-octanol with phthalic anhydride in the presence of an esterification catalyst such as sulfuric acid or p-toluenesulfonic acid. (cdc.gov)
  • Providing you the best range of n n dimethylformamide dmf cas 68 12.2, acrylic acid cas 79 10 7, liquid mix xylene, methyl ethyl ketone and phthalic anhydride powder with effective & timely delivery. (veerachemical.com)
  • Phthalic anhydride is a versatile intermediate in organic chemistry, in part because it is bifunctional and cheaply available. (wikipedia.org)
  • The process begins with the reaction of phthalic anhydride with alcohols, giving the monoesters: C6H4(CO)2O + ROH → C6H4(CO2H)CO2R The second esterification is more difficult and requires removal of water: C6H4(CO2H)CO2R + ROH ⇌ C6H4(CO2R)2 + H2O The most important diester is bis(2-ethylhexyl) phthalate ("DEHP"), used in the manufacture of polyvinyl chloride compounds. (wikipedia.org)
  • Phthalic anhydride is used to dehydrate short-chain nitro-alcohols to yield nitroalkenes, compounds with a high tendency to polymerize. (wikipedia.org)
  • Phthalic anhydride is a white organic compound with a pungent odor, which is soluble in water, alcohols and other organic solvents. (douwin-chem.com)
  • Phthalic anhydride should be stored in sealed containers in a cool and dry place and kept away from water, acids, strong oxidizing agents, alcohols and amines. (douwin-chem.com)
  • Twenty seven employees were interviewed and pulmonary function tests, blood counts, and the radioallergosorbent technique (RAST) test for an anhydride specific immunoglobulin-E (IgE) antibody were conducted. (cdc.gov)
  • Seven workers showed the presence of an anhydride specific IgE antibody. (cdc.gov)
  • Not only does Relement's bio-MPA (3-methyl phthalic anhydride) replace the fossil ingredient PA in coatings, the Dutch startup says its product increases coatings hardness - making it potentially longer-lasting than its petrochemical counterpart. (resourcewise.com)
  • Phthalic anhydride is used as a raw material for DBP and DOP plasticizers, and is also used to make dyes. (douwin-chem.com)
  • Phthalic anhydride (PA) is often used to make unsaturated polyester resins (UPR), which are used in industries such as electronics and construction automotive parts. (douwin-chem.com)
  • Phthalic anhydride is a white crystalline solid used as an intermediate in the production of phthalate plasticisers, unsaturated polyester resins and alkyd resins for surface coatings. (technobell.eu)
  • Often, these use saccharin (a suspected carcinogen) and phthalic anhydride (made from another suspected carcinogen, naphthalene), an irritant which can cause headaches, nausea, vomiting, diarrhoea and confusion. (healthy.net)
  • Most of the world's consumption of phthalic anhydride is in molten form. (technobell.eu)
  • Since there are currently no commercial biobased phthalic anhydride (PA) products available, a non-fossil aromatic could prove a gamechanger. (resourcewise.com)
  • Offering you a complete choice of products which include phthalic anhydride. (spcheminc.com)
  • The uses of phthalic anhydride not only include dyes, agricultural products, but also include pharmaceuticals and other chemical products. (douwin-chem.com)
  • At present, the company is mainly engaged in the production and sales of phthalic anhydride and plasticizer and the import and export business of related chemical products and technologies. (kfjhchem.net)
  • Whether you're looking for Premium Grade 3-(2,4-Dimethyl-3-Pentyloxy)Phthalonitrile, Phthalic Anhydride, 3-Nitro Phthalonitrile etc, you can explore and find the best products from Tradeindia. (tradeindia.com)
  • Asian Paints has diversified into chemical products such as Phthalic Anhydride and Pentaerythritol, which are used in the paint manufacturing process. (ndtv.com)
  • Phthalate esters are derived from phthalic anhydride by the alcoholysis reaction. (wikipedia.org)
  • In the 1980s, approximately 6.5 million tonnes of these esters were produced annually, and the scale of production was increasing each year, all from phthalic anhydride. (wikipedia.org)
  • Phthalic anhydride is the organic compound with the formula C6H4(CO)2O. (wikipedia.org)
  • Phthalic anhydride's reaction on human health is generally an asthma-rhinitis-conjunctivitis syndrome or a delayed reaction and influenza-like symptoms and with increased immunoglobulin (E and G) levels in the blood. (wikipedia.org)
  • Di -n- octylphthalate can also be produced by the reaction of n-octylbromide with phthalic anhydride. (cdc.gov)
  • Phthalic anhydride is widely used in industry for the production of certain dyes. (wikipedia.org)
  • Phthalic anhydride treated with cellulose acetate gives cellulose acetate phthalate (CAP), a common enteric coating excipient that has also been shown to have antiviral activity. (wikipedia.org)
  • Phthalic anhydride is a key chemical intermediate in applications from phthalate plasticisers to polyesters. (resourcewise.com)
  • The excess of phthalic anhydride is hydrolyzed with water containing in the sodium hydroxide solution used for the neutralization. (iso.org)
  • As a professional phthalic anhydride supplier , Douwin Chemical has high quality phthalic anhydride for sale. (douwin-chem.com)
  • Douwin is a professional phthalic anhydride supplier and manufacturer. (douwin-chem.com)
  • The most probable human exposure to phthalic anhydride is through skin contact or inhalation during manufacture or use. (wikipedia.org)
  • Getting error while fetching data of phthalic anhydride from JSON file. (fossee.in)
  • Arpadis is handling the storage, transport, export & import formalities of Phthalic Anhydride globally. (arpadis.com)
  • Due to phthalic anhydride properties, it has a very wide range of applications. (douwin-chem.com)
  • We know deeply about the uses of phthalic anhydride and produce high-quality phthalic anhydride. (douwin-chem.com)
  • It's made in a laboratory by oxidizing the chemicals o-toluene sulfonamide or phthalic anhydride. (healthline.com)
  • Phthalic anhydride is irritating to the skin and eyes and may cause allergic dermatitis or damage to the cornea and conjunctiva. (douwin-chem.com)
  • The hydroxyl groups are esterified by phthalic anhydride in pyridine solution. (iso.org)