A 0.4 wt%Pt/Ce0.76Zr0.19Zn0.05O1.95 catalyst was prepared by the evaporative drying method. The catalytic toluene oxidation activity of the catalyst was investigated and the calcination temperature dependence on the toluene oxidation activity was characterized. It was confirmed that only CO2 and steam were produced by the complete oxidation of toluene, and no toluene-derived compounds were detected as by-products with a gas chromatography-mass spectrometer. Toluene was completely oxidized at 320 °C on the 0.4 wt%Pt/Ce0.76Zr0.19Zn0.05O1.95 catalyst calcined at 500 °C. The toluene oxidation activity slightly decreased with increasing the calcination temperature of the catalyst. However, significant deactivation was not recognized in the present 0.4 wt%Pt/Ce0.76Zr0.19Zn0.05O1.95 catalyst, and toluene was completely oxidized at 360 °C even after calcination at 1000 °C. From these results, it became obvious that the 0.4 wt%Pt/Ce0.76Zr0.19Zn0.05O1.95 catalyst has high thermal stability for toluene
Ong, C.N.,Foo, S.C.,Lee, B.L. (1994). Effect of fasting on toluene metabolism: A study of hippuric acid and O- cresol excretion. Applied Occupational and Environmental Hygiene 9 (9) : 622-625. ScholarBank@NUS Repository ...
The aim of this study was designed to investigate the possible beneficial effects of Nigella sativa (NS) and derived thymoquinone (TQ) on neurodegeneration in hippocampus after chronic toluene exposure in rats. The rats were randomly allotted into one of four experimental groups: A (control), B (toluene treated), C (toluene treated with NS) and D (toluene treated with TQ); each group contain 10 animals. Toluene treatment was performed by inhalation of 3,000 ppm toluene, in a 8 h/day and 6 day/week order for 12 weeks. Control group received 1 ml serum physiologic and the rats in NS and TQ treated groups (C and D) were given NS (in a dose of 400 mg/kg body weight) and TQ (50 mg/kg body weight) once a day orally by using intra gastric intubation for 12 weeks starting just after toluene exposure respectively. Tissue samples were obtained for histopathological investigation. To date, no histopathological changes of neurodegeneration in hippocampus after chronic toluene exposure in rats by NS and TQ ...
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The solubility of ammonia in toluene has been measured at 398 K and at pressures up to 340 kPa using a static, synthetic and isochoric technique. The goal of the present study is to determine the equilibrium solubility of ammonia in toluene at a pressure and temperature regime that is relevant to the reaction conditions of amination of 1,3,5-trichloro-2,4,6-trinitrobenzene leading to the formation of 1,3,5-triamino-2,4,6-trinitro benzene. The ammonia solubility data in toluene were hitherto unavailable under these experimental conditions. The solubility data have also been compared with the result obtained from a direct sampling method. The results are in agreement with Krichevsky-Kasarnovsky equation. The Henrys law constant at the reaction temperature has been determined ...
A novel bead-pack micromodel has been developed to observe directly with videomicroscopy movement and distribution of toluene in the subsurface, including effects of water infiltration, variations in the water table, and alcohol-water flushing. If the medium was initially partially water-saturated, toluene spread downward along air-water interfaces, leaving behind very low residual saturation. It did not penetrate low-permeable strata that were water-saturated. If the medium was initially dry, toluene saturated only a small area where it was injected. Water infiltration displaced such toluene downward, ultimately trapping it as ganglia. Subsequent water drainage exposed some ganglia to air, allowing toluene to spread downward. Other ganglia in regions of low permeability remained trapped. Limited upward displacement of toluene occurred with the raising of the water table. However, the toluene was eventually trapped. Enhanced solubilization and mobilization of toluene were observed with a ...
Benzene and toluene mixing ratios were measured in the indoor air of homes with attached garages for several seasons using a thermal desorption GC-FID sampling and analysis protocol (EPA T0-17). Benzene in the living area of these homes ranged from 1--72 ppbv and toluene ranged 3--111 ppbv. The garage levels of benzene ranged from 8--304 pbbv and the toluene levels ranged from 14--591 ppbv. Numerous experiments and a model support the hypothesis of a single source of toluene and benzene. Source strength estimate calculations supported the hypothesis that gasoline in the attached garage is the primary source of these compounds in living area air. They also showed that the home with the air-to-air heat exchangers and forced ventilation had less transport of aromatics than an unventilated home. Perturbation experiments showed that a metal gas can filled with gasoline in the garage and an indoor window open were important factors for benzene and toluene levels in the living areas of the homes. For ...
A semidetailed mechanism (137 species and 633 reactions) and new experiments in a homogeneous charge conic pression ignition (HCCI) engine on the autoignition of toluene reference fuels are presented. Skeletal mechanisms for isooctane and n-heptane were added to a detailed toluene submechanism. The model shows generally good agreement with ignition delay times measured in a shock tube and a rapid compression machine and is sensitive to changes in temperature, pressure, and mixture strength. The addition of reactions involving the formation and destruction of benzylperoxide radical was crucial to modeling toluene shock tube data. Laminar burning velocities for benzene and toluene were well predicted by the model after some revision of the high-temperature chemistry. Moreover, laminar burning velocities of a real gasoline at 353 and 500 K Could be predicted by the model using a toluene reference fuel as a surrogate. The model also captures the experimentally observed differences in combustion ...
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This study examined the effects of ethanol (EtOH) and toluene on fixed-ratio (FR) responding in mice selectively bred for sensitivity to the effects of EtOH on sleep time. Although the more sensitive long sleep (LS) mice showed greater EtOH-induced impairment in a motor performance task than did the less sensitive short sleep (SS) mice, changes in FR performance in the two
5.1 Exposure data. Toluene is an industrial chemical produced in high volume, that is used in blending gasoline and as a solvent. Occupational exposure to toluene is extensive and occurs in its production and during the manufacture and use of toluene-containing paints, thinners, cleaning agents, coatings and adhesives. It is commonly detected in ambient air and at low levels in water.. 5.2 Human carcinogenicity data. Toluene was mentioned as an exposure in eight studies. Two were community-based case control studies, one of which involved brain cancer and one involved several types of cancer. Of the six industry-based studies, three were analysed as cohort studies and three were configured as nested case control studies of one or a few types of cancer. In two of the studies, that of shoe-manufacturing workers in the United States and particularly that of Swedish rotogravure printers, it was believed that toluene was the predominant exposure; in the other studies, there were probably concomitant ...
In order to reduce exposure to toxic chemicals, the European REACH regulation (1907/2006) recommends substituting toxic molecules with compounds that are less harmful to human health and the environment. Toluene is one of the most frequently used solvents in industries despite its toxicity. The objective of this study is to better understand and compare the toxicity of toluene and its homologues in a bronchial cell model. Thus, human bronchial BEAS-2B cells were exposed to steams of toluene, m-xylene, mesitylene (1,3,5-trimethylbenzene), and benzene (20 and 100 ppm). Exposure was carried out using an air-liquid interface (ALI) system (Vitrocell) during 1 h/ day for 1, 3, or 5 days. Cytotoxicity, xenobiotic metabolism enzyme gene expression, and inflammatory response were evaluated following cell exposures. BEAS-2B cell exposure to toluene and its homologues revealed the involvement of major (CYP2E1) and minor metabolic pathways (CYP1A1). A late induction of genes (EPHX1, DHDH, ALDH2, and ...
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TY - JOUR. T1 - The prevalence of surface oxygen vacancies over the mobility of bulk oxygen in nanostructured ceria for the total toluene oxidation. AU - López, Jose Manuel. AU - Gilbank, Alexander L.. AU - García, Tomás. AU - Solsona, Benjamín. AU - Agouram, Said. AU - Torrente-Murciano, Laura. PY - 2015/9/1. Y1 - 2015/9/1. N2 - This paper reveals the key importance of surface oxygen defects in the oxidation catalytic activity of nanostructured ceria. A series of nanostructured rods and cubes with different physico-chemical properties have been synthesized, characterized and tested in the total toluene oxidation. The variation of the temperature and base concentration during the hydrothermal syntheses of nanostructured ceria leads not only to different ceria morphologies with high shape purity, but also to structures with tuneable surface areas and defect concentrations. Ceria nanorods present a higher surface area and a higher concentration of bulk and surface defects than nanocubes ...
OSHA comments from the January 19, 1989 Final Rule on Air Contaminants Project extracted from 54FR2332 et. seq. This rule was remanded by the U.S. Circuit Court of Appeals and the limits are not currently in force.. CAS: 108-88-3; Chemical Formula: C6H5CH3. The former OSHA standard for toluene was 200 ppm as an 8-hour TWA limit, with a 300-ppm ceiling (not to be exceeded for more than 10 minutes in any eight-hour period), and a 500-ppm peak. The ACGIH has an exposure limit for toluene of 100 ppm as an 8-hour TWA and 150 ppm as a 15-minute STEL; NIOSH recommends a 100-ppm 8-hour TWA and a 10-minute ceiling of 200 ppm. The proposed PELs were 100 ppm as an 8-hour TWA and 150 ppm as a STEL; NIOSH (Ex. 8-47, Table N1) concurs with these limits, which are established in the final rule. Toluene is a flammable, colorless liquid with an aromatic hydrocarbon odor.. The acute toxicity of toluene in animals is greater than that of benzene. Patty (1963b, as cited in ACGIH 1986/Ex. 1-3, p. 578) reports that ...
|p| The injection of a mixed toluene and D |sub|2|/sub| O (conservative tracer) pulse into a pristine mesoscale aquifer enabled a first direct experimental comparison of contaminant-specific isotopic fractionation from sorption versus biodegradation and transverse dispersion on a relevant scale. Water samples were taken from two vertically resolved sampling ports at 4.2 m distance. Analysis of deuterium and toluene concentrations allowed quantifying the extent of sorption (R = 1.25) and biodegradation (37% and 44% of initial toluene at the two sampling ports). Sorption and biodegradation were found to directly affect toluene |sup|13|/sup| C/ |sup|12|/sup| C breakthrough curves. In particular, isotope trends demonstrated that biodegradation underwent Michaelis-Menten kinetics rather than first-order kinetics.
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Biological monitoring tests were conducted in humans experimentally exposed to methyl-ethyl-ketone (78933) (MEK) and toluene (108883), both alone and in combination, by inhalation. Subjects were exposed in a 2 cubic meter exposure chamber for 4 hours to 200 parts per million (ppm) MEK (20 subjects), 100ppm toluene (30 subjects), 100ppm MEK plus 50ppm toluene (16 subjects) or, as a positive control
It is flammable at temperatures greater than 40�F (4.4�C); therefore, it is a significant fire hazard at room temperature. Toluene mixes readily with many organic solvents, but is poorly soluble in water. Toluene is less dense than water and will float on the surface of water. Toluene should be stored indoors in a standard flammable liquids room or cabinet that is separate from oxidizing materials. Synonyms include methyl benzene, methyl benzol, phenyl methane, and toluol. Toluene is a clear, colorless, volatile liquid with a sweet, pungent, benzene-like odor.
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A simple deep-ultraviolet (UV) absorption spectrophotometer based on ultraviolet light-emitting diode (UV LED) was developed for the detection of air-borne toluene with a good sensitivity. A fiber-coupled deep UV-LED was employed as a light source, and a spectrometer was used as a detector with a gas cell in between. 3D printed opto-fluidics connectors were designed to integrate the gas flow with UV light. Two types of hollow core waveguides (HCW) were tested as gas cells: a glass capillary tube with aluminum-coated inner walls and an aluminum capillary tube. The setup was tested for different toluene concentrations (10-100 ppm), and a linear relationship was observed with sensitivities of 0.20 mA U/ppm and 0.32 mA U/ppm for the glass and aluminum HCWs, respectively. The corresponding limits of detection were found to be 8.1 ppm and 12.4 ppm, ...
The chemical reactions of toluene and oxygen in a 50 Hz ac discharge have been studied in a capacitive coupled discharge reactor. The variables investigated were partial pressure of the reactants, reactor pressure, reactor temperature, reactant ratios, applied reactor voltage, discharge current,capacitive current, breakdown voltage, and the phase shift. The thermal reaction was negligible at temperatures below 300 °C. The major products of the reaction between toluene and oxygen were benzaldehyde, o-cresol, benzene, m+p-cresol, phenol and benzyl alcohol. The reaction was controlled by the electric field and the total reactor pressure. The threshold energy for the chemical reaction was found to be about 10 eV. The reaction was found to be of first order with respect to oxygen. The effect of the electric field was correlated by the parameter E/N. The selectivity of benzene was mainly determined by the ratio of toluene to oxygen. Cresol, benzaldehyde, benzyl alcohol and phenol were mainly ...
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The most sensitive cell component to toluene was the plasma membrane where a morphological response in terms of a loss of membrane protuberances and a response in terms of enzymatic activity was observed at 25 ppm both with treatment times of 5 min or less. Thus the plasma membrane is indicated as one important target for toluene intoxication A perturbation of an ATP or ATPase-dependent reaction is indicated. A second target identified was that of the transition region between endoplasmic reticulum and Golgi apparatus where transfer of material appears to be blocked rapidly by 100 ppm or lower toluene both in situ and in a cell-free system newly developed to study this phenomenon. Specifically, membranes involved in the internal trafficking between the endoplasmic reticulum and the Golgi apparatus fail to form protuberances. Again perturbation of the ATP or ATP-dependent step is indicated together with a related involvement of boundary lipids of membrane proteins involved in membrane energization that
Research Summary: The report presents detailed overview of the toluene market in the world and regions (CIS countries in particular) by contemplating and analyzing its various parameters. Firstly, brief introduction is provided. Thus, toluene properties, application areas and manufacturing technologies are considered. Further goes the analysis of global toluene market with emphasis on its main components which […].... ...
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Aromatic solvents market is categorized into xylene, toluene, and ethyl benzene. Among these, xylene is anticipated to hold the largest share in the market during the forecast period
Jan 01, 2007 The effects of temporal and spatial changes in biological activity and biomass amount on biofilter performance were investigated in a lab-scale trickle-bed air biofilter at a toluene loading of 46.9 g m −3 h −1 under two different experimental strategies, namely, periodic backwashing at a rate of 1. h once a week and 2 d starvation.. Analysis of the overall reaction for toluene metabolism. Contact ...
Bestchem Toluene is a pure hydrocarbon (C7H8). i.e. it contains only hydrogen and carbon atoms. It belongs to a particular category of hydrocarbons called aromatic hydrocarbons. Complete combustion of toluene yields CO2 and H2O. This fact ensures that the entire emission control system such as the catalyst and oxygen s
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Nominated Substances: Toluene, Toluene (technical). Nomination Date: 01/00/1979 Nominator: CPSC, EPA, NIOSH, OSHA Rationale: High production; worker and consumer exposure; analog of benzene; lack of toxicological data. NTP Principles: Pre 1993 - 2, 3, 4, 8 (. ...
Local dynamics of polyisoprene in dilute solution with toluene are examined through C-13 NMR relaxation measurements. The variations of T1 and NOE with Larmor frequency are analyzed over a wide temperature range, including both the extreme narrowing region and the T1 minima. A frequency-temperature superposition of the data demonstrates that the distribution of motional time constants does not change shape with temperature and has a temperature and viscosity dependence consistent with that in nine other solvents. The data are analyzed in terms of eight motional models. Only those models that invoke motion on two well-separated time scales are successful. The slower, conformational motions correspond to activated torsional dynamics. The faster motions are librations within potential energy wells. Local dynamics in toluene are believed to exemplify polyisoprene dynamics in other solvents. Some similarities to local dynamics in bulk polymers are also expected.. ...
Definition of toluene in US English - a colorless liquid hydrocarbon present in coal tar and petroleum and used as a solvent and in organic synthesis.
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In this report, the global Aromatics Solvent market is valued at USD XX million in 2016 and is expected to reach USD XX million by the end of 2022, growing
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poly(toluene 2,4-diisocyanate-polycaprolactonediol-ethylenediamine) copolymer: a polyurea-urethane formed from toluene diisocyanate, polycaprolactonediol, and ethylenediamine
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What are other names or identifying information for toluene? What is the WHMIS 1988 classification? What are the most important things to know about toluene in an emergency?
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The kinetics of cyclization of substituted phenyl N-(2-hydroxybenzyl)carbamates and their N-methyl analogs, prepared by the reaction of 2-(aminomethyl)phenols with substituted phenyl chloroformates, was studied in dioxane or toluene at the temperatures 110-180 °C. Electron-withdrawing substituents in the leaving phenoxy group strongly accelerate the rate of cyclization (ρ = 2.45 ± 0.15) while the substituents in the other ring have virtually no effect. The cyclization was catalyzed with triethylamine in toluene but not in dioxane. On the basis of these results, the most convenient method for preparation of substituted 4H-1,3-benzoxazin-2(3H)-ones was a one-hour reflux of substituted 4-nitrophenyl N-(2-hydroxybenzyl)carbamates in dioxane. Based on the influence of substituents, solvents (dioxane and toluene) and triethylamine, the reaction mechanism and structure of the transition state were proposed. Keywords: Carbamates; Cyclizations; Kinetics; Benzoxazines; Benzoxazinones; Substituent ...
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TY - JOUR. T1 - An Inhibitor-Based Method to Measure Initial Decomposition of Naturally Occurring Polysaccharides in Sediments. AU - Boschker, H.T.S.. AU - Bertilsson, S.A.. N1 - Reporting year: 1995 Metis note: 2011; CL; RE; file:///L:/Endnotedatabases/NIOOPUB/pdfs/Pdfs1995/Boschker_ea_2011.pdf. PY - 1995. Y1 - 1995. N2 - A method that can be used to measure the initial decomposition rates of polysaccharides in sediment samples was developed. It uses toluene to specifically inhibit microbial uptake of carbohydrates without affecting extracellular hydrolysis of polysaccharides. Accumulating carbohydrates were determined by high-performance liquid chromatography. Field-sampled litter from the common reed (Phragmites australis), which contains cellulose and arabinoxylan as its main polysaccharides, was used as a model system. Toluene concentrations of between 1 and 10% resulted in the accumulation of similar amounts of monomeric carbohydrates, which was linear over time for most neutral sugars. ...
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Toluene is a volatile organic compound which is made of carbon and hydrogen. This organic compound is a clear, colourless liquid at room temperate and pressure.