• solvents
  • To screen amine solvents for application in CO2 capture from coal-fired power plants, the equilibrium CO2 partial pressure and liquid film mass transfer coefficient were characterized for CO2-loaded and highly concentrated aqueous amines at 40 - 100 °C over a range of CO2 loading with a Wetted Wall Column (WWC). (utexas.edu)
  • This increased stability of the MDEA/PZ solvent blend over MDEA and other amine solvents provides for greater capacity for and requires less work to capture a given amount of CO2. (wikipedia.org)
  • nonetheless, the CO2 absorption rate, heat of absorption, and solvent capacity are increased through the addition of piperazine to amine gas treating solvents, the most common of which is MDEA due to its unmatched high rate and capacity efficiency. (wikipedia.org)
  • polyamines
  • Stanley W. Dylewski & Glenn W. Warren, "Production of ethylene polyamines", published Nov 6, 1956, assigned to Dow Chemical Co. US 3484488, Thomas H. Cour & Myrl Lichtenwalter, "Controlled production of ethylene amines", published Dec 16, 1969, assigned to Jefferson Chem Co. Inc. "Ethyleneamines" (PDF). (wikipedia.org)
  • imidazolide
  • Reaaction of the resulting amine with the imidazolide derivative of 5-Methoxy-3-indoleacetic acid affords the amide reverse transcriptase inhibitor, atevirdine. (wikipedia.org)
  • Acylation of this amine with the imidazolide from 5-Methylsulfonaminoindole-2-carboxylic acid (1) affords the amide, reverse transcriptase inhibitor, atevirdine. (wikipedia.org)
  • compositions
  • These amine acrylates can be used bythemselves to produce protective coatings or they can be mixed with other known coating compositions to enhance the cure rate of these other compositions. (patentgenius.com)
  • The compositions comprise from one-fourth to about 10% by weight of alkali metal hydroxide, from 40 to about 60% by weight of at least one liquid high boiling oxygenated solvent, and from 40 to about 60% by weight of at least one liquid high boiling amine. (google.com)
  • One of these advantages is a low vapor pressure, which allows for high amine compositions without appreciable losses through the absorber and regenerator. (wikipedia.org)
  • hydrogen
  • The amine acrylates of this invention are produced by the reaction of a polyacrylate ester, preferably a diacrylate ester with an amine having at least one hydrogen atom attached to the nitrogen atom. (patentgenius.com)
  • The suitable diacrylate esters for producing the amine acrylates have the general structural formula: ##STR2## wherein Z can be hydrogen or methyl and R is the residue of the diol used to produce the diacrylate ester as hereinafter described. (patentgenius.com)
  • Polar groups, hydroxyls and amine groups can form acid-base and hydrogen bonds with polar groups on substrates like paper or wood or natural fibers. (wikipedia.org)
  • degradation
  • Amine blends that are activated by concentrated piperazine are used extensively in commercial CO2 removal for carbon capture and storage (CCS) because piperazine advantageously allows for protection from significant thermal and oxidative degradation at typical coal flue gas conditions. (wikipedia.org)
  • colorless
  • This oily liquid is colorless but, like many amines, assumes a yellowish color due to impurities resulting from air-oxidation. (wikipedia.org)
  • atoms
  • Piperazine (/paɪˈpɛrəziːn/) is an organic compound that consists of a six-membered ring containing two nitrogen atoms at opposite positions in the ring. (wikipedia.org)
  • lean
  • The liquid film mass transfer rate is dependent on the diffusion coefficients of amine and CO2 to the same extent at lean loading and 40 °C. The sum of the powers for the two diffusivities is approximately equal to 0.5 over the loading range of 0 - 0.4 mol CO2/mol alkalinity. (utexas.edu)
  • In the Boundary Dam plant, emissions increased when CO2 loading of lean amine increased for the blend and MEA. (wikipedia.org)
  • diol
  • In its broader aspects the polyacrylate esters that can be used in the production of the amine polyacrylates are those having the structural formula: ##STR1## wherein Y is the residue of a polyol (i.e. diol, triol, tetrol) used to produce thepolyacrylate ester and r can be an integer having a value of from 2 to 4 depending on whether the polyol was a diol, triol or tetrol. (patentgenius.com)
  • widely
  • A tertiary amine, it is widely used as a sweetening agent in chemical, oil refinery, syngas production and natural gas. (wikipedia.org)
  • functional
  • In the production of these shaped articles these higher functional amine acrylates are extruded to shape and then cured by exposure to the radiation energy. (patentgenius.com)
  • form
  • A form in which piperazine is commonly available industrially is as the hexahydrate, C4H10N2. (wikipedia.org)
  • 6H2O, which melts at 44 °C and boils at 125-130 °C. Two common salts in the form of which piperazine is usually prepared for pharmaceutical or veterinary purposes are the citrate, 3C4H10N2.2C6H8O7 (i.e. containing 3 molecules of piperazine to 2 molecules of citric acid), and the adipate, C4H10N2.C6H10O4 (containing 1 molecule each of piperazine and adipic acid). (wikipedia.org)
  • Piperazine-containing buffers (PIPES, HEPES, POPSO and EPPS) can form radicals and should be avoided in studies of redox processes in biochemistry. (wikipedia.org)
  • sodium
  • The amine is liberated by addition of sodium hydroxide and can then be recovered by rectification. (wikipedia.org)
  • However
  • It is important to note, however, that piperazines are not derived from plants in the Piper genus. (wikipedia.org)
  • There is evidence of tandospirone having low but significant antagonistic activity at the α2-adrenergic receptor through its active metabolite 1-(2-pyrimidinyl)piperazine (1-PP), however. (wikipedia.org)
  • rates
  • It has been found that the amine acrylates of this invention when used in coating compositionscure at extremely rapid rates. (patentgenius.com)
  • give
  • Preparation of the pyridylpiperazine moiety starts by aromatic displacement of chlorine from 2-Chloro-3-nitropyridine by piperazine to give 3. (wikipedia.org)
  • usually
  • The amine acrylates produced with these higher functionality esters are generally much more viscous, usually gel-like in nature, and find preferred applications in theproduction of extruded shaped articles, e.g., tubes, bars, rods, films, etc. (patentgenius.com)
  • effects
  • Piperazines, especially BZP and TFMPP were extremely common adulterants in the club and rave scene, often being passed off as MDMA, although they do not share many similarities in their effects. (wikipedia.org)