Isopropyl alcohol

About: Isopropyl alcohol is a research topic. Over the lifetime, 3064 publications have been published within this topic receiving 27354 citations. The topic is also known as: Rubbing Alcohol & Propan-2-ol.

Polymerization of vinylpyrrolidone to various molecular weights using a single initiator system consisting essentially of t-Butylperoxypivalate

Abstract: Vinylpyrrolidone is polymerized using free radical initiator consisting essentially of t-Butylperoxypivalate and preferably in solvent consisting essentially of water, isopropyl alcohol, sec. butyl alcohol or mixtures thereof.

Adsorption kinetic, thermodynamic, and desorption studies of isopropyl alcohol vapor by oxidized single-walled carbon nanotubes.

Abstract: Single-walled carbon nanotubes (SWCNTs) were oxidized by sodium hypochlorite (NaOCl) solution and used as adsorbents to study adsorption kinetics, thermodynamics, and desorption of isopropyl alcohol (IPA) vapor in an airstream. The adsorption capacity of IPA decreased with temperature, indicating an exothermic nature of the adsorption process, and slightly decreased with relative humidity, showing a hydrophobic nature of the adsorbent surface. The adsorption mechanism appears mainly attributable to physical forces from 5 to 25 °C but appears primarily attributable to chemical forces from 25 to 35 °C. A comparative study on the cyclic IPA adsorption between SWCNTs(NaOCl) and granular activated carbon, GAC(NaOCl), was also conducted and the results revealed that the SWCNTs(NaOCl) show better repeated availability of IPA adsorption during 15 cycles of operation than the GAC(NaOCl). This suggests that the SWCNTs(NaOCl) are efficient IPA adsorbents and can be used in the prolonged cyclic adsorption/de...

Gas phase esterification of acetic acid with ethanol over MoO3 supported on AlPO4 and the effect of modification with phosphomolybdic acid and Ce4+ ions

Abstract: A series of AIPO4–MoO3 (APM) systems with various molybdena loadings (5–50) mol %, same modified with phosphomolybdic acid (PMA) and cerium ions, were prepared by an impregnation method and calcined at 400 °C, except for the samples modified with PMA which were calcined at 350 °C for 4 h The catalysts were characterized by TG/DTG, XRD, IR spectroscopy, N2 adsorption and electrical conductivity measurements The surface acidity and basicity of the catalysts were determined by adsorption of pyridine and the dehydration–dehydrogenation of isopropyl alcohol The catalytic esterification of acetic acid with ethanol was carried out in a convention fixed bed reactor The results clearly revealed that the catalyst with a composition of 10 mol % MoO3 (APM10) was the most active and selective catalyst for the production of ethyl acetate Moreover, the yield of ethyl acetate increases on addition of PMA into APM10 while it decreases on the addition of Ce4+ ions These results were correlated with structure, semiconductivity and the acid–base properties of the prepared catalysts Copyright © 2003 Society of Chemical Industry

Copolymers of acrylamide and vinyl aromatic sulfonates

Abstract: Copolymers of 99 to 90 mole per cent of acrylamide and 1 to 10 mole per cent of at least one compound selected from vinyl benzene sulphonic acid, vinyl benzyl sulphonic acid, water-soluble alkali and alkaline earth metal salts of said acids, and alkyl substitution products of said acids and salts having 1 or 2 alkyl radicals, each containing 1 to 3 carbon atoms, attached to the benzene nucleus, may be prepared by copolymerizing acrylamide with the acid or salt in aqueous solution at a pH of 3 to 9. The aqueous media may contain alcohols such as methyl alcohol, ethyl alcohol and isopropyl alcohol. The polymerization may be catalysed by soluble free-radical polymerization catalysts, e.g. sodium persulphate, potassium persulphate, ammonium persulphate, hydrogen peroxide and tertiary butyl hydroperoxide, or by ultraviolet light, X-rays, g -rays and high energy electrons. Traces of acrylamide peroxide normally present in the acrylamide may be sufficient to initiate polymerization in the presence of sodium sulphite. Examples describe the copolymerization of acrylamide with sodium vinyl benzyl sulphonate and sodium vinyl benzene sulphonate. The products may be used for flocculating suspensions of mineral solids, e.g. uranium ores.ALSO:Sodium vinyl benzylsulphonate may be prepared by adding vinylbenzyl chloride portionwise with agitation to an aqueous solution of sodium sulphite at room temperature. Unreacted vinylbenzyl chloride may be extracted with benzene and the sodium vinylbenzyl-sulphonate crystallised by chilling the aqueous solution.ALSO:A method of flocculating aqueous suspensions of finely divided mineral solids comprises admixing with the suspensions aqueous solutions of water-soluble high molecular weight copolymers of 99 to 90 mole per cent acrylamide and 1 to 10 mole per cent acrylamide and 1 to 10 mole per cent of at least one sulphonated vinyl aromatic compound selected from vinylbenzene sulphonic acid, vinylbenzyl sulphonic acid, water-soluble alkali and alkaline earth metal salts of said acids, and alkyl substitution products of said acids and salts having 1 or 2 alkyl radicals, each containing 1 to 3 carbon atoms, attached to the benzene nucleus. The flocculated material may be separated by decantation, filtration or centrifugation Examples describe the flocculation of aqueous slurries of acid-leached South African uranium ore using (6 and 8) acrylamide-sodium vinylbenzene sulphonate copolymers, (7) acrylamide-sodium vinylbenzyl sulphonate copolymers and, for comparison, polyacrylamide.