Showing papers on "Isopropyl alcohol published in 1990"

Fourier transform infrared spectroscopic studies of the reactivity of vanadia-titania catalysts toward olefins. 1. Propylene

Abstract: The adsorption and transformation of propylene and of several O-containing C{sub 3} organic molecules (namely isopropyl alcohol, acetone, allyl alcohol, acrolein, and acrylic acid) on vanadia-titania in the temperature range 150-673 K have been investigated by IR spectroscopy. At low temperatures (150-200 K), propylene adsorbs as such through {pi}-bonding and reacts later to give an adsorbed species identified tentatively as an allyl radical. Alternatively, it undergoes addition by a surface OH group to given an isopropoxy species. At least two main surface pathways for propylene transformation are active, leading to surface species functionalized at C{sub 2} (isopropoxy species and acetone) and at C{sub 1} (acrolein and acrylates) as well as products arising from coupling of the allyl radical. The results are discussed in relation to literature data concerning the heterogeneously catalyzed selective oxidation of propylene carried out on vanadia-titania as well as on bismuth-molybdate-based catalysts.

Small-angle neutron scattering study of D2O-alcohol solutions

Abstract: Small-angle neutron scattering (SANS) measurements have been carried out on heavy water solutions of ethanol, isopropyl alcohol, n-propyl alcohol, t-butyl alcohol and butoxyethanol between 5 and 37 °C at the concentrations where ultrasonic attenuation exhibits peak values. The wavevector dependence and the absolute intensity of the scattered intensities were analysed according to a microscopic model of the solutions in terms of aggregated complexes. The results indicate that at 25 °C there exist either alcohol ‘micelle-like’ structures or alcohol–heavy water complexes which increase on going from the lower to higher alcohol solutions. As temperature increases from 25 to 37 °C a higher aggregation is observed in butyl alcohol and butoxyethanol solutions. This behaviour is attributed to the demixing tendency of these systems at high temperatures. On going from 25 to 5 °C the aggregation increases again. This trend is associated with the anomalous behaviour of the specific heat and ultrasonic attenuation of these systems. The occurrence of a low-temperature phase transition suggested by these anomalies is supported by our results.

Sprayable surface disinfectant

Abstract: The invention relates to a sprayable surface disinfectant based on lower aliphatic alcohols and anionic surfactants as well as on conventional additives such as corrosion inhibitors, dyes and fragrances, which comprises a combination of (a) 20 to 35% by weight of a mixture of ethyl alcohol and isopropyl alcohol in a weight ratio of 1:2 to 2:1, (b) 0.05 to 0.5% by weight of a mixture of anionic surfactants comprising (b-1) 0.04 to 0.4% by weight of a primary or secondary alkane sulfonate or alkyl sulfate having 10 to 18 carbon atoms in the alkyl radical, and (b-2) 0.01 to 0.1% by weight of an alkyl ether sulfate having 10 to 14 carbon atoms in the alkyl radical in the form of the sodium, magnesium, monoethanolammonium or triethanolammonium salt: (c) an acidifying agent to adjust the pH to 2 - 6 or an alkalizing agent to adjust the pH to 8 - 12: whilst (d) the remainder is water, the weight ratio of alkane sulfonates or alkyl sulfates (b-1) to alkyl ether sulfates (b-2) being within the range of 10:1 to 2:1, and the weight ratio of the total alcohol content (a) to the total surfactant content (b) being within the range of 300:1 to 50:1.

Softening agent composition for paper

Abstract: PURPOSE: To obtain the subject composition used for imparting flexibility to thin paper such as tissue paper, toilet paper or paper towel by compounding a specific compound, glycerol, water, etc., in a specific ratio. CONSTITUTION: The objective composition comprises (A) 40-95wt.% of a compound of formula I (R 1 , R 2 are 12-24C hydrocarbon; AO is C 2 H 4 O, C 3 H 6 O; (n) is 2-25; X is halogen or CH 3 SO 4 ) and having an iodine value of 12-110, (e.g. a compound of formula II), (B) 3-50wt.% of glycerol and (C) 2-30wt.% of water or a ≤4C aliphatic alcohol (e.g. isopropyl alcohol). COPYRIGHT: (C)1992,JPO&Japio

Biological monitoring of occupational exposure to isopropyl alcohol vapor by urinalysis for acetone

Abstract: The relationship of the intensity of occupational vapor exposure to isopropyl alcohol (IPA) with urinary excretion of acetone and unmetabolized IPA was studied in 99 printers of both sexes, who were exposed to up to 66 ppm IPA (as time-weighted average), together with toluene, xylenes, methyl ethyl ketone and/or ethyl acetate. Acetone and IPA concentrations in urine were studied also in 34 non-exposed subjects. Acetone was detectable in the urine of most of the non-exposed, and the urinary acetone concentration increased in proportion to the IPA exposure intensity (r = 0.84 for observed, non-corrected values), whereas the correction for creatinine concentration or specific gravity of urine did not give a larger correlation coefficient. IPA itself was not found in the urine of the non-exposed, and was detectable in urine of only those who were exposed to IPA above a certain level, e.g. 5 ppm. The present study results suggest that urinary acetone is a valuable index for biological monitoring of occupational exposure to IPA as low as 70 ppm.

Kinetics of oxidation of ethanol, isopropyl alcohol, and benzyl alcohol by [ethylenebis(biguanide)]silver(III) cation in aqueous perchloric acid solutions

Abstract: In aqueous acid solutions, the complex [Ag(H2L)]3+(H2L = ethylenebis(biguanide)] quantitatively oxidises ethanol, isopropyl alcohol, and benzyl alcohol to the corresponding carbonyl products at moderate rate. The experimental rate law is –d[complex]/dt=(k1+k2/[H+])[alcohol][complex]. At 40 °C and I= 1.0 mol dm–3, 105k1, (dm–3 mol–1 s–1) and 106k2(s–1) values are: EtOH, 4.2 ± 0.3 and 2.8 ± 0.1; PriOH, 7.5 ± 0.5 and 4.8 ± 0.2; PhCH2OH, 95 ± 6 and 32.5 ± 2 respectively. The upper limit for the rate of reaction of [Ag(H2L)]3+ with methanol, t-butyl alcohol, ethylene glycol, and glycerol is the rate of autodecomposition of [Ag(H2L)]3+ and is less than 10% of the rate of oxidation of EtOH, PriOH, or PhCH2OH. Deprotonation of the alcohols assisted by axial co-ordination to [Ag(H2L)]3+ is suggested as a source of the inverse acid dependence. The whole reaction course is e.s.r. silent and a rate-determining C–H bond cleavage in the –CHOH group appears reasonable. Compared to other metal-ion oxidants, [Ag(H2L)]3+ appears to be the most selective reagent for PhCH2OH.

Effect of using alcoholic and non-alcoholic skin cleansing swabs when sampling blood for alcohol estimation using gas chromatography.

Abstract: A study was carried out using 20 volunteers in whom venepuncture through the skin soaked in either ethyl or isopropyl alcohol was performed. A non-alcoholic cetrimide/chlorhexidine swab was used as a control. All subjects were initially alcohol free. Ethyl alcohol was detected in only one blood sample and the level was found to be only 0.4 mg% (roughly the limit of detection of the assay). A slightly higher level of isopropyl alcohol (3 mg%) was found in one of the blood samples. Alcohol estimation was carried out by head-space gas chromatography using a pair of instruments each fitted with a column exhibiting different retention characteristics. The system was similar to that used by other UK Forensic Science Laboratories where accurate, definitive results are a necessity. It was concluded that under very testing conditions only minute ethanol interference is produced by using alcohol-based skin cleansing swabs. This minimal interference is unlikely to affect clinical sample results, and even in a forensic situation the inadvertent use of alcohol-based swabs is unlikely to lead to a miscarriage of justice.

Fortified glutaraldehyde disinfectant

Abstract: A highly fortified glutaraldehyde formulation is provided consisting of guaternary ammonium chloride; glutaraldehyde; para tertiary amylphenol; citric acid, isopropyl alcohol, and water to form a concentrated formulation which may be diluted as requested.

Additive compound for fuels intended for internal combustion engines

Abstract: Additive compound for fuels intended for internal combustion engines, comprising a a linear- or branched-chain fatty alcohol or mixture of fatty alcohols with 8 to 22 carbon atoms in the main chain; b optionally, a nonionic detergent mainly composed of one or more unsaturated and oxyethylenised linear- or branched-chain fatty alcohols with 8 to 22 carbon atoms in the main chain; c optionally, an antioxidising agent based on an aromatic amine, a gallate or butylhydroxytoluene BHT, the proportion of detergent being from 1 to 50 % by weight and that of the possible antioxidising agent of 0.1-5 % by weight. Likewise, the compound can consist exclusively of 2-octyldodecanol, isopropyl alcohol and, optionally, an antioxidising agent, the proportion of 2-octyldodecanol being between 5 and 100 % by weight of the total composition. It finds an application as an additive for fuels intended for internal combustion engines.

Catalytic oxidation of hydroxy containing aromatic compounds

Abstract: The present invention relates to a process for the catalytic oxidation of hydroxy containing aromatic compounds to form the respective quinone compounds comprising contacting a hydroxy containing aromatic compound of the formula: ##STR1## with a molecular oxygen containing gas in the presence of: (a) a catalytic amount of a cobalt (II) compound, (b) a primary aliphatic amine having the nitrogen atom attached to a tertiary carbon, and (c) an alcohol selected from the group consisting of methyl alcohol, ethyl alcohol, isopropyl alcohol, butyl alcohol, 2,2,2-trifluoroethanol and benzyl alcohol, wherein X is of the formula ##STR2## wherein R is individually selected from the group of radicals consisting of hydrogen, an alkyl having from about 1 to about 18 carbon atoms, an alkoxy having from about 1 to 8 carbon atoms, a phenyl and an aralkyl having 7 to 12 carbon atoms.

Method for the preparation of an alcohol from hydrocarbon

Abstract: A efficient photochemical method for the preparation of an alcohol compound, e.g., benzyl alcohol, from a non-olefin hydrocarbon compound, e.g., benzene, was proposed in which a mixture of the non-olefin hydrocarbon compound as the starting material and a hydrogen donor compound, which is a cycloalkane of 5 to 16 carbon atoms in a molecule, e.g., cyclooctane, or an aliphatic alcohol of up to 10 carbon atoms in a molecule, e.g., isopropyl alcohol, is irradiated with light under an atmosphere of carbon monoxide in the presence of a complex compound of rhodium or iridium, of which at least one of the ligands is preferably a monophosphine or bisphosphine compound. The method is advantageous in that the reaction can proceed under mild reaction conditions and that the amount of the aldehyde compound formed in the reaction mixture as a by-product is very small as compared with conventional methods so as to greatly facilitate isolation of the desired alcohol product from the reaction mixture.

Water soluble polymers as alcohol replacement in lithographic fountain solutions

Abstract: Isopropyl alcohol is partially or completely replaced in an acid fountain solution for lithographic printing by a hydroxypropylcellulose or similar polymer with a molecular weight below 100,000 where a 30% by weight solution of the polymer has a viscosity below 4000 cps at 25°. Printing quality is improved and scumming is controlled when a hydrogen peroxide degraded hydroxypropylcellulose or hydrophobically modified hydroxyethylcellulose replaces alcohol in a fountain solution.

Metal tinting lacquer composition

Abstract: A sprayable metallic-tone lacquer composition comprising a tinted polymer-solvent system containing approximately 5% to about 15% by weight of a transparent film-forming resin consisting of a mixture of an acrylic copolymer and nitrocellulose, and about 1-5% by weight of a metal-simulating dye dissolved in about 80-90% by weight of an organic solvent blend The solvent blend preferably comprises about 25-35% by weight of acetone; 5-15% by weight each of propylene glycol methyl ether acetate, toluene, and methyl isobutyl ketone; and 5-10% by weight each of butyl benzyl phthalate, isobutyl acetate and isopropyl alcohol The lacquer composition are particularly adapted for aerosol application and are prepared by dissolving appropriate amounts of the clear resin mixture in the solvent blend and adding the soluble dye, then pressurizing the resulting tinted resinous solution with a mutually compatible aerosol propellant in a suitable aerosol dispensing container

Method and apparatus for preparing germ-free infusible powder of antibiotics

Abstract: PURPOSE: To obtain an aseptic infusible powder without deteriorating the stability and quality of an antibiotic substance by spray-drying a solution of an antibiotic substance in a circulating inert gas atmosphere in the presence of a salt-forming agent. CONSTITUTION: An antibiotic substance, preferably a β-lactam antibiotic substance (e.g. ampicillin or piperacillin) is dissolved at a concentration of 1-50wt.%, preferably 8-25wt.% in an aqueous mixture consisting of <=80vol.% of water, methanol or ethanol, 70vol.% of acetone and 50vol.% of isopropyl alcohol in the presence of a salt-forming agent (e.g. sodium hydroxide or sodium salt of the alcohol used in the composition). The solution is subjected to ultrasonic treatment and degassing treatment and spray-dried in a circulating inert gas atmosphere to obtain the objective powder. The spray-drying is carried out at a solution temperature of 50-550 deg.C, preferably 150-240 deg.C and an extracted powder temperature of 90-200 deg.C, preferably 95-130 deg.C.

Additive used in pulverized coal/oil mixture

Abstract: PURPOSE:To provide the title additive which gives a pulverized coal/oil mixture excellent in stability and fluidity by using as essential constituent a compound comprising an alkylene oxide adduct of an amine/phenol/formaldehyde condensate CONSTITUTION:An amine (eg methylamine), a phenol (eg phenol), and formaldehyde are made to undergo condensation reaction The condenate is subjected to addition reaction with an alkylene oxide (eg ethylene oxide) The title additive is produced by using the compound thus obtained [eg of formula I or II (wherein EO is -CH2-CH2-CH2-O-)] as the essential constituent and, if necessary, incorporating a solvent (eg isopropyl alcohol), an additive, etc, therein The addition of about 001-5wt% of the title additive thus prepared to a pulverized coal/oil mixture can prevent even the settling of relatively large coal particles

Pressure-sensitive adhesive for flexible vinyl chloride resin

Abstract: PURPOSE:To obtain the title one-pack adhesive excellent in adhesiveness, holding power and long-term stability of these properties by dissolving a specified acrylic resin and a complex compound of a keto-enol tautomer with a polyvalent metal in a solvent containing an alcoholic solvent. CONSTITUTION:100 pts.wt. acrylic resin of an average MW >=10000, obtained by polymerizing a monomer mixture containing at least 40wt.% 4-12C alkyl (meth)acrylate, 0.1-15wt.% at least one alpha,beta-unsaturated carboxylic acid (anhydride) (e.g., acrylic acid) and 10-59.9wt.% at least one 1-8C alkyl vinyl ether, and 0.01-1.0 pt.wt. complex compound of a keto-enol tautomer with a polyvalent metal (e.g., aluminum acetylacetonate) are dissolved in a solvent (e.g., toluene) containing at least 10wt.% alcoholic solvent (e.g., isopropyl alcohol).

Production of high-purity o-5,6,7,8-tetrahydronaphthyl-n-methyl-n-(6-methoxy-2-pyridyl)thiocarbamate

Abstract: PURPOSE:To obtain the subject high-purity compound by recrystallizing crude O-5,6,7,8-tetrahydronaphthyl-N-methyl-N-(6-methoxy-2-pyridyl)thiocarba mate from a specific solvent and then purifying the resultant compound by chromatography. CONSTITUTION:Crude O-5,6,7,8-tetrahydronaphthyl-N-methyl-N-(6-methoxy-2- pyridyl)thiocarbamate obtained by condensing 2-(5,6,7,8-tetrahydronaphthoxy)- chlorothioformate with 2-methylamino-6-methoxypyridine in the presence of a dechlorinating agent is recrystallized from a 1-3C alcohol, such as isopropyl alcohol, to provide 99.5% purity and then recrystallization from n-hexane is carried out to afford 99.7% purity. The resultant compound is subsequently purified by silica gel chromatography having average 200 mesh particle diameter (eluent; n-hexane/ethyl acetate) to afford the objective compound of purity as high as >=99.9% useful as a medicine.

Preparation of natural bitter substance

Abstract: PURPOSE:To profitably and inexpensively prepare a highly safe natural bitter component from a readily available natural raw material by a simple means by specifying the concentration of an organic solvent when the water extract of roasted coffee is treated with the water-miscible organic solvent to extract the bitter component. CONSTITUTION:In a method for collecting an organic solvent-soluble fraction by adding a water-miscible organic solvent to the water extract of roasted coffee and removing the resultant water insolubles, the concentration of the organic solvent is adjusted to >=40wt.%. The organic solvent includes methanol, ethanol, isopropyl alcohol, acetone and methylethyl ketone. The natural bitter substance can be prepared into any arbitrary shape such as a solution, paste, syrup or emulsion depending to the uses thereof.

Production of sulfobetaine

Abstract: PURPOSE:To obtain the title compound useful as detergent, etc., in high yield by adding a specific amount of alcohol, continuously or intermittently adding an alkali to specify pH of reaction system and reacting a tertiary amine with a halcalkylsulfonate. CONSTITUTION:A compound shown by formula I (R1 is 8-25C alkyl or alkenyl; R2 and R3 are 1-3C alkyl or hydroxyalkyl) is reacted with a compound shown by formula II (R4 is 2-4C alkylene or hydroxyalkylene; X is halogen; M is alkali metal) while adding 2-20wt.% based on total amounts added of 1-4C alcohol (e.g. ethanol or isopropyl alcohol) and continuously or intermittently feeding an alkali so that 1% pH of the reaction system is kept at 6-8 to give a sulfobetaine shown by formula III.

Process for reducing isopropyl alcohol in diisopropyl ether

Abstract: A process is disclosed for selectively sorbing contaminating amounts of isopropyl alcohol from diisopropyl ether by contacting with a high surface area strong acid type cation exchange resin in the hydrogen form, preferably having a mean pore diameter in the range from about 40 to about 259 Angstroms.

Cleaning fluid and cleaning method using same

Abstract: PURPOSE:To provide a cleaning fluid capable of effectively removing fine dust or metallic ions adhered, due to static electricity, to objects to be cleaned, having a specific resistivity value, comprising an alcohol, pure water and carbon dioxide. CONSTITUTION:The objective cleaning fluid =5vol.% of an alcohol such as isopropyl alcohol, ethanol, methanol or butanol, (B) pref. >=95vol.% of pure water, and (C) a trace amount of carbon dioxide.

Production of oxidation catalyst

Abstract: PURPOSE:To obtain a catalyst contg. (VO)2P2O7 for the production of maleic acid. etc., without degradation, having excellent wear resistance by reacting V2O4 with phosphoric acid in an org. solvent, by suspending the produced (VO)2 H4P2O9 in water, by stirring at a specified temp., by spray-drying and by calcining. CONSTITUTION:V2O5 powder is added to mixed alcohol of isobutyl alcohol and benzyl alcohol, refluxed by heating and stirred to produce V2O4. The V2O4 is added with H3PO4 to produce (VO)2H4P2O9. The (VO)2H4P2O9 is filtered, washed with isopropyl alcohol and then, suspended in water. The produced aq. slurry is heated at 50-200 deg.C and stirred for about 10hr. The slurry is spray- dried to granulate in minute spheres. These spheres are calcined at about 500 deg.C to obtain the catalyst. Thus the catalyst with little abrasion can be obtd.

Multi-component high-efficient detergent for removing welding flux

Abstract: This detergent is composed of nitromethane, acetonitrile, ethyl acetate, 111-trichloroethane, and isopropyl alcohol or acetone or alcohol, and is featured by good stability, no corrosion to workpiece, electronic elements and equipment, high permeating power, efficient removal of welding flux and derosination, low toxicity and easy prepn It is esp suitable for TV prodn line and other electronic industries

Manufacture of thermal transfer recording medium

Abstract: PURPOSE:To improve the stability of the storage of ink, and to prevent the cutting of the polycarbonate film of a base material during coating by dissolving and dispersing wax and a colorant into a solvent containing specific wt.% or more of isopropyl alcohol and applying the solvent onto the base material and drying the solvent. CONSTITUTION:When an ink component is dissolved or dispersed into a solvent and the solvent is applied onto a base material and the solvent is dried and a thermal transfer recording medium formed is manufactured, isopropyl alcohol is used as the not less than 50wt.% solvent. The reaction product of 30-60C alkyl alcohol and a diisocyanate compound and/or a triisocyanate compound is preferable as wax. A base material in which aluminum is evaporated onto a polycarbonate film including conductive carbon is desirable as the base material. Accordingly, the stability of the storage of ink is improved, and the cutting of the polycarbonate film of the base material during coating can be prevented.

Additive for dampening water of lithographic printing form plate and stock solution of dampening water

Abstract: PURPOSE: To obtain dampening water capacity which is equal with isopropyl alcohol, by a method wherein nonionic surfactant having a fluoroalkyl group is added to water-soluble glycol monoalkyl ether selected out of a group of monoalkyl ether of di-or triethylene glycol and mono or dipropylene glycol CONSTITUTION: Almost a 01-10ptsnonionics surfactant having a fluoroalkyl group is added to 100 pts water-soluble glycol monoalkyl ether selected out of a group of monoalkyl ether of di or triethylene glycol and mono or dipropylene glycol, for example monoethyl butyl isobutyl propyl isopropyl ether of diethylene glycol and made into an additive for dampening water The dampening water is allowed to contain a 40-80wt% additive COPYRIGHT: (C)1994,JPO&Japio

Kinetics of Oxidation of Ethanol, Isopropyl Alcohol, and Benzyl Alcohol by (Ethylenebis(biguanide))silver(III) Cation in Aqueous Perchloric Acid Solutions.

Abstract: The title reaction proceeds via two concurrent paths, both first order with respect to the concentration of the reagent and the alcohol.

Investigation of loss factors of some alcohols

Abstract: The behavior and strength of dielectrics used in electric circuits are investigated with the method of loss factor and Q-factor. The purpose is to calculate the tq delta loss factors of certain liquids. Two liquids of aliphatic structure and one of aromatic structure were dissolved in nonpolar benzene at different concentrations. The results of these measurements are discussed in view of both the structures of the materials and the mechanism involved in the association of their molecules. In addition, the experimental results are compared to the theoretical calculations. The loss tangent was shown to increase linearly with molecule length. At 50% concentration, the loss tangent values of n-butyl alcohol, isopropyl alcohol, and benzyl alcohol are approximately 8*10/sup -3/, 6.5*10/sup -3/, and 2.8*10/sup -3/ respectively. The Q-factor values of n-butyl alcohol, isopropyl alcohol, and benzyl alcohol are 200, 228 and 505 respectively. >

Kinetic Resolution of α-Arylcarboxylic Acid Derivatives by a Catalytic Use of a Chiral Titanium Alkoxide.

Abstract: Kinetic resolution of racemic α-arylcarboxylic acids is successfully achieved by a catalytic use of titanium tetraisopropoxide and a chiral 1,4-diol in the reaction of the corresponding 2-pyridinethiol esters and isopropyl alcohol.