Showing papers on "Isopropyl alcohol published in 1988"

Hydrolysis in the aluminum sec-butoxide-water-isopropyl alcohol system. II: Aging and microstructure

Abstract: Solutions representing a wide range of compositions in the aluminum sec-butoxide-water-isopropyl alcohol system were prepared. Solutions were mixed at room temperature, then gelled and evaporated at 80°C. Regions within this system were distinguished where translucent gels formed instead of precipitates or powders. Translucent gels formed in compositions with high water content and high isopropyl alcohol content. The stages of sol-gel process were investigated by Fourier transform infrared spectroscopy in the early stages and in gels before and after solvent evaporation. The microstructure was characterized by nitrogen sorption analysis.

Hydrolysis in the Aluminum sec‐Butoxide—Water—Isopropyl Alcohol System: I, Rheology and Gel Structures

Abstract: Solutions representing a wide range of compositions in the aluminum sec-butoxide-water-isopropyl alcohol system were prepared. Viscosity measurements were made on solutions hydrolyzed at 20°C, Large differences were observed between low-water solutions and high-water solutions, both in the time evolution of the viscosity and in the effect of isopropyl alcohol content on the viscosity. Higher values of viscosity were attributed to polycondensation of partially hydrolyzed species, while lower values of viscosity were attributed to hydrolyzed clusters. The reduced viscosity was independent of oxide content for low-water solutions, but decreased with increasing oxide content for high-water solutions.

Process for the production of ether and alcohol

Abstract: Olefin undergoes conversion in the presence of water to a mixture of alcohol and ether which is then subjected to various downstream operations including distillation and decantation to provide an ether-rich product containing little if any water. If desired the ether can be combined in any predetermined ratio with co-produced alcohol to provide alcohol/ether mixtures of desired composition. The foregoing process is especially suitable to the conversion of propylene and propylene-containing streams to diisopropyl ether and mixtures of isopropyl alcohol and diisopropyl ether which are useful, inter alia, as octane improves for gasoline.

Kinetics of Ketyl Radical Reactions Occurring in the Photoreduction of Benzophenone by Isopropyl Alcohol

Abstract: Benzophenone – isopropyl alcohol – acetonitrile, benzophenone – benzhydrol – acetonitrile and acetone – isopropyl alcohol – acetonitrile systems were studied by laser flash photolysis transient absorption technique and by steady-state quantum yield determinations. Kinetic parameters were derived for reactions of the ketyl radicals formed in the primary photoreduction steps. The room temperature overall rate coefficients at 0.001 mol dm−3 benzophenone and 2.6 mol dm−3 isopropyl alcohol in acetonitrile are in 108 dm3 mol−1 s−1 units: 12.8 ± 0.6, 8.0 ± 0.4 and 0.59 ± 0.01 for Mc2ĊOH + Me2ĊOH, Me2ĊOH + Ph2ĊOH and Ph2ĊOH + Ph2ĊOH, respectively. (The error limits represent 2 standard deviations.) Combination was shown to be the only significant reaction in the interaction of two Ph2ĊOH radicals, while disproportionation is the dominating path in the reactions inolving Me2ĊOH radicals. Evidences are presented for the existence of four reaction channels in the cross reaction of the two ketyl radicals. These are combination (4a), disproportionations (4b) and (4c) and formation of a “light absorbing transient” (4d), with branching ratios k4a/k4 = 0.18 ± 0.08, k4b/k4 = 0.61 ± 0.11, k4c/k4 = 0.05 ± 0.02 and k4d/k4 = 0.18 ± 0.03, respectively. – The radical transfer reaction Me2ĊOH + Ph2CO Me2CO + Ph2ĊOH, which may change considerably the product distribution and quantum yields in the photoreduction of benzophenone by isopropyl alcohol at medium and low light intensities, was investigated by quantum yield determinations and a room temperature rate coefficient of k5 = (7.3 ± 1.2) · 104 dm3 mol−1 s−1 was extracted through computer model simulation. This rate coefficient is considerably lower than the values reported previously.

Morphological features of the structure of fibres prepared from solutions of cellulose in methylmorpholine oxide

Abstract: Structural features of fibres spun from solutions of cellulose in N-methylmorpholine-N-oxide into isopropyl alcohol have been studied. It has been found that the structural porosity of these fibres is determined to a considerable degree by the temperature of the precipitant — isopropyl alcohol.

Dissolved composition of [benzo-1,2,4-thiadiazine]-1,1-dioxide

Abstract: A dissolved composition containing (A) one or more of [benzo-1,2,4-thiadiazine]-1,1-dioxide derivatives, (B) dimethyl sulfoxide, benzyl alcohol, or the mixture thereof; (C) water; and (D) one or more anionic surfactants and/or surfactants, other than anionic surfactants, having a nitrogen atom in the molecule thereof, or (D') n-decylmethyl sulfoxide, or (D") (i) one or more ampholytic surfactants and/or nonioni-cationic-polar surfactants and (ii) one or more nonionic surfactants having a nitrogen atom in the molecule thereof and, optionally, (E) isopropyl alcohol and (F) a pH controller. This dissolved composition is effective as an ingredient for a hair germination and hair growth promoting agent.

Process for the catalytic hydration of olefins

Abstract: A process is disclosed for converting light olefin(s) to alcohol(s), ether(s) or a mixture of alcohol(s) and ether(s) which comprises contacting a feed containing at least one light olefin with water in the vapour and/or liquid phase under olefin hydration conditions in the presence of acidic zeolite Beta as catalyst to produce said alcohol(s), ether(s) or mixture thereof. The process is especially applicable to the hydration of a propylene-containing feed, for example, a refinery FCC stream containing a substantial amount of propylene, to provide a mixture of isopropyl alcohol (IPA) and diisopropyl ether (DIPE) which is particularly useful as an octane improver for gasoline.

Improved stain for acid-fast bacilli

Abstract: A staining system for acid-fast bacilli includes a primary stain and a secondary stain; the primary stain comprising basic fuchsin, ethyl alcohol, isopropyl alcohol, Phenol nd water, and the secondary stain comprising methylene blue, ethyl alcohol, potassium hydroxide, glycerol, glacial acetic acid, polyvinylpyrrolidone and water.

Studies on the reaction of bis(diisopropyl) thiophosphoryl disulfide with silica in the vulcanization of NR

Abstract: The reaction between bis(diisopropyl) thiophosphoryl disulfide (DIPDIS) and silica has been investigated. The study reveals that DIPDIS can be used as a coupling agent for silica. The chemical bond between the silanol groups of silica and DIPDIS has been established through the isolation and characterization of isopropyl alcohol that is eliminated from the reaction. The chemical nature of the bond is also supported by the IR analysis of the reaction products of silica and DIPDIS obtained both in the presence and absence of rubber. From the exploratory studies it is indicated that DIPDIS can also react with NR even during mixing of ingredients. When used with 2-mercaptobenzothiazole (MBT) or N-oxydiethylene-2-benzothiazole sulfenamide (OBTS) in the presence of silica, DIPDIS exhibits notable activation of cure and enhances the torque, modulus, tensile strength, and the scorch safety.

A process for the hydration of olefins.

Abstract: A process is provided for converting propylene to isopropyl alcohol which comprises contacting water with a feed containing at least a substantial amount of propylene at a mole ratio of water to propylene of less than about 1 in the vapour and/or liquid phase under propylene hydration conditions in the presence of acidic zeolite ZSM-35 as propylene hydration catalyst to produce said isopropyl alcohol.

Alcohol printing solution with reduced fume emission

Abstract: Alcohol solutions for use as fountain solutions in the printing industry are disclosed. The solutions include isopropyl alcohol in amounts of 40% to 95%, ethyl alcohol or other alcohols in amounts of 5% to 60% and ethylene diamine in an amount of 0.015% to 0.040%. The addition of a small amount of ethylene diamine markedly reduces the emission of fumes from the fountain solutions.

Influence of thermal activation of chalcopyrite on activity and selectivity of catalytic decomposition of isopropyl alcohol

Abstract: The decomposition of isopropyl alcohol on natural chalcopyrite was studied by the microcatalytic pulse method in the region 473–673 K. The activity and selectivity of the catalyst was confronted with the temperature of its thermal activation. The apparent activation energies of decomposition were calculated for chalcopyrite activated in argon atmosphere at temperatures of 673, 773, and 873 K. The values of activation energy thus obtained are 61, 38, and 44 kJ mol−1 The liberation of sulfur from the lattice of chalcopyrite caused by thermal activation gives preference to dehydration over dehydrogenation at lower temperatures. The proportion of hydrogen and acetone in reaction products increases with temperature.

Aqueous insecticidal aerosol

Abstract: PURPOSE: To obtain an aqueous insecticidal aerosol not inferior to a recipe of a conventional propellant gas (fluorocarbon gas), by blending an insecticidal formulated concentrate prepared by adding a lower alcohol to a specific insecticidal ingredient with water and dimethyl ether in a specific proportion and filling the resultant mixture in a pressure-resistant vessel. CONSTITUTION: An aqueous insecticidal aerosol obtained by filling contents consisting of 5W20vol.% insecticidal formulated concentrate prepared by adding a lower alcoholic solvent (preferably ethyl alcohol or isopropyl alcohol) to a mixture of a pyrethroid based compound (e.g., Phenothrin(R) or Permethrin(R)) expressed by the formula (X is CH 3 or Cl; R is H or CN) with a carbamate based compound or organophosphorus agent, 15W30vol.% water and 50W90vol.% dimethyl ether or a propellant obtained by adding liquefied petroleum gas to the dimethyl ether in a pressure-resistant vessel having a valve for spraying ≥95vol.% contents at ≥0.5ml per sec rate under 3.0W7.0kg/ cm 2 /25°C and diffusing the contents as fine particles. COPYRIGHT: (C)1989,JPO&Japio

Method for eluting l-tryptophan adsorbed on active carbon

Abstract: PURPOSE:To elute and recover L-tryptophan adsorbed on active carbon in high efficiency, in high purity and industrially advantageously, by using a specific acidic eluent consisting of an aqueous solution of 3-4C alcohol under a specified temperature condition. CONSTITUTION:In eluting and recovering L-tryptophan adsorbed on active carbon with an eluent, an aqueous solution of 3-4C alcohol, especially isopropyl alcohol or tert-butyl alcohol at pH <=3, preferably pH 0.5-1.5 is used as the eluent, the eluting operation is carried out at 30-80 deg.C, preferably 30-60 deg.C and L-tryptophan is eluted and recovered in high recovery ratio under an acidic condition capable of carrying out concentration by reverse osmosis. In this method, further the active carbon can be repeatedly used without requiring specific regeneration operation and the amount of impurities accompanying eluted L-tryprophan is also small.

Method for coloring marine paste product

Abstract: PURPOSE:To color the titled product useful for KAMABOKO (boiled fish paste), etc., capable of effectively using the pericarp of corn, causing neither fading nro ooze of color, by blending a marine paste product with a yellow dyestuff obtained by extracting corn with an organic solvent. CONSTITUTION:A yellow dyestuff obtained by extracting corn with an organic solvent is preferably blended with another dyestuff (e.g. yellow dyestuff of Cape jasmine,l etc.) and added to a marine paste product to give the aimed product. Ethanol or isopropyl alcohol blended with one or more of acetic acid (ethyl ester), n-hexane and ethyl ether may be used as the solvent.

Production of polysaccharide of auricularia auricula

Abstract: PURPOSE:To obtain a polysaccharide of Auricularia auricula (KIKURAGE) having the activity to activate human immunological system, by extracting KIKURAGE with hot water, subjecting the extracted liquid to ultrafiltration, adding a lower alcohol to the filtrate and collecting produced precipitate. CONSTITUTION:Dried KIKURAGE is washed with cold water, a soluble fraction is extracted with hot water, solid component is removed from the extract and the product is centrifuged to obtain clear extract of KIKURAGE. The extract is subjected to ultrafiltration using an ultrafiltration membrane having a fractionation molecular weight of about 10,000-200,000, e.g. UK-200 and NTU-2000 under pressure of 0.5-2.0kg/cm . The obtained liquid is added with a lower alcohol such as methanol, ethanol and isopropyl alcohol and the precipitated KIKURAGE polysaccharide is recovered by filtration.

Crystalline cefadroxil and method for producing it

Abstract: The invention relates to a novel crystalline cefadroxyl hemihydrate having a K.F. between about 3.5 and 2.0% : such compound is more stable than other cefadroxyl molecules. The novel cefadroxyl is obtained preparing and isolating a novel cefadroxil solvate of dimethylacetamide, or of N-methyl-2-­-pyrrolidone or of monomethylformamide, slurrying said solvate with a mixture methanol/isopropyl alcohol 30:70 to 70:30 by volume in the presence of from 5% to 12% of water a temperature of about +45°C to + 55°C and then filtering the so obtained compound.

Chemical and Biological Stability of Indole-3-Butyric Acid (IBA) After Long-term Storage at Selected Temperatures and Light Regimes

Abstract: Concentrated [4.9 mM (1,000 ppm) and 24.6 mM (5,000 ppm)] IBA solutions in 50% isopropyl alcohol were stored in amber and clear glass bottles at 3 temperatures [22–25°, 6°, O°C (72–77°, 43°, 32°F)]...

Production of tetrahydrobenzyl alcohol

Abstract: PURPOSE:To obtain the titled compound useful as an intermediate raw material for epoxy resin, etc., from tetrahydrobenzaldehyde, in an improved yield on an industrial scale at a low cost without using gaseous hydrogen, by carrying out hydrogen-transfer reaction using alcohols and a catalyst. CONSTITUTION:The objective compound can be produced by carrying out hydrogen transfer reaction of tetrahydrobenzaldehyde with alcohols (preferably lower alcohol such as isopropyl alcohol or sec-butyl alcohol) in the presence of a catalyst. The catalyst is preferably mono-sec-butoxyaluminum diisopropylate, aluminum isopropylate, etc., from the viewpoint of reactivity, stability, cost, etc., and is used in an amount of >=0.001wt.%, preferably 0.1-10.0wt.% based on tetrahydrobenzaldehyde. The amount of the alcohol is 100-2,000wt.%, preferably 300-800wt.% based on the above raw material.

Fluorine-containing complex

Abstract: NEW MATERIAL:A fluorine-containing complex, expressed by formula I and having two perfluorononenyloxy groups at both terminals. EXAMPLE:A fluorine-containing complex expressed by formula II. USE:An intermediate capable of providing a pure alcohol from hydrous alcohol. PREPARATION:Perfluorononenyloxyisophthalic acid expressed by formula III is dissolved in a 2-4C alcohol, e.g. ethyl alcohol, propyl alcohol, isopropyl alcohol or butyl alcohol, or an aqueous solution containing the alcohol at room temperature or a temperature between room temperature boiling point while heating, cooled and crystallized to afford the compound expressed by formula I. The above-mentioned compound is useful as the afore-mentioned intermediate since the compound is capable of releasing pure alcohol by thermal decomposition and individually providing a compound expressed by formula III.

Agricultural chemical composition

Abstract: PURPOSE: To obtain an agricultural chemical composition, capable of reliving phytotoxicity, such as the form of oil immersion, caused in spraying a machine oil emulsion and exhibiting excellent effects even as an acaricide and germicide by adding a phospholipid to machine oil CONSTITUTION: An agricultural chemical composition obtained by adding a phospholipid (prepared by collecting from oil seeds of soybean) used as an additive for relieving phytotoxicity to machine oil at (1:20)-(1:1), preferably (1:10)-(1:1) weight ratio A solvent, such as ethylene glycol or isopropyl alcohol, or a surfactant, such as polyoxyethylene alkylamine ether, is preferably added to the agricultural chemical composition consisting of a mixture of the phospholipid and the machine oil COPYRIGHT: (C)1990,JPO&Japio

Separation of dimethyl sulfoxide and iodine

Abstract: PURPOSE:To easily separate dimethyl sulfoxide (DMSO) and iodine which are difficult to be separated by simple distillation, by carrying out steam distillation of a composition containing DMSO and iodine. CONSTITUTION:A composition containing DMSO and iodine is subjected to steam distillation under 0.5-1atm. pressure. The steam distillation is carried out by conventional method comprising e.g. heating of the composition containing DMSO and iodine after mixing with water or blasting of steam into said composition. The composition may be added with isopropyl alcohol, etc., to prevent the deposition of recovered iodine to the apparatus.

Dissolved composition of [benzo-1,2,4-thiadiazine]-1,1-dioxide for hair germination and hair growth promotion.

Abstract: A dissolved composition contains (A) one or more [benzo-1,2,4-thiadiazine]-1,1-dioxide derivatives, (B) dimethyl sulfoxide, benzyl alcohol, or a mixture thereof, (C) water, and either (D) one or more anionic surfactants and/or surfactants, other than anionic surfactants, having a nitrogen atom in the molecule thereof, or (Dʹ) n-decyl­methyl sulfoxide, or (Dʺ) (i) one or more ampholytic sur­factants and/or nonionic-cationic-polar surfactants and (ii) one or more nonionic surfactants having a nitrogen atom in the molecule thereof and, optionally, (E) isopropyl alcohol and/or (F) a pH controller. This dissolved composition is effective as an ingred­ient for a hair germination and hair growth promoting agent.

Hydrolysis of starch to cyclodextrins

Abstract: The yield of cyclodextrins formed in the hydrolysis of starch catalyzed by a cyclodextrin glycosyltransferase can be substantially increased by the addition of certain water-soluble solutes. Alcohols having 1 to 6 carbon atoms form one such class, with ethanol and isopropyl alcohol being especially effective. Another class of solute comprises salts with complexing anions (halides, perchlorates, thiocyanates, and oxoanions of pentavalent phosphorus). When an immobilized cyclodextrin glycosyltransferase is used, yields of beta-cyclodextrin can be increased from approximately 20% to almost 40%, using 15% isopropyl alcohol in a thinned starch feedstock, with glucose production being increased by only about 25%.

Novel tgf peptide

Abstract: NEW MATERIAL:A compound expressed by the formula. USE:Healing promoter of injury, regenerating promoter after partially excising the liver and reagent for cancer test. PREPARATION:For example, a fresh duodenum of pig is treated in boiled water for 5min, homogenized with 0.1M acetic acid and extracted. Then, the extracted liquid is adsorbed into CM-cellulose, eluted with 0.1M hydrochloric acid and salted out to provide precipitates, which are then extracted with isopropyl alcohol and then with methanol. The extracted liquid is concentrated to dryness and dissolved in 0.1M citric acid.phosphoric acid buffer solution (pH6.5) and the resulting solution is poured into CM-cellulose to provide an unadsorbed fraction. Water is then added to the fraction and purification is carried out by subjecting the resultant fraction to iron-exhange column chromatography, reversed phase chromatography, etc., to give the aimed novel peptide.

Pulse radiolysis of ethanol solutions of 2,3,5-triphenyltetrazolium chloride

Abstract: We previously studied the radiation-chemical transformation of 2,3,5-triphyenyltetrazolium chloride (TTC) in isopropyl alcohol. The isopropanol was chosen as the solvent because its radiolysis produced highly reductive alkylhydroxy radicals. This paper attempts to find out how the type of alcohol affects the radiolytic conversion of TTC by studying the mechanism of the latter's reduction in ethanol by microsecond pulse radiolysis with optical recordation of short-lived particles.

Preparation method for ether of quarterly n-substituted saponin

Abstract: Quaternary N-sub-saponin ether is prepared by reacting ginseng saponin or soya saponin with quaternary ammoniumhalohydrine or ammoniumepoxide. Stir the solution of 30g ginseng saponin in 500ml water for 30min., add 30ml HCl (5%), after stirring for 30min. add 40ml isopropyl alcohol and heat to 50≰C, after 2hr add 45ml aqueous solution of 3-chloro-2-hydroxypropylmethylammonium chloride (0.08mole), and then, heat the mixture to 70≰C. Quatermary N-sub.- saponin (61g) is obtained by filtering and drying the product.