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.

Dehydrogenation of Secondary Alcohols with Reduced Copper. IV. Catalytic Dehydrogenation of Isopropyl Alcohol (Part 2)

Abstract: In order to determine whether the dehydrogenating activity of reduced copper is affected by the species of precipitants in the preparation, the dehydrogenation of isopropyl alcohol to acetone was studied by using five different precipitants, i. e. sodium hydroxide, potassium hydroxide, potassium carbonate, sodium bicarbonate and potassium bicarbonate. The dehydrogenation was the highest with no side reaction at 305∼325°C, especially when potassium bicarbonate was used as precipitant. When the copper catalysts, prepared with sodium hydroxide, potassium hydroxide and potassium carbonate, were used, condensation together with dehydrogenation occurred. The formation of higher ketones is explained by the assumption of intermolecular dehydration between acetone and original isopropyl alcohol.

Process for producing salts of pyruvic acid

Abstract: A salt of pyruvic acid is formed by oxidizing a salt of lactic acid with an oxygen-containing gas in a water-containing solvent in the presence of a catalyst. The catalyst used herein comprises (a) at least one component selected from platinum and palladium and (b) at least one component selected from lead, tin, tellurium, indium, bismuth, and compounds of these elements. The resulting pyruvate is isolated in the form of a solid by concentrating the catalyst-free reaction mixture and then mixing isopropyl alcohol therewith.

Flavor and fragrance modifier for perfume and modifying method

Abstract: PROBLEM TO BE SOLVED: To provide a modifier for use in adding to a perfume which affords an improvement in flavor and fragrance characteristics to the perfume, by a method comprising subjecting a leaf of piper betle Line to the extraction with water, a water- containing lower alcohol or an alcohol not containing water. SOLUTION: This modifier for flavor and fragrance can be obtained by providing a raw leaf or a dried leaf of piper betle Line, optionally crushing the leaf, and subjecting the leaf to the extraction with an alcohol not containing water. As to an extracting solvent for a leaf of piper betle Line, the followings are mentioned. Water, a water-containing lower alcohol other than isopropyl alcohol, a lower alcohol not containing water and acetone have no significant difference from one another in effect in modifying the flavor and fragrance of a mint-type perfume. Hexane has only a low effect in such modification. Isopropyl, alcohol is disadvantageous sine it may adversely affect the fragrance of the extract because of its own singular smell. Methanol and acetone are both disadvantageous since they are difficult to be completely separated and removed from the extract. Taking in consideration of subsequent steps such as concentration and decolorization, the use of an alcohol having a water content of 65% or less is preferred. As pieced together from the above-mentioned results, an alcohol having a water content of 5 to 90% is most preferred.