Methyl isobutyl ketone

About: Methyl isobutyl ketone is a research topic. Over the lifetime, 2071 publications have been published within this topic receiving 26976 citations. The topic is also known as: Hexone & Isobutyl methyl ketone.

Triphasic system for direct conversion of sugars to furandicarboxylic acid

Abstract: There is provided a one-pot process for the conversion of sugars to furancarboxylic acids, such as 2,5-furancarboxylic acid (FDCA), in a triphasic system (e.g. water or tetraethylammonium bromide (TEAB) – methyl isobutyl ketone (MIBK) – water). In this reaction setup, sugars are first converted to 5-hydroxymethylfurfural (HMF) in a first phase. Then HMF is then extracted into a second phase and transferred to a third phase of water. In the third phase HMF is converted to the furancarboxylic acid. The overall acid yields obtainable are between about 78% and 50% for conversion from fructose and glucose, respectively. The invention further relates to an apparatus for the triphasic reaction. The apparatus comprises two chambers which allow for the chemically separated reaction of the sugars and the intermediate of the sugars to form the final product in one process. The process according to the invention may be useful for industrial fabrication.

Process for purification of isocyanate group-containing compounds

Abstract: Isocyanate group-containing reaction products of organic diisocyanates with organic compounds containing at least two alcoholic hydroxyl groups and isocyanurate polymers of organic diisocyanates contaminated with said diisocyanates are purified by heating said reaction product or polymer in a solvent inert towards the isocyanate group with a diisocyanate-absorptive material inert towards and insoluble in said solvent and selected from active carbon, alumina, silica gel, gelatine, glue, siliceous earths, natural and synthetic rubbers, polyamides, polyvinyl acetate, polymethyl methacrylate and polystryene and subsequently removing the absorbent. The purification is conveniently performed at between 0 DEG and 100 DEG C. by agitating a solution containing 20-80% by weight of the reaction product or polymer with 1 to 40% by weight of the reaction product or polymer of absorbent which has previously been dried by heating in vacuum at 120 DEG C. The treatment time is normally greater than 10 hours after which the absorbent is removed by, for example, filtration or centrifugal means. The process of the invention is especially useful when applied to the reaction products or polymers of tolylene-2 : 4- or -2 : 6-diisocyanate, hexamethylene diisocyanate or mixtures thereof. Specified inert solvents are ethyl, butyl and ethoxy ethyl acetates, methyl isobutyl ketone, acetone, toluene, xylene or mixtures thereof. Specifications 795,051 and 795,052 are referred to.ALSO:Isocyanate group-containing reaction products of organic diisocyanates with organic compounds containing at least two alcoholic hydroxyl groups and isocyanurate polymers of organic diisocyanates contaminated with said diisocyanates are purified by heating said reaction product or polymer in a solvent inert towards isocyanate groups with a diisocyanate-absorptive material inert towards and insoluble in said solvent and selected from active carbon, alumina, silica gel, gelatine, glue, siliceous earths, natural and synthetic rubbers, polyamides, polyvinyl acetate, polymethyl methacrylate and polystyrene and subsequently removing the absorbent. The purification is conveniently performed at between 0 DEG and 100 DEG C. by agitating a solution containing 20-80% by weight of the reaction product or polymer with 1 to 40% by weight of the reaction product or polymer of absorbent which has previously been dried by heating in a vacuum at 120 DEG C. The treatment time is normally greater than 10 hours after which the absorbent is removed by, for example, filtration or centrifugal means. The process of the invention is especially useful when applied to reaction products or polymers of tolylene-2 : 4- and -2 : 6-diisocyanates, hexamethylene diisocyanate or mixtures thereof and in particular isocyanurate or mixed isocyanurate polymers of said diisocyanates and reaction products of said diisocyanates with trihydric alcohols. Specified inert solvents are ethyl, butyl and ethoxy ethylacetates, methyl isobutyl ketone, acetone, toluene, xylene or mixtures thereof. Specifications 795,051 and 795,052 are referred to.

Method for fermenting, extracting and preparing high purity pleuromutilin raw material

Abstract: The invention discloses a method for fermenting, extracting and preparing high purity pleuromutilin raw material, comprising: filtering fermentation liquor used for fermenting and culturing pleurotusmutilus, and obtaining wet thallus containing the pleuromutilin; after drying the wet thallus, obtaining dry thallus; then, taking methyl isobutyl ketone as solvent for extracting for a plurality of times, and obtaining extracted filtrate; concentrating the filtrate, and obtaining concentrated solution containing the pleuromutilin; after carrying out temperature reduction and crystallization on the concentrated solution, obtaining crystalloid containing the pleuromutilin; and finally, vacuum drying and grinding the crystalloid, and obtaining the raw material powder of the pleuromutilin The method has simple technique and easy operation, and the obtained pleuromutilin has high yield, good quality and the content reaching more than 95%; furthermore, the methyl isobutyl ketone which is adopted as solvent has good dissolubility, can be recycled, is high in recovery rate, saves the using quantity of the solvent by about 15% compared with the existing technique, and has little environmentalpollution