30 results about "Methylsuccinic acid" patented technology

The present invention provides a method for preparing a compound of formula (I), the method comprising contacting a compound of formula (II) with an effective amount of a compound of formula (III) or (IV). The present invention also provides a method for preparing a compound of formula (VI), the method comprising contacting a compound of formula (II) with an effective amount of one or more of 2,2-dimethylsuccinic acid, 2,2 dimethylbutanedioyl dichloride, 2,2-dimethylbutanedioyl dibromide, and 2,2 dimethylsuccinic anhydride. The present invention also provides a compound obtained from the method of the present invention.

The present invention provides a commercially viable process for the preparation of highly pure and optically active L-(+)-lactic acid and S-(−)-methyl lactate, in high yield, obtained from esterification of aqueous crude lactic acid solution produced by sugar cane juice fermentation broth and methanol in continuous counter current trickle phase approach or in continuous counter current bubble column manner, using stabilizers and the methyl lactate so obtained is recovered and followed by purification of reasonably pure methyl lactate using reagent mixture such as sodium bi-carbonate, mono-ethanolamine or di-ethanolamine, urea or sodium-bicarbonate, mono-ethanolamine or di-ethanolamine, thiourea to reduce the impurity of dimethyl ester of dicarboxylic such as dimethyl oxalate or di-methyl succinate or methyl ester of mono-carboxylic acid such as methyl pyruvate present as an impurity, so as to get highly pure S-(−)-methyl lactate followed by hydrolyzing highly pure S-(−)-methyl lactate using highly pure lactic acid as a catalyst, using highly pure water as the hydrolysis media and by using pre-treated activated carbon with dilute L-(+)-lactic acid, in batch or continuous mode. This very high pure S-(−)-methyl lactate constitutes an important product having interesting possibilities of application at an industrial level, in pharmaceuticals. Highly pure L-(+)-lactic acid thus obtained is used as an acidulant, as a food additive, for pharmaceutical applications, a monomer for making poly-lactic acid, as a monomer to prepare biodegradable polymer which are useful for manufacturing bags, application films, in the field of sanitary field, and has medical applications.

A propylene polymerization catalyst system, comprising a solid catalytic component (A), an aluminum alkyl (B) and a multi-component external electron donor (C), wherein the component (A) is a magnesium chloride-supported Ti solid component, and contains adjacent Phthalic acid diester internal electron donor; component (B) is trialkyl aluminum; component (C) includes the first type of external electron donor and the second type of external electron donor, the first type of external electron donor The molar ratio with the second type of external electron donor is 1-70:30-99; wherein the first type of external electron donor is selected from dicyclopentyldimethoxysilane, diisopropyldimethoxysilane Silane; the second type of external electron donor is selected from di-n-butyl 2-cyano-2,3-dimethylsuccinate. The heat-resistant polypropylene obtained by using the catalyst system has high regularity and wide molecular weight distribution, so that the material has a good balance of rigidity and toughness. The technology does not need to modify the original device, is suitable for existing industrial production devices with different processes, and has good economic promotion value.

The invention discloses a method for synthesizing methylsuccinic acid by water phase catalysis. Methyl succinic acid is an important intermediate in organic synthesis and has a wide range of applications. The present invention adopts Ru-based catalyst to carry out catalytic hydrogenation reaction to itaconic acid to produce methylsuccinic acid in water phase and under mild reaction conditions, the conversion rate and selectivity can reach 99%, and the catalyst can be used multiple times. recycle.