摘要:
The present invention relates to a production method of (R)-3-hydroxy-3-(2-phenylethyl)hexanoic acid which comprises optical resolution of racemic 3-hydroxy-3-(2-phenylethyl)hexanoic acid with an optically active amine of the formula (VIII) 1 wherein R2 is 3,4-dimethoxyphenyl or 2-chlorophenyl. According to the present invention, (R)-3-hydroxy-3-(2-phenylethyl)hexanoic acid useful as a starting material of a pharmaceutical agent can be efficiently produced with a high optical purity and a relatively high total yield.
摘要:
A process for preparing 3,3-dimethylbutyric acid includes the steps of reacting trimethylpyruvic acid with a first portion of hydrazine to obtain a ketazine, and treating the ketazine with base and a second portion of hydrazine.
摘要:
Processes for preparing conjugated fatty acid products are described wherein (a) a composition which comprises a fatty acid ester having at least two unconjugated, carbon-carbon double bonds is provided; (b) the fatty acid ester is conjugated in the presence of a water-free base; (c) phosphoric acid is added to the conjugated fatty acid ester such that phosphate salts are precipitated; and (d) the precipitated phosphate salts are removed.
摘要:
Disclosed is a process for purifying 2,6-naphthalene dicarboxylic acid produced by disproportionation and more efficiently recycling byproduct dipotassium salts which includes the steps of: a) Contacting an aqueous solution containing the disalt of 2,6-NDA(2,6-K2NDA) with carbon dioxide to form as a precipitate the monopotassium salt of 2,6-NDA (KHNDA) and an aqueous solution containing 2,3-KHNDA, K2NDA, and potassium bicarbonate; b) Disproportionating said monopotassium salt (KHNDA) to form 2,6-NDA and an aqueous solution containing K2NDA, and potassium bicarbonate; c) Separating said 2,6-NDA and concentrating said aqueous solution containing K2NDA and potassium bicarbonate by reverse osmosis.
摘要:
A process produces sorbic acid by hydrolyzing a polyester with an aqueous hydrochloric acid solution having a concentration of 15% by weight or less under the application of pressure or at a temperature of 100null C. or higher, which polyester is obtained by reaction between crotonaldehyde and ketene. In this process, the polyester may be hydrolyzed with a 3 to 10% by weight aqueous hydrochloric acid solution at a temperature of from 115null C. to 140null C. A reaction mixture after hydrolysis of the polyester may be subjected to solid-liquid separation and the resulting filtrate may be recycled and reused in the hydrolysis reaction of the polyester. This process can significantly reduce the amount of tar formed during decomposition of the polyester, can produce sorbic acid in a high yield, and can reduce the load on the treatment of waste filtrates formed during purification operation.
摘要:
The present invention relates to the manufacture of conjugated linoleic acid, and in particular, to dietary supplements, feeds and food products containing conjugated linoleic acid. Accordingly, processes for producing conjugated linoleic acid of high purity and acid value are disclosed. These processes utilize alcoholate catalysts and esters of sunflower oil, safflower oil, or corn oil as the source of linoleic acid. The esters of conjugated linoleic acid produced by the process can be used in animal feeds and in food products suitable for human consumption. Furthermore, the esters can be converted into free fatty acids or incorporated into triglycerides.
摘要:
Processes for producing citraconic anhydride and citraconic acid using porous materials with specific surface acidities and surface areas are described. The preferred catalyst is a porous gamma alumina. Itaconic acid is produced from citraconic acid. Itaconic acid is an intermediate to a variety of compounds including polymers.
摘要:
A process for producing a hydrogenation product of aromatic carboxylic acid which comprises continuously producing the hydrogenation product of aromatic carboxylic acid by hydrogenating an aromatic carboxylic acid having a melting point of 250null C. or higher in a solvent in the presence of a solid catalyst, wherein the hydrogenation is conducted in a condition such that substantially the entire amount of the aromatic carboxylic acid of a raw material is dissolved in the solvent by recycling a portion of a reaction liquid taken out of a reactor into the reactor. An aromatic carboxylic acid having a high melting point and hardly soluble in solvents can be hydrogenated at a suitable reaction temperature in accordance with a continuous process without using a great amount of a solvent and the reaction product of the object compound can be produced very efficiently.
摘要:
A process to manufacture conjugated linoleic acid (CLA)-containing materials such as conjugated linoleic salts and acids that are enriched in desirable cis-9, trans-11- and trans-10, cis-12-CLA isomers and are low in certain undesirable isomers. The process generally entails isomerization of an alkyl ester of a linoleic acid-containing material at a temperature typically between about 90 to 140null C. to effectuate conjugation of the double bonds, followed by saponification of the resultant CLA-containing fatty acid ester to produce a CLA-containing fatty acid salt, optionally followed by neutralization of the CLA-containing fatty acid salt with an acid source to produce a CLA-containing fatty acid.
摘要:
The present invention relates to the manufacture of conjugated linoleic acid, and in particular, to dietary supplements, feeds and food products containing conjugated linoleic acid. Accordingly, processes for producing conjugated linoleic acid of high purity and acid value are disclosed. These processes utilize alcoholate catalysts and esters of sunflower oil, safflower oil, or corn oil as the source of linoleic acid. The esters of conjugated linoleic acid produced by the process can be used in animal feeds and in food products suitable for human consumption. Furthermore, the esters can be converted into free fatty acids or incorporated into triglycerides.