Henkel Corporation

Henkel Kommanditgesellschaft Auf Aktien

Cognis IP Management Gmbh

Kenneth R McVay

Dennis G Gaige

William S Kain

Richard G Fayter

Wilhelm Johannisbauer

Kevin W Anderson

J Douglas Wenzel

Horst Josten

Manfred Lindemann

Pure azelaic acid is obtained by working up a reaction mixture containing C.sub.1-18 monocarboxylic acids, mainly pelargonic acid, and C.sub.4-16 dicarboxylic acids, mainly azelaic acid, obtained from the ozonolysis of oleic acid or a starting mixture containing oleic acid. All but &lt;2% by weight of the monocarboxylic acids and part of the dicarboxylic acids with a chain length of &lt;C.sub.9 and &gt;C.sub.9 are separated off to obtain a prepurified product containing more than 75% by weight of oleic acid and the prepurified product is concentrated to more than 90% by weight of oleic acid in several process steps. In a first process step (1), the dicarboxylic acids with chain lengths of &lt;C.sub.9 present in the prepurified product are removed as first runnings by fractional distillation. In a second process step (2), the bottom product obtained is reacted with water to split carboxylic anhydrides present in the bottom product. In a third process step (3), the reaction mixture is subjected to overhead distillation. The third process step (3) is carried out after or at the same time as the second process step (2). The product yield is improved. The process is particularly suitable for working on an industrial scale.

Process for concentrating azelaic acid

Aliphatic polycarboxylic acids are made by a process comprising the steps of: (1) fermenting a beta-oxidation blocked C. tropicalis cell wherein both copies of the chromosomal POX5 gene and the chromosomal POX4A and POX4B genes are disrupted in a culture medium comprised of a nitrogen source, an organic substrate and a cosubstrate wherein the substrate is an unsaturated aliphatic compound having at least one internal carbon--carbon double bond and at least one terminal methyl group, a terminal carboxyl group and/or a terminal functional group which is oxidizable to a carboxyl group by biooxidation; (2) reacting the product of step (1) with an oxidizing agent to produce one or more polycarboxylic acids.

Process for making polycarboxylic acids

The present invention is a process for the scission and oxidation of ozonide materials. The process comprises introducing an oxygen-containing gas stream into an agitated liquid body in the form of fine bubbles.

Method for forming two terminal carboxylic acid groups from an ozonide

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Hamilton, OH, United States of America

Kenneth R McVay