Henkel Kommanditgesellschaft Auf Aktien

Cognis Deutschland Gmbh & Co. Kg

Manfred Lindemann

Wilhelm Johannisbauer

Lutz Jeromin

Reinhold Sedelies

Kenneth R McVay

Horst Josten

Dennis G Gaige

Karl-Heinz Buettgen

Guenter Wozny

Gerhard Dieckelm

Daniela Prinz

Gerd Matrong

Deacidified fats and/or oils are made by the process which comprises the steps of:

Process for the production of deacidified triglycerides

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

Process for the acid-catalyzed hydrolysis of fatty acid glycerides, wherein the process is carried out continuously with the glyceride and the water being moved countercurrent to each other, and apparatus therefor.

Process for the acid-catalyzed cleavage of fatty acid glycerides and

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Manfred Lindemann