Dr. Frische Gmbh

Frische Gmbh

Katja Hegwein

Rainer Frische

Bernd Best

J&uuml;rgen Volkheimer

Karlheinz Brunner

Rainer Ricker

Joachim Seemann

Barbara Olbrich-Deussner

A method is described for producing saturated dicarboxylic acids with a chain length of C6 to C21 or the corresponding diamidic dicarboxylic acids from fatty acid cleavage of unsaturated fatty acids or the bis-fatty acid diamides of these unsaturated fatty acids by oxidative ozonolysis and subsequent separation and purification of the dicarboxylic acids, whereby after oxidative ozonolysis, the reaction products are dissolved at a high temperature in a carboxylic acid or a mixture of several carboxylic acids with a medium chain length of C6 to C12 or esters of short-chain alcohols of these carboxylic acids as the recrystallization solvent.

Method of producing dicarboxylic acids suitable for synthesis of polymers or polyamides

A process is disclosed for extracting hydrophobic compounds from substantially fat-, oil-, and wax-free substance mixtures by using at least one non-polar extraction solvent in conjunction with at least one water-soluble organic solvent wherein the extraction solvent containing the hydrophobic compound can be recovered as the upper phase in a phase separation.

Process for solvent extraction of hydrophobic compounds

Process for extracting native products which are not water-soluble from

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Reinhelm/Odenwald, Germany

Katja Hegwein