Chemie Linz Gesellschaft M.b.h.

Dsm Chemie Linz Gmbh

Manfred Schoftner

Engelbert Kloimstein

Klaus Reiter

Karl Schermanz

Eduard Perndorfer

Josef Schaller

Carlo Kos

Johann Friedhuber

Rudolf Neuhofer

Process for the preparation of aliphatic or aromatic mono- or dicarboxylic acids of 4 to 22 carbon atoms by oxidation of the corresponding aldehydes having the same number of carbon atoms in a carboxylic acid from the group consisting of formic acid, acetic acid, and propionic acid or in a carboxylic acid/water mixture at a temperature of 50.degree.-130.degree. C. and at 1 to 25 bar and in the presence of an oxidizing agent.

Process for the preparation of mono- or dicarboxylic acids from

Process for the preparation of alpha, omega-alkanedicarboxylic acids of the general formula I ##STR1## in which A is an alkylene radical having 4-14 C atoms by reacting a cycloalkene of the general formula II ##STR2## in which A has the abovementioned meaning with ozone in the presence of an inert solvent, catalytically hydrogenating the peroxide solution formed, followed by oxidation of the dialdehyde formed to the diacid of the formula I in the presence of an inert aprotic solvent.

Process for the preparation of alpha, omega-alkanedioic acids

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Linz, Austria

Manfred Schoftner