Hoechst Aktiengesellschaft

Helmut Schaum

Gunter Roscher

Hans-Jurgen Arpe

Hansjorg Hey

Hartmut Voigt

Heinz Schmitz

Rudolf Sartorius

Friedrich Schenk

A process is provided for the preparation of practically formic acid-free acetic acid by oxidation of acetaldehyde in the liquid phase with oxygen or oxygen-containing gases in the presence of mixtures of cobalt, nickel and manganese salts as catalysts.

Process for the preparation of practically formic acid-free acetic acid

A process for the removal of formic acid from a crude mixture thereof with carboxylic acids by reacting the formic acid component of the mixture with a carboxylic anhydride and/or a compound forming an anhydride with a carboxylic acid, which comprises carrying out the reaction in the presence of an acidic catalyst.

Process for the purification of carboxylic acids

Process for preparing acetic acid by oxidation of acetaldehyde with oxygen or oxygen containing gases in the presence of a catalyst based on manganese acetate, wherein the crude acetic acid and the gases formed, still containing acetaldehyde, are submitted to an after-oxidation, the low-boiling substances are distilled off and the residue is reused as catalyst.

Process for preparing acetic acid

Growing community of inventors

Bad Soden am Taunus, Germany

Helmut Schaum