Hoechst Aktiengesellschaft

Wolf-Dietmar Kaufmann

Bernd Laugwitz

Gunter Roscher

Ernst I Leupold

Heinz Litterer

Ulrich Meyer-Blumenroth

Hans-Dietmar Schnabel

Axel Engelmann

Gunther Duchatsch

Process for the preparation of the non-toxic salts of

Process for the recovery of catalyst in the production of ether carboxylic acids by catalytic oxidation with a suspended ether catalyst in which the reaction mixture is subjected to cross-flow filtration.

Process for catalyst recovery

Process for the continuous preparation of dialkyl vinylphosphonates using catalysts at temperatures of from 150.degree. to 270.degree. C. by dissociation of dialkyl acetoxyethanephosphonates at a pressure of from 5 to 500 mbar in contact with a liquid, catalytically active medium while drawing off the dialkyl vinylphosphonates formed and other volatile reaction products as vapors, by conveying the liquid medium in forced circulation via an evaporator while feeding in fresh dialkyl acetoxyethanephosphonate, if desired admixed with catalyst, corresponding to the distillation of dialkyl vinylphosphonates and other volatile compounds, and drawing off non-volatile material formed as byproduct from the liquid circuit to maintain constant conditions.

Process for preparing dialkyl vinylphosphonates

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Kronberg, Germany

Wolf-Dietmar Kaufmann