Bayer Aktiengesellschaft

Bayer Antwerpen

Georg Spott

Dieter Freitag

Manfred Schmidt

Domien Sluyts

Gabriel Denecker

Gerd Goldmann

Eberhard Bandtel

Roland Putseys

Willy Van Herck

Christian Frohlich

Walter Traudisch

Ludo Claes

The continuous process makes it possible to reduce the water content of polymers to minor residual levels (ppm) by adding to a W/O-emulsion an extractant which is subsequently evaporated with the oil.

Continuous process for the concentration of W/O-emulsions by evaporation

A process for the working up of ammonium sulphate-containing effluent which is contaminated with organic compounds and optionally also ammonium nitrate, comprising evaporating the effluent to produce water vapor which is removed, a concentrated liquid and a crystal suspension, thickening the suspension to obtain solid ammonium sulphate which is removed and liquid which is recycled to an earlier stage, subjecting the concentrated liquid from evaporation to an optional vacuum cooling crystallization to obtain water vapor which is removed and a crystal suspension from which a concentrated liquid is separated off, advancing the concentrated liquid from the evaporation stage or from the vacuum cooling crystallization stage to a crystallizer, introducing ammonia into the crystallizer to decrease the solubility of the ammonium sulphate, thickening the ammoniacal crystal suspension to obtain ammonium sulphate solids which are removed and ammoniacal mother liquor which is advanced to a distillation step for recovery of ammonia.

Process for working up effluent containing ammonium sulphate

Boron containing phenol/formaldehyde resins can be isolated from their reaction media by evaporating said resins in a spiral flow evaporator which has a ratio between throughput and tube cross section from 0.1 to 1.5 and a ratio between throughput and evaporation surface from 100 to 400.

Process for isolating boron-containing phenol/formaldehyde resins

Growing community of inventors

Krefeld, Germany

Georg Spott