Wacker Chemie Ag

Josef Fuerst

Johann Schuster

Nils Becker

Stefan Dietl

Dieter Duschl

Norbert Hiltl

Dominik Becher

Sabrina Von Bein

Werner Fuchs

Volatile siloxanes, particularly those of a cyclic nature, are removed from high viscosity silicone polymers and high viscosity silicone compositions by evaporation in a short path evaporator.

Devolatization of highly viscous silicone fluids in the short path evaporator

Organosilicon compounds in a process exhaust stream from silicone production are removed by contacting the exhaust stream with a semipermeable silicone membrane which is selectively permeable to organosilicon compounds and oxygen relative to nitrogen. The pressure on the permeate side of the membrane is preferably less than the pressure on the retentate side.

Continuous process for cleaning process waste air obtained in the production of silicones

Organopolysiloxane compositions are prepared with high throughput and less process time, by a process in which organopolysiloxanes, processing aids and fillers are mixed and kneaded in the presence of water to give raw mixtures and the raw mixtures are subsequently devolatilized and freed of water in a heating and devolatilizing step at temperatures in the range from 100&#xb0; C. to 250&#xb0; C.

Process for producing organopolysiloxane compositions

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Mehring, Germany

Josef Fuerst