Wacker-chemie Gmbh

Helmut Spork

Rudolf Strasser

Rudolf Riedle

Johann Waas

Volker Frey

Peter John

Wolfgang Jacques

Gerhard Kalchgruber

Robert Leser

An improved process for converting organopolysiloxane polymers which comprises reacting halosilanes which organopolysiloxanes in the presence of activated charcoal and if desired, an inorganic acid.

Preparation of organopolysiloxane polymers

A water-miscible organic solvent is recovered from a mixture containing the solvent and water by adding an inert compound which is immiscible with the water and has a vapor pressure of no more than 5 mm Hg (abs.) at 100.degree. C. to the mixture and thereafter distilling off the organic solvent.

Process for recovering water-miscible solvents

An improved process for preparing organosiloxanes and alkyl halides by passing organohalosilanes and alkanols having 1 and/or 2 carbon atoms through at least one layer of packing material which is maintained at a temperature of from 60.degree. to 150.degree. C, the improvement which comprises (1) recycling from 1 to 6 liters of an aqueous phase separated from the organosiloxanes emerging from the layer or layers of packing material for each mol of organohalosilane introduced into the layer or layers of packing material and (2) reacting the organosiloxane separated from the aqueous phase with from 2 to 10 percent by weight based on the weight of the organosiloxane with the same organohalosilane which is passed through the layer or layers of packing material.

Process for preparing organosiloxanes

Growing community of inventors

Altotting, Germany

Helmut Spork