Continuous process for producing polysiloxane oils

Details Continuous process for producing polysiloxane oils Continuous process for producing polysiloxane oils

C - Chemistry, Metallurgy

07

F

260/442

C07F 7/18 (2006.01) C08G 77/08 (2006.01) C08G 77/10 (2006.01)

Patent

CA 1044246

ABSTRACT A continuous process for producing linear di- organopolsiloxanes of a viscosity of from 3 to 50,000 centipoise comprising continuously passing into a first column a feed mixture comprised of cyclic siloxanes, disiloxares, a silanol-stopped linear diorganopolysiloxanes of low molecular weight and triorganosiloxy end-stopped linear diorganipolysiloxcanes of low molecular weight continuously transferring into said first column acid activated hydroaluminum silicate and diatomaceous earth, maintaining said first column at a temperature in the range of 150 to 250°C, continuously removing water from said first column, continuously removing a polysiloxane fluid mixture from said first column and passing it to a second column which is packed with an acid activated hydroaluminum silicate, which second column is maintained at a temperature of 150° to 170°C and continuously trans- ferring from the said second column the desired poly- siloxane product mixed with low boilers, which low boilers can then be continuously separated from the desire poly- siloxanes in a distillation column. The acid activated aluminum silicate is pre- ferably activated with either sulfuric acid or hydrochloric acid and preferably has an acid equivalent of generally 5 to 35 milligrams of KOH per gram and more preferably 15 to 25 milligrams of KOH per gram of hydroaluminum silicate.

211071

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