Process for the production of linear organohydrogensiloxanes
AssigneeGeneral Electric Company
InventorsLuisito A. Tolentino, Akber Ali Khanshab
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Abstract
A process for preparing linear organohydrogensiloxanes. The process comprises contacting an organohydrogendichlorosilane in the presence of trimethylchlorosilane with water to form an M-stopped hydrolyzate. The hydrolyzate is optionally preheated prior to being contacted with an acidic rearrangement catalyst to effect formation of linear organohydrogensiloxanes. The linear organohydrogensiloxanes are separated from cyclic organohydrogensiloxanes and recovered. The cyclic organohydrogensiloxanes may then be recycled to the process for further contact with the acidic rearrangement catalyst for maximum overall conversion rate.
Claims13
A process for preparing linear organohydrogensiloxanes, the process comprising:
- (A) contacting a silane of the formula RHSiCl2 with water in the presence of trimethylchlorosilane to form an M-stopped hydrolyzate comprising cyclic organohydrogensiloxanes and linear organohydrogensiloxanes,
- (B) contacting the hydrolyzate with an acidic rearrangement catalyst at a temperature of about 65° C. or less thereby increasing the ratio of the linear organohydrogensiloxanes to the cyclic organohydrogensiloxanes, and
- (C) separating the linear organohydrogensiloxanes from the cyclic organohydrogensiloxanes;
- where R is selected from a group consisting of saturated monovalent hydrocarbon radicals comprising one to 12 carbon atoms and aryl radicals.
A process according to claim 14, where the acidic rearrangement catalyst is a sulfonated divinylbenzenestyrene copolymer resin.
Dependencies are inferred from the claim text.