Preparation of cyclopolydiorganosiloxanes via vapor phase rearra

Details Preparation of cyclopolydiorganosiloxanes via vapor phase rearra Preparation of cyclopolydiorganosiloxanes via vapor phase rearra

1988-01-15

1988-08-16

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

C07F 708

Patent

active

047646314

ABSTRACT:
A process for preparing a product cyclopolydiorganosiloxane, (R.sub.2 SiO).sub.c. The process comprises (A) vaporizing a feed cyclopolydiorganosiloxane material, (R.sub.2 SiO).sub.x ; (B) passing the vapors from (A) through a heated bed of a solid catalyst, the catalyst comprising an alkali metal compound; (C) controlling pressure and temperature in the heated catalyst bed to favor formation of (R.sub.2 SiO).sub.c in an equilibrating mixture with other cyclopolydiorganosiloxanes; and (D) recovering an amount of the product cyclopolydiorganosiloxane, (R.sub.2 SiO).sub.c, which is substantially increased from the amount present in the feed cyclopolydiorganosiloxane material.

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