Process for preparation of cyclic organohydrosiloxanes

Details Process for preparation of cyclic organohydrosiloxanes Process for preparation of cyclic organohydrosiloxanes

1992-08-31

1993-02-23

Shaver, Paul F.

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

Organic compounds

Silicon containing

C07F 708

Patent

active

051891930

ABSTRACT:
The present invention is a process for preparation of cyclic organohydrosiloxanes. The process comprises contacting an organohydrodihalosilane with a substantially stoichiometric quantity of water to form a mixture containing cyclic and short-chain linear organohydrosiloxanes. This mixture is distilled to separate the cyclic and short-chain linear organohydrosiloxanes from other components of the mixture. The separated cyclic and short-chain linear organohydrosiloxanes are then contacted with an additional quantity of water to effect hydrolysis and condensation of the short-chain linear organohydrosiloxanes to higher molecular weight linear organohydrosiloxanes which are easily separated from the cyclic organohydrosiloxanes by a second distillation step.

REFERENCES:
patent: 3484468 (1969-12-01), Curry
patent: 3714213 (1973-01-01), Miller et al.
patent: 4539418 (1985-09-01), Takago et al.
patent: 4895967 (1990-01-01), Givello et al.
Sauer et al., J. Am. Chem. Soc. 68:962 (1946).

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