Process for producing octamethylcyclotetrasiloxane

Details Process for producing octamethylcyclotetrasiloxane Process for producing octamethylcyclotetrasiloxane

1979-03-05

1980-04-08

Shaver, Paul F.

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

Organic compounds

Silicon containing

C07F 708

Patent

active

041972511

ABSTRACT:
Octamethylcyclotetrasiloxane can be produced from dimethylsiloxane effectively by suppressing the by-production of undesirable other siloxanes by reacting dimethylsiloxane in the presence of an alkaline catalyst, an inert solvent and recycled by-produced cyclic dimethylsiloxanes containing at least hexamethylcyclotrisiloxane in a reactor, while distilling volatile cyclic dimethylsiloxanes produced, said recycled by-produced cyclic dimethylsiloxanes containing at least hexamethylcyclotrisiloxane having been separated from the volatile cyclic dimethylsiloxanes by recovering octamethylcyclotetrasiloxane and recycled to the reactor.

REFERENCES:
patent: 3842110 (1974-10-01), Razzano
patent: 3989733 (1976-11-01), Okamoto et al.

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