Method for purifying hexamethyldisiloxane

Details Method for purifying hexamethyldisiloxane Method for purifying hexamethyldisiloxane

1988-01-26

1988-09-27

Shaver, Paul F.

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

Organic compounds

Silicon containing

C07F 708

Patent

active

047743468

ABSTRACT:
A method for purifying impure hexamethyldisiloxane comprising as a major portion hexamethyldisiloxane and as a minor portion a mixture of low-boiling organic solvents, other organosilicon compounds, and odor-producing materials is described. The method comprises (A) first, treating the impure hexamethyldisiloxane with a condensation catalyst to convert the organosilicon compounds to additional hexamethyldisiloxane; (B) second, washing the treated impure hexamethyldisiloxane with water; (C) third, separating a water phase from the washed impure hexamethyldisiloxane; (D) fourth, distilling the washed impure hexamethyldisiloxane to yield hexamethyldisiloxane of enhanced purity; (E) fifth, contacting the hexamethyldisiloxane of enhanced purity with acid clay at a temperature of greater than about 50.degree. C.; and (F) finally, contacting the acid clay treated hexamethyldisiloxane of enhanced purity treated in (E) with activated carbon to yield hexamethyldisiloxane with enhanced purity and minimal unpleasant odor.

REFERENCES:
patent: 3493595 (1970-02-01), Strasser et al.
patent: 4127598 (1978-11-01), McEntee
patent: 4156689 (1979-05-01), Ashby et al.
patent: 4210496 (1980-07-01), Wong
patent: 4370204 (1983-01-01), Kotzsch et al.
patent: 4661612 (1987-04-01), George et al.

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