Method for purifying hexamethyldisiloxane

Details Method for purifying hexamethyldisiloxane Method for purifying hexamethyldisiloxane

C - Chemistry, Metallurgy

07

F

260/449

C07F 7/18 (2006.01) C07F 7/20 (2006.01)

Patent

CA 1316543

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 hexamethyl- disiloxane of enhanced purity with acid clay at a temper- ature of greater than about 50°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.

557943

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