Method for the purification of hexamethyldisiloxane

Details Method for the purification of hexamethyldisiloxane Method for the purification of hexamethyldisiloxane

1982-03-03

1983-01-25

Sever, Frank

Distillation: processes, separatory

With disparate physical separation

203 57, 203 71, 556456, B01D 336

Patent

active

043702040

ABSTRACT:
Process for purifying hexamethyldisiloxane contaminated with toluene or other solvents that cannot be completely separated from the hexamethyldisiloxane by distillation, based on the discovery that hexamethyldisiloxane forms a previously unknown azeotrope with acetonitrile. This azeotrope has a heavier phase that is rich in acetonitrile and a lighter phase that is rich in hexamethyldisiloxane. These phases are mutually immiscible. The azeotrope starts to boil at 71.4.degree. C., which permits the hexamethyldisiloxane to be separated at relatively low temperatures from the impurities. The process involves one or more entrainment distillations in the presence of an excess of acetonitrile and the re-separation of the acetonitrile from the resulting lighter phase by distillation. Two further novel azeotropic systems, one consisting of hexamethyldisiloxane and toluene and the other of acetonitrile and toluene, are provided.

REFERENCES:
patent: 4210496 (1980-07-01), Wong
"Azeotropic Data-III"; Advances in Chemistry Series 116; American Chemical Society; 1973; pp. 202-212.

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