Distillation process for recovery of hexamethyl disiloxane

Details Distillation process for recovery of hexamethyl disiloxane Distillation process for recovery of hexamethyl disiloxane

1978-06-07

1980-07-01

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

With disparate physical separation

Utilizing liquid-liquid extracting of distillation product

203 44, 203 58, 203 63, 203 69, 556456, B01D 336, C07F 720

Patent

active

042104963

ABSTRACT:
There is disclosed an azeotropic distillation process for separating and recovering hexamethyl disiloxane (HMDO) from toluene in a spent liquor mixture. An HMDO azeotrope former, pyrrolidone, is added to the liquor. The pyrrolidine is added in an amount of at least about 1.81 parts by weight per 1.0 part by weight of HMDO. Preferably, it is added in excess, as about 2.7 to about 5.4 parts by weight of pyrrolidine per 1.0 part by weight of HMDO. The resulting azeotrope of HMDO and pyrrolidine is then separated by distillation from the liquor. The pyrrolidine may be subsequently recovered from the HMDO by extraction with water. Other HMDO azeotrope formers, such as tertiary butanol, may also be utilized.

REFERENCES:
patent: 2439777 (1948-04-01), Lake et al.
patent: 3803195 (1974-04-01), Nitzsche et al.

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