Plural stage drying and purification of propylene oxide

Details Plural stage drying and purification of propylene oxide Plural stage drying and purification of propylene oxide

C - Chemistry, Metallurgy

07

D

C07D 303/04 (2006.01) B01D 3/14 (2006.01) B01D 3/40 (2006.01) C07D 301/32 (2006.01)

Patent

CA 2129072

PLURAL STAGE DRYING AND PURIFICATION OF PROPYLENE OXIDE (Docket No. 81,182-F) ABSTRACT OF THE DISCLOSURE Crude propylene oxide is purified by a distillation process wherein it is (a) extractively distilled in a first column using a C2 to C6 alkylene glycol extractive distilla- tion agent to form a first overhead fraction comprising propylene oxide, C5-C7 hydrocarbons, methanol, water and oxygen-containing impurities, (b) wherein the first overhead fraction is separated in a plurality of intermediate distilla- tion columns to provide an intermediate propylene oxide overhead fraction consisting essentially of propylene oxide and water, and (c) the intermediate propylene oxide overhead fraction is charged to a final distillation column using a C2 to C6 alkylene glycol extractive distillation agent to form a final overhead fraction consisting essentially of propylene oxide.

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