Plural stage purification of propylene oxide

Details Plural stage purification of propylene oxide Plural stage purification of propylene oxide

C - Chemistry, Metallurgy

07

D

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

Patent

CA 2102853

PLURAL STAGE PURIFICATION OF PROPYLENE OXIDE ABSTRACT OF THE DISCLOSURE Impure 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 second column into a second overhead fraction comprising most of the pentanes, pentenes and oxygen-containing impurities and a partially purified propylene oxide bottoms fraction comprising propylene oxide, hexenes, hexanes, and only residual quantities of pentenes and pentanes, (c) wherein the partially purified bottoms fraction is extractively distilled in a third column using a C7-C10 alkane hydrocarbon extractive distillation agent to provide a further purified bottoms fraction containing substantially all of the propylene oxide, hexenes, hexanes charged to the third distillation column, and (d) the further purified bottoms fraction is extractively distilled in a fourth column using a C7 to C10 alkane hydrocarbon extractive distillation agent to provide a purified propylene oxide overhead fraction consist- ing essentially of propylene oxide.

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