B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
202/68
B01D 3/40 (2006.01) C07D 301/32 (2006.01) C07D 303/04 (2006.01)
Patent
CA 2027824
PURIFICATION OF PROPYLENE OXIDE USING AN AQUEOUS ACETONE EXTRACTIVE DISTILLATION AGENT (Docket No. 80,739-F) ABSTRACT OF THE DISCLOSURE An impure propylene oxide feedstock contaminated with from about 50 to about 1000 ppm of methanol and from about 0 to about 1 wt.% of acetone is charged to the lower half of an extractive distillation column containing at least about 25 theoretical plates and an extractive distillation agent consisting essentially of a blend of acetone and water (acetone/water blend) containing about 20 to about 30 wt.% of acetone and, correspondingly, about 80 to about 70 wt.% of water is charged to the tower at a point 4 to 7 theoreti- cal stages above the impure propylene oxide feed point; the extractive distillation agent being introduced into the extractive distillation column in the ratio of said feed- stock to said extractive distillation agent of from about 5:1 to about 20:1, whereby an overhead distillate fraction is obtained consisting essentially of propylene oxide con- taminated with not more than about. 60 ppm of methanol, not more than about 0.02 wt.% of acetone and not more than about 0.3 wt.% of water.
Keating Kenneth P.
Meyer Robert A.
Smith William A.
Steinberg Robert M.
Huntsman Specialty Chemicals Corporation
Smart & Biggar
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