Distillation: processes – separatory – Adding material to distilland except water or steam per se – At least two materials
Patent
1989-10-20
1990-11-20
Bascomb, Wilbur
Distillation: processes, separatory
Adding material to distilland except water or steam per se
At least two materials
203 62, 203 78, 203 79, 203 80, 203 84, 203 92, 549541, B01D 340, C07D30102
Patent
active
049716611
ABSTRACT:
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 theoretical stages above the impure propylene oxide feed point; the extractive distillation agent being introduced into the extractive distillation column in the ratio of said feedstock 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 contaminated 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.
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Keating Kenneth P.
Meyer Robert A.
Smith William A.
Steinberg Robert M.
Bascomb Wilbur
Park Jack H.
Priem Kenneth R.
Ries Carl G.
Texaco Chemical Company
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