Use of paired reboilers in the purification of propylene oxide b

Details Use of paired reboilers in the purification of propylene oxide b Use of paired reboilers in the purification of propylene oxide b

1995-08-17

1998-06-30

Manoharan, Virginia

Distillation: processes, separatory

Adding material to distilland except water or steam per se

Organic compound

203 78, 203 80, 203DIG9, 203DIG25, 549541, B01D 340, C07D30132

Patent

active

057728542

ABSTRACT:
In the purification of an aqueous acetone-contaminated propylene oxide feedstock in an extractive distillation column in the presence of an oxyalkylene glycol extractive distillation agent under distillation conditions selected to promote the formation and maintenance of an acetone buffer in the distillation column, a higher boiling (heavier) distillation fraction containing substantially all of the oxyalkylene glycols, water, and acetone introduced into the extractive distillation column is continuously withdrawn and the higher boiling (heavier) distillation fraction is partially vaporized in a first reboiler; the remaining liquid being partially vaporized in a second reboiler and the vapors being recycled to the extractive distillation column.

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patent: 5464505 (1995-11-01), Peters et al.
patent: 5489366 (1996-02-01), Jongenburger

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