Process for separating solutions containing propylene oxide

Details Process for separating solutions containing propylene oxide Process for separating solutions containing propylene oxide

1976-04-28

1978-01-24

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

Plural distillations performed on same material

One a distillation under positive pressure or vacuum

26034837, B01D 310, C07D30102

Patent

active

040702537

ABSTRACT:
Process for separating a solution, which essentially contains propylene oxide, propylene, a carboxylic acid containing 1 to 4 carbon atoms and benzene, by distillation. The solution is fed to a first distillation stage in which propylene, propylene oxide and an amount of the benzene contained in the solution such that the top product from this first distillation contains 20 to 70% by weight of benzene are distilled off over the top at a pressure of 1.0 to 2.5 bars, and in which the carboxylic acid and the remaining benzene are obtained as the sump product. The top product from the first distillation is fed to a second distillation column in which propylene and possibly present small fractions of components which boil lower than propylene oxide are distilled off over the top and a sump product which essentially consists of propylene oxide and benzene is obtained and part of this is returned as reflux to the first distillation column.

REFERENCES:
patent: 3151047 (1964-09-01), Moon et al.
patent: 3350417 (1967-10-01), Binning et al.
patent: 3350418 (1967-10-01), Bowe et al.
patent: 3350419 (1967-10-01), Null et al.
patent: 3654094 (1972-04-01), Yamagishi et al.

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