Separation of 2,3-butanediol from propylene glycol by azeotropic

Details Separation of 2,3-butanediol from propylene glycol by azeotropic Separation of 2,3-butanediol from propylene glycol by azeotropic

1989-12-27

1990-06-19

Bascomb, Wilbur

Distillation: processes, separatory

Adding material to distilland except water or steam per se

Organic compound

203 60, 203 62, 203 63, 203 64, 203 69, 568868, B01D 336, C07C 2982

Patent

active

049351028

ABSTRACT:
A complex mixture of polyols cannot be easily separated by atmospheric or reduced pressure distillation because of the closeness of their boiling points. A mixture of polyols can be readily separated by azeotropic distillation. Typical effective agents are: p-xylene for propylene glycol from 2,3-butanediol and 1,2-butanediol; diisobutyl ketone for ethylene glycol from 1,2-butanediol and 1,3-butanediol; dipentene for glycerine from triethylene glycol and 1,2,4-butanetriol; propylene glycol isobutyl ether for 2,3-butanediol from propylene glycol.

REFERENCES:
patent: 2389263 (1945-11-01), Liebmann et al.
patent: 2865819 (1958-12-01), Hagemeyer et al.
patent: 3809724 (1974-05-01), Golden
patent: 4021311 (1977-05-01), Becker
patent: 4057471 (1977-11-01), Chueh

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