Process for separating isomer mixtures of 1,3- and 1,4- bis-(2-h

Details Process for separating isomer mixtures of 1,3- and 1,4- bis-(2-h Process for separating isomer mixtures of 1,3- and 1,4- bis-(2-h

1987-07-21

1988-10-18

Lacey, David L.

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

203 48, 203 79, 203 80, 203 96, 203DIG6, 568810, 568811, B01D 338

Patent

active

047785683

ABSTRACT:
Isomer mixtures of 1,3- and 1,4-bis-(2-hydroxyhexafluoroprop-2-yl)-benzene are separated by a steam distillation in the presence of CS.sub.2. On cooling of the steam distillate, a solid precipitates which is composed mainly of the 1,4-isomer. After the solid has been separated off, an aqueous-organic liquid-phase mixture remains, the organic phase of which mainly contains the 1,3-isomer. The pure isomers are obtained by recrystallization or distillation respectively. These are mainly intermediates in the polymer field.

REFERENCES:
patent: 2674569 (1954-04-01), Burrage et al.
patent: 3236894 (1966-02-01), England
patent: 3304334 (1967-02-01), Jones
patent: 3879430 (1975-04-01), O'Rear et al.
Sepiol, J. et al., J. Fluorine Chem. 24, 61-74 (1984).
Farah, B. S. et al., J. Org. Chem. 30, 998-1001 (1965).

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