Process for isolating M-dichlorobenzene from mixtures of dichlor

Details Process for isolating M-dichlorobenzene from mixtures of dichlor Process for isolating M-dichlorobenzene from mixtures of dichlor

1994-09-02

1995-07-25

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

570219, C07C 17392, C07C 2508

Patent

active

054363772

ABSTRACT:
In a particularly advantageous process for isolating m-dichlorobenzene from mixtures of dichlorobenzene isomers by crystallization as eutectic crystals using a processing aid, the processing aid used is a compound of the formula (I) ##STR1## in which R.sup.1 to R.sup.6 are, independently of one another, hydrogen, halogen, C.sub.1 -C.sub.4 -alkyl, hydroxyl, NH.sub.2 or R--CO-- having R=C.sub.1 -C.sub.4 -alkyl,
with 1-bromo-4-chlorobenzene and 1,4-dibromobenzene being excepted.

REFERENCES:
patent: 4873383 (1989-10-01), Kaneshiki et al.
patent: 4996380 (1991-02-01), McCulloch et al.
patent: 5152875 (1992-10-01), Rittner et al.
patent: 5177302 (1993-01-01), Uemasu et al.
patent: 5382725 (1995-01-01), George et al.
Ullmann's Encyclopedia of Industrial Chemistry, vol. A6: Ceramics to Chlorohydrins, pp. 339-340, W. Gerhartz et al., "Chlorinated Hydrocarbons".

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