Separation of m- and p-dichlorobenzene

Details Separation of m- and p-dichlorobenzene Separation of m- and p-dichlorobenzene

1991-04-08

1992-10-06

Manoharan, Virginia

Distillation: processes, separatory

With disparate physical separation

Utilizing removing solid from liquid

203 60, 203 91, 570211, B01D 334, C07C 2508

Patent

active

051528754

ABSTRACT:
A process for separating m- and p-dichlorobenzene by extractive rectification with an extractant and removal of this extractant. Using as extractant an alkylene carbonate of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are identical to or different from one another and each is hydrogen, methyl or ethyl, with the proviso that together the radicals R.sup.1 to R.sup.4 do not contain more than 6 carbon atoms.
The process of the invention makes it possible to separate off the m-isomer in high purity.

REFERENCES:
patent: 2541682 (1951-02-01), Arnold
patent: 3220933 (1965-11-01), Amir et al.
patent: 3847755 (1974-11-01), Chanel et al.
patent: 4300004 (1981-11-01), Wissner et al.
patent: 4488937 (1984-12-01), Berg et al.
patent: 4676872 (1987-06-01), Berg et al.

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