Separation of 3,4-dichloroaniline

Details Separation of 3,4-dichloroaniline Separation of 3,4-dichloroaniline

1982-08-06

1983-10-11

Doll, John

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

Organic compounds

Amino nitrogen containing

564442, 564497, C07C 8526

Patent

active

044093861

ABSTRACT:
An acid extraction process for separating 3,4-dichloroaniline from 2,3-dichloroaniline and 2,5-dichloroaniline is disclosed. The process involves selectively forming 3,4-dichloroaniline hydrochloride, since it has a higher basicity than the other dichloroaniline isomers, in a multiple stage extraction unit. An aqueous solution of 3,4-dichloroaniline hydrochloride is removed from the multiple stage extraction unit and neutralized with a base to form an immiscible mixture of an aqueous salt solution and 3,4-dichloroaniline which are separated by decantation.

REFERENCES:
patent: 1942838 (1934-01-01), Semon
patent: 2408975 (1946-10-01), Engel
patent: 3251880 (1966-05-01), Gentry
patent: 4174351 (1979-11-01), Shoffner
"Dissociation Extraction Part 1: General Theory", Anwar et al., Trans. Instn. Chem. Engrs., vol. 49, (1971).
"Separation of Close Boiling Substituted Phenols by Dissociation Extraction", Wadekar et al., J. Chem. Tech. Biotechnol 31, pp. 279-284 (1981).

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