Process for separating dihydric phenols

Details Process for separating dihydric phenols Process for separating dihydric phenols

1982-04-26

1984-01-03

Lone, Werren B.

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

Organic compounds

Oxygen containing

568750, 568766, C07C 3768

Patent

active

044243812

ABSTRACT:
A process is disclosed for separating closely-boiling dihydric phenol compounds by treating a mixture of dihydric phenols with a metal halide salt. The metal halide salt preferentially forms a complex with one of the dihydric phenols over other related dihydric phenols in the mixture. The preferentially-formed complex of one of the dihydric phenols may then be isolated from the mixture and the complex decomposed to provide a product substantially enriched in, or substantially entirely composed of, one dihydric phenol. The process is particularly suitable for resolving a mixture comprising hydroquinone and catechol, or a mixture of hydroquinone and resorcinol, or a mixture of homocatechol and hydroquinone, or a mixture of catechol and resorcinol.

REFERENCES:
patent: 3981929 (1976-09-01), Davis et al.
patent: 4267389 (1981-05-01), Leston
patent: 4267390 (1981-05-01), Leston
patent: 4267391 (1981-05-01), Leston
patent: 4267392 (1981-05-01), Leston
Sharpless et al., "J. Org. Chem.", vol. 40, (1975), pp. 1252-1257.

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