Process for the purification of bisphenol A

Details Process for the purification of bisphenol A Process for the purification of bisphenol A

1975-05-07

1976-08-03

Morgenstern, Norman

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 3722

Patent

active

039729508

ABSTRACT:
Crude 2,2-bis(4-hydroxyphenyl)propane containing impurities such as 2-(2-hydroxyphenyl)-2-(4-hydroxyphenyl)propane is purified by first dissolving the crude material in a polyhydroxy solvent then adding water and an ether having a boiling point less than 110.degree.C whereby the ether extracts the 2,2-bis(4-hydroxyphenyl)propane. The ether-2,2-bis(4-hydroxyphenyl)propane extract is then distilled in the presence of toluene wherein the toluene-2,2-bis(4-hydroxyphenyl)propane bottoms product is separated and cooled to form a purified 2,2-bis(4-hydroxyphenyl)propane precipitate which is subsequently recovered.

REFERENCES:
patent: 2959622 (1960-11-01), Gimme et al.
patent: 3207795 (1965-09-01), Prahl et al.
patent: 3290391 (1966-12-01), Prahl et al.
patent: 3326986 (1967-06-01), Dugan et al.
patent: 3493622 (1970-02-01), Ornsten et al.
patent: 3535389 (1970-10-01), DeJong

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