Process for production of 2,2-bis(4-hydroxyphenyl) propane

Details Process for production of 2,2-bis(4-hydroxyphenyl) propane Process for production of 2,2-bis(4-hydroxyphenyl) propane

1983-09-26

1985-05-14

Lone, Werren B.

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

Organic compounds

Oxygen containing

C07C 3916

Patent

active

045173877

ABSTRACT:
A process for continuously producing 2,2-bis(4-hydroxyphenyl) propane having a high quality from a reaction of phenol and acetone in the presence of a hydrochloric acid containing catalyst comprising the steps of:
(A) carrying out the reaction by continuously charging additional phenol, the below-mentioned circulating phenol, additional acetone, additional hydrogen chloride or hydrochloric acid, the below-mentioned circulating oily mother liquor, and the below-mentioned aqueous mother liquid into a reactor to form a reaction mixture slurry comprising the crude phenol adduct of 2,2-bis(4-hydroxyphenyl) propane in the form of crystal and two liquid phase reaction mother liquors of an oily mother liquor and an aqueous mother liquor;
(B) separating the reaction mixture slurry into the crude phenol adduct of 2,2-bis(4-hydroxyphenyl) propane and the two liquid phase mother liquors after discharging the reaction mixture slurry from the reactor;
(C) separating the two liquid phase mother liquors obtained in the above-mentioned step (B) into the oily mother liquor and the aqueous mother liquor, whereby the oily mother liquor is circulated as a circulating oily mother liquor to the reactor and the remaining portion of the aqueous mother liquor, after discharging a portion thereof, is circulated as a circulating aqueous mother liquor to the reactor;
(D) dissolving the crude phenol adduct of 2,2-bis(4-hydroxyphenyl) propane obtained in the above-mentioned step (B) in a phenol solvent and, after neutralizing the hydrogen chloride or hydrochloric acid contained in the crude phenol adduct with a base, crystallizing and separating the phenol adduct of 2,2-bis(4-hydroxyphenyl) propane from the solution to obtain the purified phenol adduct of 2,2-bis(4-hydroxyphenyl) propane;
(E) decomposing the purified phenol adduct of 2,2-bis(4-hydroxyphenyl) propane obtained in the above-mentioned step (D), on heating, to form a thermally decomposed product containing phenol and 2,2-bis(4-hydroxyphenyl) propane;
(F) recovering the phenol and 2,2-bis(4-hydroxyphenyl) propane from the thermally decomposed product obtained in the above-mentioned step (E); and
(G) circulating the phenol recovered in the above-mentioned step (F) to the reactor in the above-mentioned step (A) as a circulating phenol or to the above-mentioned step (D) as a phenol solvent.

REFERENCES:
patent: 2730552 (1956-01-01), Williamson
patent: 2791616 (1957-05-01), Luten
patent: 2923744 (1960-02-01), Scriabine et al.
patent: 2936272 (1960-05-01), Bender et al.
patent: 3264357 (1966-08-01), Webb et al.
patent: 3418378 (1968-12-01), MacNaughton et al.
patent: 4192955 (1980-05-01), Reinitz
patent: 4317944 (1982-05-01), Davis
patent: 4408087 (1983-01-01), Li

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