Process for continuous purification of bisphenols

Details Process for continuous purification of bisphenols Process for continuous purification of bisphenols

1988-12-16

1990-05-22

Lone, Werren B.

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

Organic compounds

Oxygen containing

568729, 568749, C07C 3784, C07C 3768

Patent

active

049279734

ABSTRACT:
A process for the continuous purification of crude bisphenol which comprises (1) forming a single liquid phase comprising a hot mixture of crude bisphenol and water in a ratio substantially of from about 75% to about 85% weight of crude bisphenol to about 15% to about 25% weight water; (2) continuously feeding this mixture together with a stream of warm water to a first crystallization zone at a temperature sufficient to maintain a bisphenol-rich liquid phase, a water-rich phase and a crystalline phase comprising about 70% to about 95% of the total bisphenol in the mixture; (3) passing the three-phase mixture of bisphenol and water to a second crystallization zone operated at about 85.degree. C. to about 97.degree. C. until about 90% to about 99% of the total bisphenol is crystallized; and (4) recovering the purified bisphenol crystals.

REFERENCES:
patent: 3326986 (1967-06-01), Dugan et al.
patent: 4408087 (1988-10-01), Li
patent: 4529823 (1985-07-01), Mendiratta

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