Purification of bisphenol-A

Details Purification of bisphenol-A Purification of bisphenol-A

1984-04-02

1985-07-16

Lone, Werren B.

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

Organic compounds

Oxygen containing

568748, 568749, C07C 3784

Patent

active

045298238

ABSTRACT:
This invention is directed to a method of purifying crude bisphenol-A by crystallization with agitation in phenolic water having less than 30 weight percent phenol. The crystals obtained have a morphology similar to that of aqueous crystallized bisphenol-A with a significantly higher degree of purity than crystals obtained from an aqueous crystallization. The use of an organic solvent, foreign to the bisphenol-A synthesis reaction, for either washing or crystallization can be avoided and only small quantities of phenol and water are required when providing pure bisphenol-A for polycarbonate synthesis by this process.

REFERENCES:
patent: 2791616 (1957-05-01), Luten, Jr.
patent: 3192270 (1965-06-01), Meyer et al.
patent: 3326986 (1967-06-01), Dugan et al.
patent: 4192955 (1980-03-01), Reinitz
patent: 4209646 (1980-06-01), Gac et al.
patent: 4467119 (1984-08-01), Thomas

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