Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
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:
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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
Davis Jr. James C.
General Electric Company
Lone Werren B.
Magee Jr. James
Traverso Richard J.
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