Process for washing and obtaining solids of slurry

Details Process for washing and obtaining solids of slurry Process for washing and obtaining solids of slurry

1989-02-14

1990-08-21

Lone, Werren B.

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

Organic compounds

Oxygen containing

568749, C07C 4578, C07C 4590, C07C 4581

Patent

active

049508059

ABSTRACT:
A process for washing and obtaining solids of a slurry comprises feeding a slurry containing the adduct of bisphenol A with phenol crystallized from a phenol solution of bisphenol A to a first solid-liquid separator to separate solids from the slurry, transferring the solids separated by the first solid-liquid separator to an agitation tank in which the solids are reslurried, feeding the slurry obtained in the agitation tank to a second solid-liquid separator, said second solid-liquid separator being intended to obtain the solids from the slurry discharged from the agitation tank, and permitting the admission of a washing solvent to wash the solids, and permitting the filtrate and washings to be recovered independently, feeding the washing solvent to the second solid-liquid separator, feeding all of the washings from the second solid-liquid separator to the agitation tank, feeding a part of the filtrate from the second solid-liquid separator to the agitation tank, and discharging the remainder of the filtrate from the system. The process makes it possible to produce a high-purity adduct of bisphenol A with phenol and hence high-purity bisphenol A.

REFERENCES:
patent: 3049568 (1962-08-01), Apel et al.
patent: 3221061 (1965-11-01), Grover et al.
patent: 3936507 (1976-02-01), Ligorati et al.
patent: 4209646 (1980-06-01), Gac et al.
patent: 4300000 (1981-11-01), Reinitz
patent: 4408087 (1983-10-01), Li
patent: 4492807 (1985-01-01), Aneja
patent: 4529823 (1985-06-01), Mendiratta
patent: 4740634 (1988-04-01), Gomes et al.

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