Process for preparing 2,2-bis(4-hydroxyphenyl)propane of high pu

Details Process for preparing 2,2-bis(4-hydroxyphenyl)propane of high pu Process for preparing 2,2-bis(4-hydroxyphenyl)propane of high pu

1988-11-28

1990-07-17

Lone, Werren B.

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

Organic compounds

Oxygen containing

568727, 568728, 568750, C07C 3770, C07C 3916

Patent

active

049422650

ABSTRACT:
The process for preparing 2,2-bis(4-hydroxyphenyl)propane (bisphenol A) by reacting acetone with phenol and decomposing the resultant adduct of bisphenol A and phenol is well known. However, the quality of bisphenol A thus obtained is not always satisfactory.
In the process of this invention, the adduct is washed with phenol recovered by decomposing an adduct of bisphenol A and phenol, and then bisphenol A is prepared by decomposing the washed adduct.
The bisphenol A prepared by the process of this invention has an extremely high quality and is suitable for the preparation of polycarbonate used for optical parts.

REFERENCES:
patent: 3049569 (1962-08-01), Apel et al.
patent: 3221061 (1965-11-01), Grover et al.
patent: 4492807 (1985-01-01), Aneja
patent: 4798654 (1989-01-01), Iimura et al.

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