Process for preparing bisphenol A

Details Process for preparing bisphenol A Process for preparing bisphenol A

1989-02-14

1990-08-21

Lone, Werren B.

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

Organic compounds

Oxygen containing

C07C 3720, C07C 3770, C07C 3916

Patent

active

049508040

ABSTRACT:
A process for producing high-purity bisphenol A comprises reacting phenol with acetone in the presence of hydrochloric acid as the catalyst to obtain a product mixture, removing the hydrochloric acid from the product mixture, thereby yielding a liquid mixture, adding water to the liquid mixture, evaporating a water-phenol mixture from the liquid mixture under reduced pressure, thereby cooling the liquid mixture and crystallizing out the adduct of bisphenol A with phenol, and finally recovering bisphenol A from the adduct, wherein an improvement comprises treating the water-phenol mixture with a weakly basic ion-exchange resin and recycling and reusing the treated mixture as the water to be added to the liquid mixture. This process does not causes any troubles such as the corrosion of equipment and the decomposition and discoloration of bisphenol A during distillation.

REFERENCES:
patent: 3073868 (1963-01-01), Prahl et al.
patent: 3221061 (1965-11-01), Grover et al.
patent: 4191843 (1980-03-01), Kwantes
patent: 4364099 (1982-12-01), Faler
patent: 4443653 (1984-04-01), McLaughlin
Patent Abstracts of Japan, vol. 7, no. 248 (C-193)(1393), Nov. 4th, 1983; JP-A-58-135832 (MITSUI TOATSU) 12-08-83.

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