Process for preparing bisphenol A

Details Process for preparing bisphenol A Process for preparing bisphenol A

1988-11-28

1990-04-17

Lone, Werren B.

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

Organic compounds

Oxygen containing

568722, 568723, 568738, C07C 3720, C07C 3916

Patent

active

049182455

ABSTRACT:
This invention is a process for the preparation of bisphenol A from acetone and phenol. By this invention, the formation of by-products is extremely decreased and post treatment steps can be simplified.
This invention involves the following steps. (1) One mole of acetone is reacted with 4 to 12 moles of phenol in the presence of a sulfonic acid type cation exchange resin catalyst modified with a mercapto group-containing compound such as mercaptoethylamine to convert 20 to 60% of acetone, and (2) the reaction mixture containing unreacted acetone is successively reacted to the presence of the hydrochloric acid catalyst.
The formation of by-products such as 2-(2-hydroxyphenyl)-2-(4-hydroxyphenyl)propane, Dianin's compound and the like is remarkably reduced by the process of this invention.

REFERENCES:
patent: 2359242 (1944-09-01), Perkins et al.
patent: 3172916 (1965-03-01), Wagner
patent: 3221061 (1965-11-01), Grover et al.
patent: 4188496 (1980-02-01), Jaquiss et al.
patent: 4308404 (1981-12-01), Kwantes et al.
patent: 4584416 (1986-04-01), Pressman et al.

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