Process for preparing a bisphenol

Details Process for preparing a bisphenol Process for preparing a bisphenol

1990-11-15

1992-04-14

Lone, Werren B.

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

Organic compounds

Oxygen containing

568722, 568723, 568724, 568728, C07C 3720, C07C 3916

Patent

active

051050269

ABSTRACT:
The present disclosure is directed to improving purity of a bisphenol product in a bisphenol by-product isomerization process wherein isomers of bisphenol are isomerized to the desired bisphenol product. During the isomerization, acidic resin fines elute from the acidic ion exchange resin catalyst into the reaction effluent. These resin fines can be filtered effectively and without contamination by a bed of solid particles such as alumina or carbon. The removal of resin fines improves the product quality and yield by eliminating resin particulates and reducing acid catalyzed cracking of bisphenols during purification and finishing steps.

REFERENCES:
patent: 4169211 (1979-09-01), Ligorati et al.
patent: 4469561 (1984-09-01), Sikdar et al.
patent: 4766254 (1988-08-01), Faler et al.
patent: 4822923 (1989-04-01), Li
patent: 4825010 (1989-04-01), Li
patent: 5001281 (1991-05-01), Li

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