Process for preparing high-purity bisphenol A

Details Process for preparing high-purity bisphenol A Process for preparing high-purity bisphenol A

1989-03-09

1990-09-04

Lone, Werren B.

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

Organic compounds

Oxygen containing

568724, 568722, 568728, C07C 3720, C07C 3784, C07C 3916

Patent

active

049546619

ABSTRACT:
A method for preparing high-purity bisphenol A which comprises a principal process comprising a first reaction step for reacting phenol with acetone, a first concentration adjusting step, a first crystallization step for precipitating crystals of the adduct of bisphenol A with phenol, a first separation step for separating a solution containing the crystals of the adduct into the crystals and the mother liquor and a phenol removing step for removing phenol from the crystals of the adduct; and a sub-process comprising a second reaction step for reacting p-isopropenylphenol with phenol, a second concentration adjusting step, a second crystallization step, a second separation step for separating a solution containing the second any crystals of the adduct into the second any crystals and the second mother liquor and a cleaving step, the first mother liquor from the principal process being fed to the sub-process and the second any crystals of the adduct from the sub-process being fed to the principal process, is herein provided.
In addition, a method for preparing high-purity bisphenol A which comprises a principal process comprising a first reaction/catalyst removing step for reacting phenol with acetone and removing the catalyst, a crystallization step for precipitating the adduct of bisphenol A with phenol, a solid-liquid separation step for separating the reaction solution into the crystals of the adduct and the mother liquor and a phenol removing step for removing phenol from the adduct crystals; and a sub-process comprising a second reaction/catalyst removing step for reacting p-isopropenylphenol with phenol and removing the catalyst, a second phenol removing step, a distillation step for separating bisphenol A and low boiling and high boiling substances and a cleaving step, the mother liquor from the principal process being fed to the sub-process and the distilled bisphenol A from the sub-process being fed to the principal process, is also herein provided.

REFERENCES:
patent: 4180683 (1979-12-01), Mitchell
patent: 4209646 (1980-06-01), Gac et al.
patent: 4354046 (1982-10-01), Ladewig et al.
patent: 4400553 (1983-08-01), Aneja
patent: 4400555 (1983-08-01), Mendiratta

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