Process for the purification of bisphenol

Details Process for the purification of bisphenol Process for the purification of bisphenol

1996-08-02

1998-07-28

Manoharan, Virginia

Distillation: processes, separatory

Plural distillations performed on same material

203 14, 203 73, 203 80, 568724, B01D 300, C07C 3774

Patent

active

057858233

ABSTRACT:
A process for preparing bisphenol A which has a purity of at least 99.95 wt. % of p,p-bisphenol A (BPA). Thermally stable and colour-stable BPA purified in accordance with the invention produces improved thermal and colour stability and improved optical transparency in polymers such as e.g. polycarbonates prepared therefrom.

REFERENCES:
patent: 4158611 (1979-06-01), Cooke
patent: 4387251 (1983-06-01), Meyer et al.
patent: 4400553 (1983-08-01), Aneja
patent: 4400555 (1983-08-01), Mendiratta
patent: 5269887 (1993-12-01), Jakob et al.

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