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Process for the production of bisphenol A

  • US 5,399,784 A
  • Filed: 09/23/1993
  • Issued: 03/21/1995
  • Est. Priority Date: 08/05/1991
  • Status: Expired due to Term
First Claim
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1. A process for the production of bisphenol A, comprising the steps of:

  • (a) reacting acetone with a stoichiometrically excess amount of phenol to obtain a bisphenol A-containing product;

    (b) crystallizing said product to obtain a crystalline adduct of bisphenol A and phenol;

    (c) providing raw material phenol which contains an impurity convertible to a high boiling point material having a boiling point of higher than 185°

    C. upon being heated at a temperature higher than the melting point of phenol;

    (d) contacting said raw material phenol with a gel-type sulfonic acid-type cation exchange resin having a degree of cross-linking of 10% by weight or less at a temperature and for a period of time sufficient to convert at least part of said impurity into said high boiling point material and to obtain treated phenol;

    (e) distilling said treated phenol at a temperature of 185°

    C. or less to separate purified phenol, as distillate, from said high boiling point material;

    (f) washing said adduct with said purified phenol; and

    (g) decomposing said washed adduct to obtain bisphenol A.

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