Manufacture of bisphenol A
AssigneeSabic Global Technologies B.V.
InventorBranislav Obradovic
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Abstract
The invention is directed to a method for the manufacture of bisphenol A, and to bisphenol A/phenol adduct crystals. The method of the invention comprises: a) reacting phenol and acetone in the presence of an acidic catalyst to form a reaction product comprising an initial concentration of bisphenol A and an initial concentration of impurities; b) diluting the reaction product with phenol, water and/or acetone, so as to decrease the impurity concentration to 50% by weight or less of the initial concentration of impurities, and adding bisphenol A to increase the concentration thereof in the reaction product; and thereafter c) crystallising a bisphenol A/phenol adduct from the reaction product to produce a crystallised bisphenol A product.
Claims18
A method for the manufacture of bisphenol A comprising:
- a) reacting phenol and acetone in the presence of an acidic catalyst to form a reaction product comprising an initial concentration of bisphenol A and an initial concentration of impurities;
- b) diluting the reaction product with phenol, water and/or acetone, so as to decrease the impurity concentration to 50% or less of the initial concentration of impurities, and adding bisphenol A to increase the concentration thereof in the reaction product;
- and thereafter
- c) crystallising a bisphenol A/phenol adduct from the reaction product to produce a crystallised bisphenol A product;
- wherein the addition of bisphenol A in step b) is such that the concentration of bisphenol A is set to 70-200% of the initial concentration of bisphenol A;
- and said crystallisation is carried out in a single step.
Dependencies are inferred from the claim text.