Method for producing high-purity bisphenols
AssigneeRohm and Haas Company
InventorsEric G. Lundquist, Michael P. Bigwood
Life of this patent
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Abstract
Low-color bisphenols may be produced by condensing phenol with ketones in the presence of a strong-acid cation exchange resin acting as an acid catalyst for the condensation reaction, and of a small amount, relative to the acid catalyst, of a weak-base anion exchange resin.
Claims21
A method for producing bisphenols having low color which comprises reacting phenol with an aliphatic aldehyde or ketone at an elevated temperature, in the presence of a catalytic amount of strong-acid cation exchange resin in the hydrogen form, and from about 0.5% to about 15% by weight, based on the weight of the cation exchange resin which is a crosslinked, synthetic polymer of a monoethylenically unsaturated monomer, functionalized with a primary or secondary amine functional group, of a weak-base anion exchange resin.
A method for producing bisphenol-A having low color which comprises contacting, at a temperature of from about 30.degree. C. to about 90.degree. C., a liquid stream containing phenol and acetone with a mixed bed of strong-acid cation exchange resin and front about 1% to about 10% by weight, based on the weight of the cation exchange resin, of a weak-base anion exchange resin which is a crosslinked, synthetic polymer of a monoethylenically unsaturated monomer, functionalized with a primary or secondary amine functional group for a sufficient time for a condensation reaction between the phenol and the acetone to occur, subsequently separating the liquid stream front the mixed bed of resins, and recovering bisphenol-A from the separated liquid stream.
Dependencies are inferred from the claim text.