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US 5,856,589 AGranted
Method to defoul bisphenol-phenol adduct fouled crystallizer coolers
AssigneeGeneral Electric Company
InventorMichael J. Cipullo
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Abstract
An improvement in the continuous preparation of a bisphenol comprising maintaining the efficiency of the adduct crystallizer. The improvement comprises maintaining the Delta-T of the crystallizer at less than about 4.degree. C.
Claims8
An improved method of defouling a cooling and crystallization surface, which comprises:
- crystallizing a 1:1 adduct of phenol and bisphenol-A in crystallizer until unacceptable fouling occurs;
- and
- dissolving the adduct adhering on the cooling and crystallization surface with phenol containing from 5 to 40 weight percent of water.
A method of continuously preparing a bisphenol, which comprises:
- condensing a ketone with a phenol in the presence of a molar excess of the phenol whereby a reaction product is obtained containing a 1:1 adduct of a bisphenol and the phenol;
- and
- separating the adduct from the reaction product by crystallization;
- and
- maintaining Delta-T of the crystallizer at less than about 4.degree. C. by dissolving the adduct adhering to the crystallizer cooling surfaces in a phenol water solution containing 5 to 40 percent v/v water.
2 more elements
Dependencies are inferred from the claim text.