PROCESS FOR CONTINUOUS PURIFICATION OF BISPHENOLS

The invention relates to a process for the continuous purification of crude bisphenol which comprises (1) forming a single liquid phase comprising a hot mixture of crude bisphenol and water in a ratio substantially of from 75% to 85% weight of crude bisphenol to 15% to 25% weight water; (2) continou...

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Bibliographic Details
Main Authors VAN SHAW, PAUL, BUECHELE, JAMES L, DONG, WALTER
Format Patent
LanguageEnglish
Published 16.06.1990
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Summary:The invention relates to a process for the continuous purification of crude bisphenol which comprises (1) forming a single liquid phase comprising a hot mixture of crude bisphenol and water in a ratio substantially of from 75% to 85% weight of crude bisphenol to 15% to 25% weight water; (2) continously feeding this mixture together with a stream of warm water to a first crystallization zone at a temperature sufficient to maintain a bisphenol-rich liquid phase, a water-rich phase and a crystalline phase comprising 70% to 95% of the total bisphenol in the mixture; (3) passing the three-phase mixture of bisphenol and water to a second crystallization zone operated at 85 DEG C to 97 DEG C until 90% to 99% of the total bisphenol is crystallized; and (4) recovering the purified bisphenol crystals.
Bibliography:Application Number: CA19892005470