Process for continuous purification of bisphenols
First Claim
1. 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 about 75% to about 85% weight of crude bisphenol to about 15% to about 25% weight water;
- (2) continuously feeding this mixture together with a stream of warm water to a first crystallization zone at a temperature of the combined streams sufficient to maintain a bisphenol-rich liquid phase, a water-rich phase and a crystalline phase comprising about 70% to about 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 about 85°
C. to about 97°
C. until about 90% to about 99% of the total bisphenol is crystallized; and
(4) recovering the purified bisphenol crystals.
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Accused Products
Abstract
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 about 75% to about 85% weight of crude bisphenol to about 15% to about 25% weight water; (2) continuously 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 about 70% to about 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 about 85° C. to about 97° C. until about 90% to about 99% of the total bisphenol is crystallized; and (4) recovering the purified bisphenol crystals.
15 Citations
5 Claims
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1. 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 about 75% to about 85% weight of crude bisphenol to about 15% to about 25% weight water;
- (2) continuously feeding this mixture together with a stream of warm water to a first crystallization zone at a temperature of the combined streams sufficient to maintain a bisphenol-rich liquid phase, a water-rich phase and a crystalline phase comprising about 70% to about 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 about 85°
C. to about 97°
C. until about 90% to about 99% of the total bisphenol is crystallized; and
(4) recovering the purified bisphenol crystals. - View Dependent Claims (2, 3, 4, 5)
- (2) continuously feeding this mixture together with a stream of warm water to a first crystallization zone at a temperature of the combined streams sufficient to maintain a bisphenol-rich liquid phase, a water-rich phase and a crystalline phase comprising about 70% to about 95% of the total bisphenol in the mixture;
Specification
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- Resources
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Current AssigneeResolution Performance Products LLC (Bakelite UK TopCo Ltd.)
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Original AssigneeShell Oil Company (Shell Plc)
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InventorsDong, Walter, Buechele, James L., Shaw, Paul V.
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Primary Examiner(s)Lone, Werren B.
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Application NumberUS07/285,254Time in Patent Office522 DaysField of Search568/724, 568/729, 568/722, 568/749US Class Current568/724CPC Class CodesC07C 37/84 by crystallisationC07C 39/16 Bis-(hydroxyphenyl) alkanes...
