Purification of bisphenol-A
First Claim
Patent Images
1. The method of recovering 2,2-bis(4-hydroxyphenyl)propane in a purified state from a mixture of the latter and impurities derived from the acid condensation of phenol and acetone which comprises:
- (1) combining a mixture of (a) an adduct of phenol and said 2,2-bis(4-hydroxyphenyl)propane and (b) impurities associated with (a), with from 1 to 4 parts, by weight, water per weight part of adduct,(2) heating the mixture of the adduct and water at a temperature from 85°
to 110°
C., to break said adduct and form a two-phase liquid aqueous-organic system,(3) separating the organic phase containing said 2,2-bis(4-hydroxyphenyl)propane from the aqueous phase formed in (2) while the two phases are at an elevated temperature,(4) adding the organic phase an amount of water less than that used in step (1), wherein the water and organic phase mixture is at a temperature of at least 85°
C., and(5) cooling the mixture to precipitate said 2,2-bis(4-hydroxyphenyl)propane in a highly purified state.
0 Assignments
0 Petitions
Accused Products
Abstract
Pure bisphenol-A can be obtained by treating the adduct of the latter and phenol with water in two stages.
17 Citations
3 Claims
-
1. The method of recovering 2,2-bis(4-hydroxyphenyl)propane in a purified state from a mixture of the latter and impurities derived from the acid condensation of phenol and acetone which comprises:
-
(1) combining a mixture of (a) an adduct of phenol and said 2,2-bis(4-hydroxyphenyl)propane and (b) impurities associated with (a), with from 1 to 4 parts, by weight, water per weight part of adduct, (2) heating the mixture of the adduct and water at a temperature from 85°
to 110°
C., to break said adduct and form a two-phase liquid aqueous-organic system,(3) separating the organic phase containing said 2,2-bis(4-hydroxyphenyl)propane from the aqueous phase formed in (2) while the two phases are at an elevated temperature, (4) adding the organic phase an amount of water less than that used in step (1), wherein the water and organic phase mixture is at a temperature of at least 85°
C., and(5) cooling the mixture to precipitate said 2,2-bis(4-hydroxyphenyl)propane in a highly purified state. - View Dependent Claims (2, 3)
-
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
-
Current AssigneeGeneral Electric Company
-
Original AssigneeGeneral Electric Company
-
InventorsLi, Ming K.
-
Primary Examiner(s)Evans, J. E.
-
Application NumberUS06/088,768Time in Patent Office1,436 DaysField of Search568/724US Class Current568/724CPC Class CodesC07C 37/685 Processes comprising at lea...C07C 37/72 by liquid-liquid treatmentC07C 39/16 Bis-(hydroxyphenyl) alkanes...
