US4192955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of 2,2-bis(4-hydroxyphenyl) propane
Assignee: General Electric Co
•
Filing: 1977-12-28
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Granted: 1980-03-11
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Expires: 1997-12-28
Abstract
Abstract 2,2-Bis(4-hydroxyphenyl) propane, herein referred to as bisphenol-A, is recovered from crude or partially purified adducts with phenol by dissolving in a solvent in which the bisphenol-A phenol adduct is soluble and which is miscible with water, mixing the resulting adduct-solvent solution with water at a temperature at which the adduct is soluble therein, cooling the mixture to a temperature where substantially all of the bisphenol-A precipitates substantially without co-precipitation of the phenol, and physically recovering said precipitated bisphenol-A. Also contemplated is an embodiment wherein such a solvent solution of bisphenol-A or the adduct thereof with phenol is added to the water, rather than vice-versa, and high purity, easy to handle rhombic crystals of bis-phenol-A are produced.
Inventors
- 👤 Clayton W. Reinitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:06
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/70; C07C37/84
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
81 words
A process to recover 2,2-bis(4-hydroxyphenyl) propane from an equimolar adduct of 2,2-bis(4-hydroxyphenyl) propane and phenol, the process comprising dissolving the adduct in a solvent in which the adduct is soluble and which is miscible with water, mixing the resulting adduct-solvent solution with water at a temperature at which the adduct is soluble therein, cooling the resulting mixture to a temperature where substantially all of the 2,2-bis(4-hydroxyphenyl) propane precipitates substantially without co-precipitation of the phenol and physically recovering said precipitated 2,2-bis(4-hydroxyphenyl) propane.
Claim 2
Dependent Claim
81 words
A process to recover 2,2-bis(4-hydroxyphenyl) propane from an equimolar adduct of 2,2-bis(4-hydroxyphenyl) propane and phenol, the process comprising dissolving the adduct in a solvent in which the adduct is soluble and which is miscible with water, mixing the resulting adduct-solvent solution with water at a temperature at which the adduct is soluble therein, cooling the resulting mixture to a temperature where substantially all of the 2,2-bis(4-hydroxyphenyl) propane precipitates substantially without co-precipitation of the phenol and physically recovering said precipitated 2,2-bis(4-hydroxyphenyl) propane.
Claim 3
Dependent Claim
30 words
A process as defined in claim 1 wherein the solvent is a lower alkyl alcohol, a lower alkyl ketone, a lower alkyl nitrile, a lower alkanoic acid, tetrahydrofuran or dioxane.
Claim 4
Dependent Claim
15 words
A process as defined in claim 2 wherein the solvent is a lower alkyl alcohol.
Claim 5
Dependent Claim
14 words
A process as defined in claim 3 wherein the alcohol is methanol or ethanol.
Claim 6
Dependent Claim
12 words
A process as defined in claim 2 wherein the solvent is acetonitrile.
Claim 7
Dependent Claim
12 words
A process as defined in claim 2 wherein the solvent is tetrahydrofuran.
Claim 8
Dependent Claim
12 words
A process as defined in claim 2 wherein the solvent is acetone.
Claim 9
Dependent Claim
20 words
A process as defined in claim 1 wherein the concentration of adduct to solvent is from about 5% to saturation.
Claim 10
Dependent Claim
31 words
A process as defined in claim 1 wherein the quantity of water with which the adduct-solvent solution is mixed is from 1 to about 10 times the weight of the adduct.
Claim 11
Dependent Claim
29 words
A process as defined in claim 1 wherein the temperature of the water with which the adduct-solvent solution is mixed is from about 45° C. to about 100° C.
Claim 12
Dependent Claim
35 words
A process as defined in claim 1 wherein the temperature to which the mixture of adduct, solvent and water is cooled for precipitation of 2,2-bis(4-hydroxyphenyl) propane is from about 25° C. to about 50° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-11 | 1983-09-10 | 1984-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-11 | 1987-09-10 | 1988-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-11 | 1991-09-10 | 1992-03-11 | $7700.00 | Window Closed / Lapsed |