Patent US4242527A successfully refreshed from Google Patents.
US4242527A
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Process for purifying crude diphenols
Assignee: General Electric Co
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Filing: 1979-05-23
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Granted: 1980-12-30
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Expires: 1999-05-23
Abstract
Abstract A process for purifying crude diphenols via a water co-solvent system is disclosed.
Inventors
- 👤 Victor Mark
- 👤 Charles V. Hedges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:06
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/70; C07C37/72
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
94 words
A process for purifying crude diphenols to recover the p,p'-diphenol isomer which comprises (a) dispersing the crude diphenol in a system of water and a monohydroxylic alcoholic or phenolic co-solvent or mixtures of co-solvents so that the p,p'-diphenol and the more soluble impurities are dissolved in the system at a temperature that is at or near the boiling point of water or at or near the boiling point of the water/co-solvent system; (b) removing the less soluble impurities from the system; and (c) cooling the system to achieve the separation of the purified p,p'-diphenol.
Claim 2
Dependent Claim
94 words
A process for purifying crude diphenols to recover the p,p'-diphenol isomer which comprises (a) dispersing the crude diphenol in a system of water and a monohydroxylic alcoholic or phenolic co-solvent or mixtures of co-solvents so that the p,p'-diphenol and the more soluble impurities are dissolved in the system at a temperature that is at or near the boiling point of water or at or near the boiling point of the water/co-solvent system; (b) removing the less soluble impurities from the system; and (c) cooling the system to achieve the separation of the purified p,p'-diphenol.
Claim 3
Dependent Claim
23 words
A process according to claim 1 wherein the co-solvent is selected from the group consisting of methanol, ethanol, 1-propanol, 2-propanol, 2-methoxyethanol and ethanolamine.
Claim 4
Dependent Claim
12 words
A process according to claim 1 wherein crude diphenol is crude 2,2-bis(4-hydroxyphenyl)propane.
Claim 5
Dependent Claim
28 words
A process according to claim 1 wherein, in step (a), the water/co-solvent system is at a temperature of from about 90° C. to 100° C. at atmospheric pressure.
Claim 6
Dependent Claim
15 words
A process according to claim 1 wherein step (a) is carried out at super-atmospheric pressure.
Claim 7
Dependent Claim
98 words
A process for purifying crude diphenols to recover the p,p'-diphenol isomer which comprises (a) dispersing the crude diphenol in water; (b) heating the resulting slurry; (c) adding a monohydroxylic alcoholic or phenolic co-solvent to the slurry so that the p,p'-diphenol and the more soluble impurities are dissolved in the resulting water/co-solvent system at a temperature that is at or near the boiling point of water or at or near the boiling point of the water/co-solvent system; (d) removing the less soluble impurities from the system; and (e) cooling the system to achieve the separation of the purified p,p'-diphenol.
Claim 8
Dependent Claim
98 words
A process for purifying crude diphenols to recover the p,p'-diphenol isomer which comprises (a) dispersing the crude diphenol in water; (b) heating the resulting slurry; (c) adding a monohydroxylic alcoholic or phenolic co-solvent to the slurry so that the p,p'-diphenol and the more soluble impurities are dissolved in the resulting water/co-solvent system at a temperature that is at or near the boiling point of water or at or near the boiling point of the water/co-solvent system; (d) removing the less soluble impurities from the system; and (e) cooling the system to achieve the separation of the purified p,p'-diphenol.
Claim 9
Dependent Claim
23 words
A process according to claim 6 wherein the co-solvent is selected from the group consisting of methanol, ethanol, 1-propanol, 2-propanol, 2-methoxyethanol and ethanolamine.
Claim 10
Dependent Claim
12 words
A process according to claim 6 wherein crude diphenol is crude 2,2-bis(4-hydroxyphenyl)propane.
Claim 11
Dependent Claim
28 words
A process according to claim 6 wherein, in step (c), the water/co-solvent system is at a temperature of from about 90° C. to 100° C. at atmospheric pressure.
Claim 12
Dependent Claim
15 words
A process according to claim 7 wherein step (c) is carried out at super-atmospheric pressure.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |