Patent US3673262A successfully refreshed from Google Patents.
US3673262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystallization of diphenylol alkanes
Assignee: Hooker Chemical Corp
•
Filing: 1968-12-20
•
Granted: 1972-06-27
•
Expires: 1988-12-20
Abstract
Abstract An unexpected marked increase in the solubility of a gemdiphenylol alkane at a temperature above near the atmospheric boiling point of a solvent selected from the group consisting of benzene, toluene, methylene chloride, ethylene dichloride, and trichloroethylene, enables a process for purifying the gemdiphenylol alkane by dissolving it in the solvent at a temperature above the atmospheric boiling point and at a pressure above the vapor pressure of the resultant material, cooling the resultant material, and recovering the resulting crystals of gemdiphenylol alkane therefrom.
Inventors
- 👤 Walter H Prahl
- 👤 Sol J Lederman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:36
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/70; C07C37/84
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
13 words
cooling said resultant material, and recovering the resultant crystals of gem-diphenylol alkane therefrom.
Claim 2
Dependent Claim
18 words
The process according to claim 1 wherein the gem-diphenylol alkane is 2,2-bis(4-hydroxyphenyl) propane and the solvent is benzene.
Claim 3
Dependent Claim
13 words
cooling said resultant material, and recovering the resultant crystals of gem-diphenylol alkane therefrom.
Claim 4
Dependent Claim
18 words
The process according to claim 1 wherein the gem-diphenylol alkane is 2,2-bis(4-hydroxyphenyl) propane and the solvent is toluene.
Claim 5
Dependent Claim
19 words
The process according to claim 1 wherein the gem-diphenylol alkane is 2,2-bis(4-hydroxyphenyl) propane and the solvent is methylene chloride.
Claim 6
Dependent Claim
19 words
The process according to claim 1 wherein the gem-diphenylol alkane is 2,2-bis(4-hydroxyphenyl) propane and the solvent is ethylene dichloride.
Claim 7
Dependent Claim
18 words
The process according to claim 1 wherein the gem-diphenylol alkane is 2,2-bis(4-hydroxyphenyl) propane and the solvent is trichloroethylene.
Claim 8
Dependent Claim
13 words
The process according to claim 1 wherein the gem-diphenylol alkane is 2,2-bis(4-hydroxyphenyl) butane.
Claim 9
Dependent Claim
18 words
The process according to claim 1 wherein the gem-diphenylol alkane is 2,2-bis(4-hydroxyphenyl) butane and the solvent is benzene.
Claim 10
Dependent Claim
18 words
The process according to claim 1 wherein the gem-diphenylol alkane is 1,1-bis(4-hydroxyphenyl) cyclohexane and the solvent is benzene.
Claim 11
Dependent Claim
18 words
The process according to claim 1 wherein the gem-diphenylol alkane is 1,1-bis(4-hydroxyphenyl) cyclohexane and the solvent is benzene.
Claim 12
Dependent Claim
20 words
The process according to claim 1 wherein the cooling is effected by reducing the pressure on the said resultant material.
Claim 13
Dependent Claim
40 words
The process according to claim 1 wherein the cooling is effected by injecting the said resultant material into a slurry of said gem-diphenylol alkane in said solvent maintained at a pressure lower than the pressure of the material being injected.
Claim 14
Dependent Claim
31 words
The process according to claim 1 wherein the gem-diphenylol alkane has been previously subjected to a purification wherein the gem-diphenylol alkane has been distilled to remove materials more volatile than it.
Claim 15
Dependent Claim
34 words
The process according to claim 1 wherein the unsubstituted gem-diphenylol alkane has been previously subjected to a purification wherein the gem-diphenylol alkane has been distilled to remove materials more and less volatile than it.
Claim 16
Dependent Claim
43 words
The process for purifying a gem-diphenylol alkane selected from the group consisting of 2,2-bis(4-hydroxyphenyl) propane, 2, 2-bis(4-hydroxyphenyl) butane, and 1,1-bis(4-hydroxyphenyl) cyclohexane containing essentially only impurities, produced by condensing phenol and an organic carbonyl compound and boiling close to the gem-diphenylol alkane, which comprises:
Claim 17
Dependent Claim
18 words
The process according to claim 15 wherein the gem-diphenylol alkane is 2,2-bis(4-hydroxyphenyl) propane and the solvent is benzene.
Claim 18
Dependent Claim
18 words
The process according to claim 15 wherein the gem-diphenylol alkane is 2,2-bis(4-hydroxyphenyl) propane and the solvent is toluene.
Claim 19
Dependent Claim
19 words
The process according to claim 15 wherein the gem-diphenylol alkane is 2,2-bis(4-hydroxyphenyl) propane and the solvent is methylene chloride.
Claim 20
Dependent Claim
19 words
The process according to claim 15 wherein the gem-diphenylol alkane is 2,2-bis(4-hydroxyphenyl) propane and the solvent is ethylene dichloride.
Claim 21
Dependent Claim
18 words
The process according to claim 15 wherein the gem-diphenylol alkane is 2,2-bis(4-hydroxyphenyl) propane and the solvent is trichloroethylene.
Claim 22
Dependent Claim
13 words
The process according to claim 15 wherein the gem-diphenylol alkane is 2,2-bis(4-hydroxyphenyl) butane.
Claim 23
Dependent Claim
18 words
The process according to claim 15 wherein the gem-diphenylol alkane is 2,2-bis(4-hydroxyphenyl) butane and the solvent is benzene.
Claim 24
Dependent Claim
13 words
The process according to claim 15 wherein the gem-diphenylol alkane is 1,1-bis(4-hydroxyphenyl) cyclohexane.
Claim 25
Dependent Claim
18 words
The process according to claim 15 wherein the gem-diphenylol alkane is 1,1-bis(4-hydroxyphenyl) cyclohexane and the solvent is benzene.
Claim 26
Dependent Claim
20 words
The process according to claim 15 wherein the cooling is effected by reducing the pressure on the said resultant material.
Claim 27
Dependent Claim
40 words
The process according to claim 15 wherein the cooling is effected by injecting the said resultant material into a slurry of said gem-diphenylol alkane in said solvent maintained at a pressure lower than the pressure of the material being injected.
Claim 28
Dependent Claim
31 words
The process according to claim 15 wherein the gem-diphenylol alkane has been previously subjected to a purification wherein the gem-diphenylol alkane has been distilled to remove materials more volatile than it.
Claim 29
Dependent Claim
33 words
The process according to claim 15 wherein the gem-diphenylol alkane has been previously subjected to a purification wherein the gem-diphenylol alkane has been distilled to remove materials more and less volatile than it.
References Cited (Backward Citations)
US2959622A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |