Patent US548940A successfully refreshed from Google Patents.
Patent US617831A successfully refreshed from Google Patents.
Patent US4458432A successfully refreshed from Google Patents.
Patent US2441111A successfully refreshed from Google Patents.
Patent US4885409A successfully refreshed from Google Patents.
US4885409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the hydrogenation of bis-phenols
Assignee: Montedison SpA
•
Filing: 1988-05-04
•
Granted: 1989-12-05
•
Expires: 2008-05-04
Abstract
Abstract Process for the hydrogenation of bis-phenols by reacting bis-phenols with hydrogen in the presence of a catalytic system consisting of palladium supported on activated carbon.
Inventors
- 👤 Andrea Gardano
- 👤 Francesco Casagrande
- 👤 Marco Foa
- 👤 Guido Petrini
- 👤 Riccardo Barisone
- 👤 Lawrence Chapoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:21
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/17; C07C29/19; C07C29/20; C07C2601/00; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
126 words
A process for the hydrogenation of bisphenol having the formula ##STR3## wherein R and R 1 , equal to or different from each other, are hydrogen or C 1 -C 10 alkyl radicals, and n is 0 or 1, to a product having the formula: ##STR4## wherein R, R 1 and n have the above meanings, with a content of trans-trans isomer in the product higher than 55% by weight and a reaction selectivity higher than 99% by weight, said process comprising reacting the compound (I), in bulk or in a solvent, with hydrogen in the presence of a catalytic system consisting essentially of palladium supported on an activated carbon, at a reaction temperature between activated carbon, at a reaction temperature between 80° and 160° C.
Claim 2
Dependent Claim
126 words
A process for the hydrogenation of bisphenol having the formula ##STR3## wherein R and R 1 , equal to or different from each other, are hydrogen or C 1 -C 10 alkyl radicals, and n is 0 or 1, to a product having the formula: ##STR4## wherein R, R 1 and n have the above meanings, with a content of trans-trans isomer in the product higher than 55% by weight and a reaction selectivity higher than 99% by weight, said process comprising reacting the compound (I), in bulk or in a solvent, with hydrogen in the presence of a catalytic system consisting essentially of palladium supported on an activated carbon, at a reaction temperature between activated carbon, at a reaction temperature between 80° and 160° C.
Claim 3
Dependent Claim
20 words
A process according to claim 1, wherein the activated carbon has a specific surface lower than 1000 m 2 /g.
Claim 4
Dependent Claim
21 words
A process according to claim 2, wherein the activated carbon has an specific surface between 400 and 900 m 2 /g.
Claim 5
Dependent Claim
21 words
A process according to claim 2, wherein the activated carbon has an specific surface between 600 and 800 m 2 /g.
Claim 6
Dependent Claim
22 words
A process according to claims 1, 2, 3 or 4, wherein the catalytic system has a pH higher than 7 in water.
Claim 7
Dependent Claim
31 words
A process according to claims 1, 2, 3 or 4, wherein the content of palladium in the catalytic system is between 1 and 20% by weight calculated on the dry catalyst.
Claim 8
Dependent Claim
18 words
A process according to claims 1, 2, 3 or 4, wherein the bisphenol is 2,2-bis(4-hydroxyphenyl) propane or 4,4'-dihydroxydiphenyl.
Claim 9
Dependent Claim
34 words
A process according to claim 1, wherein the solvent is selected from the class consisting of ethyl acetate, methyl-tert.butyl-ether and ethanol, either alone or additioned with water up to 2% by volume and cyclohexane.
Claim 10
Dependent Claim
30 words
A process according to claims 1, 2, 3 or 4 wherein the reaction of the bisphenol with hydrogen is carried out at a hydrogen pressure between 50 and 150 atmospheres.
Claim 11
Dependent Claim
30 words
A process according to claims 1, 2, 3 or 4 wherein the reaction of the bisphenol with hydrogen is carried out at a hydrogen pressure between 80 and 120 atmospheres.
References Cited (Backward Citations)
US1771089A
Cited
CA478018A
Cited
CA478463A
Cited
US4508918A
Cited
US3959382A
Cited
US4212990A
Cited
DE3401343A1
Cited
US4551564A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-04 | 1993-06-05 | 1993-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-04 | 1997-06-05 | 1997-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-04 | 2001-06-05 | 2001-12-05 | $7700.00 | Window Closed / Lapsed |