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Process for the hydrogenation of bis-phenols
Assignee: Montedison SpA
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Filing: 1988-05-04
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Granted: 1989-12-05
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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
2026-11-04 22:52
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.
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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) | 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 |