US3760018A
Expired / Lapsed
US
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Hydroalkylation catalyst and process
Assignee: Texaco Inc
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Filing: 1971-05-17
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Granted: 1973-09-18
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Expires: 1991-05-17
Abstract
Abstract A method for the catalytic hydroalkylation of an aromatic hydrocarbon. An aromatic hydrocarbon, for example, benzene is contacted with hydrogen and a dual function catalyst at hydroalkylation conditions including a temperature within the range of about 200* to 450* F. and at a hydrogen pressure of at least one atmosphere. The dual function catalyst comprises rhenium and an acidic oxide support. The acidic oxide support may be a silica-alumina cracking catalyst or a substantially alkali metal-free mixture of about 5 to 60 percent by weight of a crystalline zeolite and about 95 to 40 percent by weight of an alumina or a silica-alumina cracking catalyst. The hydrogenation activity of the rhenium may be modified by the inclusion of a Group VIII metal, a Group VI metal or their mixtures. Before use the composite catalyst is calcined at a temperature within the range of about 800* to 1500*F. and is reduced with hydrogen at a temperature within the range of about 400* to 1200*F. The process is useful in the hydroalkylation of benzene to prepare cyclohexylbenzene.
Inventors
- 👤 J Crone
- 👤 R Suggitt
- 👤 A Arkell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:46
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/889; B01J23/8896; B01J23/16; B01J23/32; B01J23/36; B01J23/38; B01J23/54; B01J23/56; B01J23/64; B01J23/656; B01J23/6567; B01J29/00; B01J29/04; B01J29/06; B01J29/08; B01J29/16; C; C07; C07C; C07C2/00; C07C2/74; C07C2521/00; C07C2521/12; C07C2523/00; C07C2523/16; C07C2523/32; C07C2523/36; C07C2529/00; C07C2529/04; C07C2529/06; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
15 words
The method of claim 1 wherein said acidic oxide support comprises a silica-alumina cracking catalyst.
Claim 2
Dependent Claim
43 words
The method of claim 1 wherein said acidic oxide support consists essentially of a substantially alkali metal-free mixture of about 5 to 60 percent by weight of a crystalline zeolite and about 95 to 40 percent by weight of a silica-alumina cracking catalyst.
Claim 3
Dependent Claim
40 words
The method of claim 1 wherein said acidic oxide support consists essentially of a substantially alkali metal-free mixture of about 5 to 60 percent by weight of a crystalline zeolite and about 95 to 40 percent by weight of alumina.
Claim 4
Dependent Claim
31 words
The method of claim 1 wherein said hydroalkylation conditions include a reaction temperature within the range of about 200* to 450*F. and a hydrogen partial pressure of at least one atmosphere.
Claim 5
Dependent Claim
39 words
The method of claim 1 wherein said hydroalkylation conditions include a reaction temperature within the range of about 300* to 400*F. and a hydrogen partial pressure within the range of about 100 to 500 pounds per square inch gauge.
Claim 6
Dependent Claim
19 words
The method of claim 1 wherein said catalyst consists essentially of tungsten, rhenium metal and said acidic oxide support.
Claim 7
Dependent Claim
24 words
The method of claim 1 wherein said crystalline zeolite is prepared by an alternative sequence of at least two ion exchanges and two calcinations.
Claim 8
Dependent Claim
21 words
The method of claim 1 wherein said catalyst is calcined at a temperature within the range of about 800* to 1500*F.
Claim 9
Dependent Claim
21 words
The method of claim 1 wherein said catalyst is calcined at a temperature within the range of about 1000* to 1200*F.
Claim 10
Dependent Claim
21 words
The method of claim 1 wherein said catalyst is reduced at a temperature within the range of about 400* to 1200*F.
Claim 11
Dependent Claim
21 words
The method of claim 1 wherein said catalyst is reduced at a temperature within the range of about 500* to 1000*F.
Claim 12
Dependent Claim
12 words
The method of claim 1 wherein said aromatic hydrocarbon charge is benzene.
Claim 13
Independent Claim
81 words
A method for the catalytic hydroalkylation of an aromatic hydrocarbon charge selected from the group consisting of benzene, alkylbenzenes and their mixtures which comprises contacting said aromatic hydrocarbon charge and hydrogen at hydroalkylation conditions, including reaction temperature of 200*F.-450*F. and hydrogen partial pressure greater than one atmosphere and less than about 500 psig, with a calcined and reduced catalyst comprising within the range of about 0.1 to 10.0 weight percent rhenium and, as an acidic oxide support, a silica-alumina cracking catalyst.
Claim 14
Independent Claim
80 words
A method for thE catalytic hydroalkylation of benzene which comprises contacting said benzene charge and hydrogen at hydroalkylation conditions, including reaction temperature of 200*F.-450*F. and hydrogen partial pressure greater than one atmosphere and less than about 500 psig, with a calcined and reduced catalyst comprising within the range of about 0.1 to 10.0 weight percent rhenium and, as an acidic oxide support, a silica-alumina cracking catalyst, thereby forming a product stream containing cyclohexylbenzene; and recovering said product stream containing cyclohexylbenzene.
Claim 15
Dependent Claim
98 words
A method as claimed in claim 15 for the catalytic hydroalkylation of benzene which comprises contacting said benzene charge and hydrogen at hydroalkylation conditions, including reaction temperature of 200*F.-450*F. and hydrogen partial pressure greater than one atmosphere and less than about 500 psig, with a calcined and reduced catalyst comprising within the range of about 0.1 to 10.0 weight percent rhenium and, as an acidic oxide support, a composition consisting essentially of a substantially alkali metal-free mixture of about 5-60 percent by weight of a crystalline zeolite and about 40-95 percent by weight of a silica-alumina cracking catalyst.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |