US4075254A
Expired / Lapsed
US
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Hydrogenation of alkylstyrene to produce alkylbenzene using copper chromite catalysts
Assignee: Braskem America Inc
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Filing: 1977-04-29
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Granted: 1978-02-21
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Expires: 1997-04-29
Abstract
Abstract A process for selective non-destructive catalytic hydrogenation of alkylstyrene such as alpha -methylstyrene in a mixed alpha -methylstyrene and cumene feed stream wherein the hydrogenation is conducted in the presence of a copper chromite catalyst. Preferably the hydrogenation is carried out at a pressure of between about 5 psia and about 300 psia. Use of this catalyst allows hydrogen streams containing up to about 30 per cent by volume carbon monoxide to be utilized.
Inventors
- 👤 Norman S. Boodman
- 👤 Jack W. Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:30
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/868; C; C07; C07C; C07C5/00; C07C5/02; C07C5/03; C07C2523/00; C07C2523/70; C07C2523/72; C07C2523/76; C07C2523/84; C07C2523/85; C07C2523/86
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
28 words
In the process for producing alkylbenzene by hydrogenating a feed stream comprising α-alkylstyrene, the improvement comprising carrying out the hydrogenation in the presence of a copper chromite catalyst.
Claim 2
Dependent Claim
28 words
In the process for producing alkylbenzene by hydrogenating a feed stream comprising α-alkylstyrene, the improvement comprising carrying out the hydrogenation in the presence of a copper chromite catalyst.
Claim 3
Dependent Claim
20 words
Process as in claim 1 wherein said feed stream comprises α-methylstyrene or benzene ring alkyl substituted α-methylstyrene or mixtures thereof.
Claim 4
Dependent Claim
12 words
Process as in claim 2 wherein the feed stream also contains cumene.
Claim 5
Dependent Claim
36 words
Process as in claim 2 wherein the hydrogenation is carried out at a temperature of between about 100° C and about 250° C and at a pressure of between about 5 psia and about 300 psia.
Claim 6
Dependent Claim
27 words
Process as in claim 4 wherein the hydrogenation is carried out using a hydrogen stream containing carbon monoxide in amounts of up to about 30% by volume.
Claim 7
Dependent Claim
37 words
Process as in claim 5 wherein the hydrogen is present in an amount such that the hydrogen to α-methylstyrene or benzene ring alkyl substituted α-methylstyrene or mixtures thereof molar ratio is between about 1.3 and about 5.0.
Claim 8
Dependent Claim
62 words
In a process for producing alkylbenzene by hydrogenating a reaction mixture resulting from the production of phenol by oxidation of cumene and decomposition and dehydration of the reaction product, which reaction mixture comprises (1) cumene and (2) α-methylstyrene or benzene ring alkyl substituted α-methylstyrene or mixtures thereof, the improvement comprising carrying the hydrogenation out in the presence of a copper chromite catalyst.
Claim 9
Dependent Claim
62 words
In a process for producing alkylbenzene by hydrogenating a reaction mixture resulting from the production of phenol by oxidation of cumene and decomposition and dehydration of the reaction product, which reaction mixture comprises (1) cumene and (2) α-methylstyrene or benzene ring alkyl substituted α-methylstyrene or mixtures thereof, the improvement comprising carrying the hydrogenation out in the presence of a copper chromite catalyst.
Claim 10
Dependent Claim
30 words
Process as in claim 7 wherein the α-methylstyrene or benzene ring alkyl substituted α-methylstyrene or mixtures thereof is present in an amount between about 10 and about 80% by weight.
Claim 11
Dependent Claim
36 words
Process as in claim 8 wherein the hydrogenation is carried out at a temperature of between about 100° C and about 250° C and at a pressure of between about 5 psia and about 300 psia.
Claim 12
Dependent Claim
27 words
Process as in claim 9 wherein the hydrogenation is carried out using a hydrogen stream containing carbon monoxide in amounts of up to about 30% by volume.
Claim 13
Dependent Claim
36 words
Process as in claim 10 wherein the hydrogen is present in an amount such that the hydrogen to α-methylstyrene or benzene ring alkyl substituted α-methylstyrene or mixtures thereof molar ratio is between about 1.3 and 5.0.
Claim 14
Dependent Claim
84 words
In the process for producing alkylbenzene by hydrogenating a crude feed stream comprising cumene and α-methylstyrene, the improvement comprising carring out the hydrogenation in the presence of the copper chromite catalyst and wherein the α-methylstyrene is present in an amount between about 10 and about 80% by weight and wherein the hydrogenation is carried out at a pressure of between about 5 psia and about 300 psia and wherein the hydrogen stream contains carbon monoxide in amounts of up to about 30% by volume.
Claim 15
Dependent Claim
84 words
In the process for producing alkylbenzene by hydrogenating a crude feed stream comprising cumene and α-methylstyrene, the improvement comprising carring out the hydrogenation in the presence of the copper chromite catalyst and wherein the α-methylstyrene is present in an amount between about 10 and about 80% by weight and wherein the hydrogenation is carried out at a pressure of between about 5 psia and about 300 psia and wherein the hydrogen stream contains carbon monoxide in amounts of up to about 30% by volume.
Claim 16
Dependent Claim
27 words
Process as in claim 12 wherein the hydrogen is present in an amount such that the hydrogen to α-methylstyrene molar ratio is between about 1.3 and 5.0.
Claim 17
Dependent Claim
25 words
Process as in claim 13 wherein the temperature is maintained sufficiently high to maintain the feed stream as a gas or vapor or mixtures thereof.
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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) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |