US4079072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methanation process
Assignee: Phillips Petroleum Co
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Filing: 1976-11-15
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Granted: 1978-03-14
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Expires: 1996-11-15
Abstract
Abstract Methane is prepared by contacting carbon monoxide and hydrogen in the presence of a supported rhodium-containing catalyst promoted with uranium. In another embodiment, the methanation activity of supported rhodium-containing catalysts lost due to sulfur poisoning is restored by contacting the catalysts with a sulfur-free feed of carbon monoxide and hydrogen at a temperature of about 550° C for a period of time sufficient to substantially restore methanation catalyst activity.
Inventors
- 👤 Jack N. Finch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:44
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/02; C07C1/04; C07C1/0425; C07C1/043; C07C1/0435; B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/46; B01J23/464; C07C1/045; B01J23/54; B01J23/56; B01J23/63; C07C2521/00; C07C2521/02; C07C2521/04; C07C2521/06; C07C2521/12; C07C2523/00; C07C2523/12; C07C2523/38; C07C2523/40; C07C2523/46; C07C2523/54; C07C2523/56; C07C2523/63
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
153 words
In a process comprising contacting a feedstream comprising carbon monoxide and hydrogen with a supported rhodium-containing catalyst, which has been heated in a hydrogen stream, under methanation reaction conditions such that said carbon monoxide and hydrogen in said feedstream are converted to methane, and in which there is a loss of methanation catalyst activity caused by entry of sulfur into the feed and poisoning of said catalyst, the improvement for restoring methanation activity in situ of the sulfur-poisoned catalyst which comprises contacting said sulfur-poisoned catalyst under methanation conditions with a sulfur-free feed of carbon monoxide and hydrogen at a temperature of about 550° C for a period of time sufficient to substantially restore the activity of said catalyst, and continuing methanation by contacting said catalyst having restored methanation catalytic activity with carbon monoxide and hydrogen under methanation conditions such that a predominant amount of said carbon monoxide and hydrogen is converted to methane.
Claim 2
Dependent Claim
153 words
In a process comprising contacting a feedstream comprising carbon monoxide and hydrogen with a supported rhodium-containing catalyst, which has been heated in a hydrogen stream, under methanation reaction conditions such that said carbon monoxide and hydrogen in said feedstream are converted to methane, and in which there is a loss of methanation catalyst activity caused by entry of sulfur into the feed and poisoning of said catalyst, the improvement for restoring methanation activity in situ of the sulfur-poisoned catalyst which comprises contacting said sulfur-poisoned catalyst under methanation conditions with a sulfur-free feed of carbon monoxide and hydrogen at a temperature of about 550° C for a period of time sufficient to substantially restore the activity of said catalyst, and continuing methanation by contacting said catalyst having restored methanation catalytic activity with carbon monoxide and hydrogen under methanation conditions such that a predominant amount of said carbon monoxide and hydrogen is converted to methane.
Claim 3
Dependent Claim
35 words
A process according to claim 1 in which said rhodium-containing catalyst is promoted with from about 0.1 to about 10 weight percent uranium based on the weight of the metal plus rhodium plus the support.
Claim 4
Dependent Claim
54 words
A process according to claim 1 wherein said methanation reaction conditions include a temperature of about 200° C to about 600° C, a pressure in the range of about 0 to about 12,000 psig, a GHSV of about 200 to about 10,000, and a molar ratio of hydrogen to carbon monoxide of about 3.
Claim 5
Dependent Claim
23 words
A process according to claim 1 in which said support is a refractory particulate substrate selected from alumina, silica-alumina, and Group II titanates.
Claim 6
Dependent Claim
70 words
A process according to claim 1 wherein the amount of rhodium present in said catalyst ranges from about 0.05 to about 5 weight percent based on the weight of the metal plus support and the amount of uranium present and said catalyst is promoted with uranium in an amount ranging from about 0.1 to about 10 weight percent based on the weight of metal plus the rhodium plus the support.
Claim 7
Dependent Claim
84 words
A process comprising contacting a feedstream comprising carbon monoxide and hydrogen with an effective amount of a supported rhodium catalyst, which has been heated in a hydrogen stream and contains 0.05 to about 5 weight percent rhodium based on metal plus support and promoted with about 0.1 to about 10 weight percent uranium based on total weight of metals plus the support under methanation reaction conditions such that a predominant amount of said carbon monoxide and hydrogen in said feedstream is converted to methane.
Claim 8
Dependent Claim
84 words
A process comprising contacting a feedstream comprising carbon monoxide and hydrogen with an effective amount of a supported rhodium catalyst, which has been heated in a hydrogen stream and contains 0.05 to about 5 weight percent rhodium based on metal plus support and promoted with about 0.1 to about 10 weight percent uranium based on total weight of metals plus the support under methanation reaction conditions such that a predominant amount of said carbon monoxide and hydrogen in said feedstream is converted to methane.
Claim 9
Dependent Claim
60 words
A process according to claim 6 wherein said feedstream is contacted with said catalyst at a temperature in the range from about 200° C to about 600° C, a pressure in the range of about 0 to about 12,000 psig, a GHSV of about 200 to about 10,000, and a molar ratio of hydrogen to carbon monoxide of about 3.
Claim 10
Dependent Claim
22 words
A process according to claim 7 wherein said support is a refractory particulate substrate selected from alumina, silica-alumina, and Group II titanates.
Claim 11
Dependent Claim
31 words
A process according to claim 6 wherein a sulfur compound is also present in said feed in an amount sufficient to poison said catalyst and adversely affect catalytic conversion of reactant.
Claim 12
Dependent Claim
54 words
A process according to claim 9 for restoring catalyst activity in situ caused by sulfur poisoning by contacting said sulfur-poisoned catalyst under methanation conditions with a sulfur-free feed of carbon monoxide and hydrogen at a temperature of about 550° C for a period of time sufficient to substantially restore the activity of said catalyst.
Claim 13
Dependent Claim
31 words
A process according to claim 6 wherein the amount of rhodium present is about 0.5 weight percent and the amount of uranium present in said catalyst is about 3 weight percent.
References Cited (Backward Citations)
US2553398A
Cited
US2616914A
Cited
US2583611A
Cited
US2608568A
Cited
US2573795A
Cited
US2711419A
Cited
GB807584A
Cited
US3488171A
Cited
US3615164A
Cited
US3787468A
Cited
US3842121A
Cited
US3999961A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |