US4021370A
Expired / Lapsed
US
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Fuel gas production
Assignee: Johnson Matthey Davy Technologies Ltd
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Filing: 1975-10-17
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Granted: 1977-05-03
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Expires: 1995-10-17
Abstract
Abstract A process is described for the production of methane from methanol by catalytic dehydration and dehydrogenation providing a high initial methane yield and a final substitute natural gas product of high calorific value. The catalytic dehydration and dehydrogenation steps may be effected simultaneously or in sequence. High efficiency in usage of raw materials and thermal requirements of the process are secured. A preferred catalyst containing both dehydration and dehydrogenation functions consists essentially of a major amount of iron oxide and minor amounts of chromium oxide and phosphate or tungstate ions.
Inventors
- 👤 Norman Harris
- 👤 Thomas Frederick Shevels
- 👤 Alan James Dennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:52
CPC Classifications
F; F02; F02B; F02B1/00; F02B1/02; B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/862; B01J27/00; B01J27/14; B01J27/16; B01J27/18; C; C01; C01B; C01B3/00; C01B3/02; C01B3/22; C01B3/32; C01B3/34; C01B3/38; C07; C07C; C07C2521/00; C07C2521/02; C07C2521/04; C07C2523/00; C07C2523/16; C07C2523/24; C07C2523/26; C07C2523/70; C07C2523/74; C07C2523/745; C07C2523/755; C07C2523/76; C07C2523/84; C07C2523/85; C07C2523/86; C07C2523/888; C07C2527/00; C07C2527/14; C07C2527/16; C07C2527/167; C07C2527/173; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
63 words
A catalyst consisting essentially of a major amount of iron oxide, a minor, catalytically-effective amount of chromium oxide sufficient to impart stability to the catalyst, and phosphate or tungstate ions chemically-combined therewith, said phosphate or tungstate ions being present in a minor amount sufficient to impart a dehydration function to the catalyst, said amounts being based on the total weight of said components.
Claim 2
Dependent Claim
63 words
A catalyst consisting essentially of a major amount of iron oxide, a minor, catalytically-effective amount of chromium oxide sufficient to impart stability to the catalyst, and phosphate or tungstate ions chemically-combined therewith, said phosphate or tungstate ions being present in a minor amount sufficient to impart a dehydration function to the catalyst, said amounts being based on the total weight of said components.
Claim 3
Dependent Claim
12 words
A catalyst of claim 1 wherein said chemically-combined ions are phosphate ions.
Claim 4
Dependent Claim
18 words
A catalyst of claim 2 wherein said amount of phosphate ions is up to about 9 weight %.
Claim 5
Dependent Claim
24 words
A catalyst of claim 2 wherein said amount of chromium is about 4 weight % to about 20 weight %, calculated as chromium oxide.
Claim 6
Dependent Claim
24 words
A catalyst of claim 2 wherein said amount of chromium is about 8 weight % to about 18 weight %, calculated as chromium oxide.
Claim 7
Dependent Claim
21 words
A catalyst of claim 5 wherein said amount of phosphate ions is about 0.5 weight % to about 10 weight %.
Claim 8
Dependent Claim
31 words
A catalyst composition of claim 1 having from about 8 to about 18 weight % chromium, calculated as chromium oxide, and from about 1 to about 9 weight % phosphate ions.
Claim 9
Dependent Claim
72 words
A catalyst consisting essentially of a major amount of iron oxide, a minor amount of chromium oxide sufficient to impart stability to the catalyst, and phosphate or tungstate ions chemically-combined therewith, said phosphate or tungstate ions being present in a minor amount sufficient to impart a dehydration function to the catalyst, said amounts being based on the total weight of said components, and said catalyst being essentially free from Group 8 metals.
Claim 10
Dependent Claim
72 words
A catalyst consisting essentially of a major amount of iron oxide, a minor amount of chromium oxide sufficient to impart stability to the catalyst, and phosphate or tungstate ions chemically-combined therewith, said phosphate or tungstate ions being present in a minor amount sufficient to impart a dehydration function to the catalyst, said amounts being based on the total weight of said components, and said catalyst being essentially free from Group 8 metals.
Claim 11
Dependent Claim
12 words
A catalyst of claim 8 wherein said chemically-combined ions comprise phosphate ions.
Claim 12
Dependent Claim
18 words
A catalyst of claim 9 wherein said amount of phosphate ions is up to about 9 weight %.
Claim 13
Dependent Claim
24 words
A catalyst of claim 9 wherein said amount of chromium is about 4 weight % to about 20 weight %, calculated as chromium oxide.
Claim 14
Dependent Claim
24 words
A catalyst of claim 11 wherein said amount of chromium is about 8 weight % to about 18 weight %, calculated as chromium oxide.
Claim 15
Dependent Claim
21 words
A catalyst of claim 12 wherein said amount of phosphate ions is about 0.5 weight % to about 10 weight %.
Claim 16
Dependent Claim
31 words
A catalyst composition of claim 8 having from about 8 to about 18 weight % chromium, calculated as chromium oxide, and from about 1 to about 9 weight % phosphate ions.
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) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |