US4547525A
Expired / Lapsed
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Reducing methane production in Fischer-Tropsch reactions
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1983-12-19
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Granted: 1985-10-15
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Expires: 2003-12-19
Abstract
Abstract Methane production in catalytic Fischer-Tropsch hydrocarbon synthesis reactions is reduced by adding olefins to the H2 and CO feed mixture. Alpha olefins of ten carbon atoms or less are particularly preferred.
Inventors
- 👤 Chang J. Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:35
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/02; C07C1/04; C07C1/06; C07C2521/00; C07C2521/06; C07C2523/00; C07C2523/70; C07C2523/72; C07C2523/74; C07C2523/745; C07C2523/76; C07C2523/78
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
102 words
A process for reducing methane formation in a Fischer-Tropsch process for synthesizing hydrocarbons which comprises contacting, at an elevated temperature of 100°-500° C. and a pressure of from about 100-10,000 kPa, a H 2 /CO feed mixture with a heterogeneous catalyst comprising one or more Group VIII metals supported on an inorganic refractory oxide support for a time sufficient to produce hydrocarbons, including methane, wherein one or more olefins is added to the H 2 /CO feed mixture in an amount sufficient to reduce said methane formation to a level lower than it would be without adding said olefin to said feed.
Claim 2
Dependent Claim
102 words
A process for reducing methane formation in a Fischer-Tropsch process for synthesizing hydrocarbons which comprises contacting, at an elevated temperature of 100°-500° C. and a pressure of from about 100-10,000 kPa, a H 2 /CO feed mixture with a heterogeneous catalyst comprising one or more Group VIII metals supported on an inorganic refractory oxide support for a time sufficient to produce hydrocarbons, including methane, wherein one or more olefins is added to the H 2 /CO feed mixture in an amount sufficient to reduce said methane formation to a level lower than it would be without adding said olefin to said feed.
Claim 3
Dependent Claim
32 words
The process of claim 1 wherein one or more olefins are added to said feed in an amount, based on an olefin to CO mole ratio, ranging from about 1/100 to 5/1.
Claim 4
Dependent Claim
14 words
The process of claim 2 wherein said olefin comprises one or more alpha olefins.
Claim 5
Dependent Claim
16 words
The process of claim 3 wherein said alpha olefin is of the type R--CH═CH 2 .
Claim 6
Dependent Claim
13 words
The process of claim 4 wherein R is hydrogen or an alkyl group.
Claim 7
Dependent Claim
18 words
The process of claim 5 wherein said olefin comprises one or more C 2 -C 10 alpha olefins.
Claim 8
Dependent Claim
16 words
The process of claim 6 wherein said olefin to CO mole ratio ranges from about 1/10-3/4.
Claim 9
Dependent Claim
16 words
The process of claim 7 wherein the temperature of said process ranges from about 200°-300° C.
Claim 10
Dependent Claim
24 words
The process of claim 8 wherein the mole ratio of H 2 to CO in the gas feed ranges from about 0.5 to 10.
Claim 11
Dependent Claim
101 words
A process for reducing methane formation in a Fischer-Tropsch process for synthesizing hydrocarbons which comprises contacting, at an elevated temperature of 100°-500° C. and a pressure of from 100-10,000 kPa, a gas feed comprising a mixture of H 2 and CO with a heterogeneous catalyst comprising ruthenium supported on an inorganic refractory oxide support for a time sufficient to produce hydrocarbons, including methane, wherein one or more olefins is added to the H 2 /CO feed mixture in an amount sufficient to reduce said methane formation to a level lower than it would be without adding said olefin to said feed.
Claim 12
Dependent Claim
101 words
A process for reducing methane formation in a Fischer-Tropsch process for synthesizing hydrocarbons which comprises contacting, at an elevated temperature of 100°-500° C. and a pressure of from 100-10,000 kPa, a gas feed comprising a mixture of H 2 and CO with a heterogeneous catalyst comprising ruthenium supported on an inorganic refractory oxide support for a time sufficient to produce hydrocarbons, including methane, wherein one or more olefins is added to the H 2 /CO feed mixture in an amount sufficient to reduce said methane formation to a level lower than it would be without adding said olefin to said feed.
Claim 13
Dependent Claim
14 words
The process of claim 10 wherein said olefin comprises at least one alpha olefin.
Claim 14
Dependent Claim
23 words
The process of claim 11 wherein said alpha olefin is of the type R--CH═CH 2 wherein R is hydrogen or an alkyl group.
Claim 15
Dependent Claim
16 words
The process of claim 11 wherein said olefin comprises a C 2 -C 10 alpha olefin.
Claim 16
Dependent Claim
28 words
The process of either of claim 11 or 12 wherein the amount of olefin present, on an olefin to CO mole ratio, ranges from about 1/100 to 5/1.
Claim 17
Dependent Claim
13 words
The process of claim 14 wherein said temperature ranges from about 200°-300° C.
Claim 18
Dependent Claim
23 words
The process of claim 10 wherein the mole ratio of H 2 to CO of the feed ranges from about 0.5 to 10.
Claim 19
Dependent Claim
23 words
The process of any of claims 1, 5 or 9 wherein said supported Group VIII metal comprises iron combined with copper and potassium.
Claim 20
Dependent Claim
17 words
The process of any of claims 10, 12 or 15 wherein said catalyst support comprises titanium dioxide.
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) | 1988-10-14 | 1989-04-15 | 1989-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-14 | 1993-04-15 | 1993-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-14 | 1997-04-15 | 1997-10-15 | $7700.00 | Window Closed / Lapsed |