Patent US3999961A successfully refreshed from Google Patents.
US3999961A
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US
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Sulfur control over carbon formation in high temperature reforming operations
Assignee: Parsons Government Services Inc
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Filing: 1975-10-28
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Granted: 1976-12-28
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Expires: 1995-10-28
Abstract
Abstract Hydrogen sulfide replaces a portion of the water required to suppress the formation of carbon in gas phase catalytic reforming and hydrocracking processes of hydrocarbons, particularly aromatics. Hydrogen is present to prevent carbon formation from the hydrocarbons.
Inventors
- 👤 Gerald A. White
- 👤 Theodore R. Roszkowski
- 👤 Harold W. Fleming
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:42
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/02; C01B3/32; C01B3/34; C01B3/38
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
136 words
In a process for the reforming of hydrocarbons wherein a gaseous stream comprising a hydrocarbon and water as steam is contacted with a supported reforming catalyst at a temperature from about 900° F to about 1600° F, and in which water is present in an excess amount above the stoichiometric amount required for reforming to prevent the formation of carbon, the improvement which comprises providing in the gaseous stream undergoing reforming at least 1 part per million hydrogen sulfide in place of at least a portion of the excess water required to prevent carbon formation, and providing during reforming a source of hydrogen selected from the group consisting of free hydrogen, carbon monoxide, and mixtures thereof in an amount at least sufficient for the stoichiometric conversion of all of the carbon in the hydrocarbon to methane.
Claim 2
Dependent Claim
136 words
In a process for the reforming of hydrocarbons wherein a gaseous stream comprising a hydrocarbon and water as steam is contacted with a supported reforming catalyst at a temperature from about 900° F to about 1600° F, and in which water is present in an excess amount above the stoichiometric amount required for reforming to prevent the formation of carbon, the improvement which comprises providing in the gaseous stream undergoing reforming at least 1 part per million hydrogen sulfide in place of at least a portion of the excess water required to prevent carbon formation, and providing during reforming a source of hydrogen selected from the group consisting of free hydrogen, carbon monoxide, and mixtures thereof in an amount at least sufficient for the stoichiometric conversion of all of the carbon in the hydrocarbon to methane.
Claim 3
Dependent Claim
33 words
A process as claimed in claim 1 in which a portion of the excess water is replaced by hydrogen sulfide in an amount of from about 2 to about 5000 parts per million.
Claim 4
Dependent Claim
32 words
A process as claimed in claim 1 in which a portion of the excess water is replaced by hydrogen sulfide in an amount of from about 10 to 1000 parts per million.
Claim 5
Dependent Claim
23 words
A process as claimed in claim 1 in which reforming occurs in a temperature range of from 1000° F to about 1500° F.
Claim 6
Dependent Claim
34 words
A process as claimed in claim 1 in which the hydrogen sulfide is formed from sulfur species selected from the group consisting of carbonyl sulfide, carbon disulfide, sulfur dioxide, thiophenes, mercaptans and mixtures thereof.
Claim 7
Dependent Claim
14 words
A process as claimed in claim 1 in which the hydrocarbon includes aromatic hydrocarbons.
Claim 8
Dependent Claim
128 words
In a process for the reforming of hydrocarbons wherein a gaseous stream comprising a hydrocarbon and water as steam is contacted with a supported reforming catalyst at a temperature from about 900° F to about 1600° F, and in which water is present in an excess amount above the stoichiometric amount required for reforming to suppress the formation of carbon, the improvement which comprises replacing at least a portion of the excess water required to prevent the formation of carbon with from about 2 to about 5000 parts per million hydrogen sulfide, and providing a source of hydrogen selected from the group consisting of hydrogen, carbon monoxide and mixtures thereof in an amount at least sufficient for the stoichiometric conversion of the carbon in the hydrocarbon to methane.
Claim 9
Dependent Claim
128 words
In a process for the reforming of hydrocarbons wherein a gaseous stream comprising a hydrocarbon and water as steam is contacted with a supported reforming catalyst at a temperature from about 900° F to about 1600° F, and in which water is present in an excess amount above the stoichiometric amount required for reforming to suppress the formation of carbon, the improvement which comprises replacing at least a portion of the excess water required to prevent the formation of carbon with from about 2 to about 5000 parts per million hydrogen sulfide, and providing a source of hydrogen selected from the group consisting of hydrogen, carbon monoxide and mixtures thereof in an amount at least sufficient for the stoichiometric conversion of the carbon in the hydrocarbon to methane.
Claim 10
Dependent Claim
23 words
A process as claimed in claim 7 in which reforming occurs in a temperature range of from 1000° F to about 1500° F.
Claim 11
Dependent Claim
33 words
A process as claimed in claim 7 in which a portion of the excess water is replaced by hydrogen sulfide in an amount of from about 2 to about 5000 parts per million.
Claim 12
Dependent Claim
34 words
A process as claimed in claim 7 in which the hydrogen sulfide is formed from sulfur species selected from the group consisting of carbonyl sulfide, carbon disulfide, sulfur dioxide, thiophenes, mercaptans and mixtures thereof.
Claim 13
Dependent Claim
119 words
A process for reforming aromatic hydrocarbons which comprises passing a gaseous stream comprising aromatic hydrocarbons and water as steam, hydrogen sulfide in a concentration of from about 2 to about 5000 parts per million in place of at least a portion of the excess water required to prevent the formation of carbon from the aromatic hydrocarbon and a source of hydrogen selected from the group consisting of hydrogen, carbon monoxide, and mixtures thereof, in an amount at least sufficient for the stoichiometric conversion of the carbon in the aromatic hydrocarbons to methane with a supported reforming catalyst at a temperature of from about 900° F to about 1600° F to reform the aromatic hydrocarbons without the formation of carbon.
Claim 14
Dependent Claim
119 words
A process for reforming aromatic hydrocarbons which comprises passing a gaseous stream comprising aromatic hydrocarbons and water as steam, hydrogen sulfide in a concentration of from about 2 to about 5000 parts per million in place of at least a portion of the excess water required to prevent the formation of carbon from the aromatic hydrocarbon and a source of hydrogen selected from the group consisting of hydrogen, carbon monoxide, and mixtures thereof, in an amount at least sufficient for the stoichiometric conversion of the carbon in the aromatic hydrocarbons to methane with a supported reforming catalyst at a temperature of from about 900° F to about 1600° F to reform the aromatic hydrocarbons without the formation of carbon.
Claim 15
Dependent Claim
33 words
A process as claimed in claim 11 in which a portion of the excess water is replaced by hydrogen sulfide in an amount of from about 10 to about 1000 parts per million.
Claim 16
Dependent Claim
23 words
A process as claimed in claim 11 in which reforming occurs in a temperature range of from 1000° F to about 1500° F.
Claim 17
Dependent Claim
34 words
A process as claimed in claim 11 in which the hydrogen sulfide is formed from sulfur species selected from the group consisting of carbonyl sulfide, carbon disulfide, sulfur dioxide, thiophenes, mercaptans and mixtures thereof.
References Cited (Backward Citations)
US3103423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |