Patent US3606329A successfully refreshed from Google Patents.
Patent US3864459A successfully refreshed from Google Patents.
US3864459A
Expired / Lapsed
US
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Process for the economical use of refractory reducing gases for the reduction of sulfur dioxide
Assignee: Individual
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Filing: 1971-03-26
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Granted: 1975-02-04
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Expires: 1991-03-26
Abstract
Abstract This invention relates to an improved process for catalytically converting sulfur dioxide to elemental sulfur, hydrogen sulfide and other sulfur containing compounds by efficiently utilizing a refractory reducing gas in the presence of a supported catalyst containing thorium oxide in combination with one or more oxides of chromium, manganese, barium, strontium, calcium, tantalum, or mixed rare earth chromites.
Inventors
- 👤 Alvin B Stiles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:32
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/16; C01B17/164; B; B01; B01J; B01J23/00; B01J23/16; B01J23/32; B01J23/34; C01B17/02; C01B17/04; C01B17/0473; C01B17/0478; C01B32/00; C01B32/70
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
144 words
IN A PROCESS OF REDUCING SULFUR DIOXIDE WITH A REFRACTORY GAS SELECTED FROM THE GROUP METHANE, ETHANE, BENZENE, NATURAL GAS AND MIXTURES THEREOF TO PRODUCE ELEMENTAL SULFUR, HYDROGEN SULFIDE, CARBONYL SULFIDE, CARBONYL DISULFIDE, ALONG WITH CARBON MONOXIDE AND ELEMENTAL HYDROGEN WHICH CAN BE FURTHER UTILIZED IN REDUCTION OF SO2, AND CARBON DIOXIDE AND WATER; THE IMPROVEMENT FOR PROVIDING SUBSTANTIALLY COMPLETE OXIDATION OF THE REFRACTORY GAS AT EFFICIENT SPACE VELOCITIES AND TEMPERATURES, WHICH COMPRISES CONTACTING, IN ESSENTIALLY STOICHIOMETRIC PROPORTION, A REACTANT GAS STREAM COMPRISING SULFUR DIOXIDE AND THE REFRACTORY REDUCING GAS WITH A SUPPORTED CATALYST SELECTED FROM THE GROUP CONSISTING OF THE OXIDES OF MANGANESE, CHROMIUM, BARIUM, STRONTIUM, CALCIUM, TATALUM, AND THE RARE EARTH CHROMITES AND MIXTURES AND SOLID STATE REACTION PRODUCTS THEREOF IN COMBINATION WITH THORIA AND LANTHANUM AT A TEMPERATURE OF AT LEAST 650*C. AT A SPACE VELOCITY OF AT LEAST 100 HR.-1.
Claim 2
Dependent Claim
144 words
IN A PROCESS OF REDUCING SULFUR DIOXIDE WITH A REFRACTORY GAS SELECTED FROM THE GROUP METHANE, ETHANE, BENZENE, NATURAL GAS AND MIXTURES THEREOF TO PRODUCE ELEMENTAL SULFUR, HYDROGEN SULFIDE, CARBONYL SULFIDE, CARBONYL DISULFIDE, ALONG WITH CARBON MONOXIDE AND ELEMENTAL HYDROGEN WHICH CAN BE FURTHER UTILIZED IN REDUCTION OF SO2, AND CARBON DIOXIDE AND WATER; THE IMPROVEMENT FOR PROVIDING SUBSTANTIALLY COMPLETE OXIDATION OF THE REFRACTORY GAS AT EFFICIENT SPACE VELOCITIES AND TEMPERATURES, WHICH COMPRISES CONTACTING, IN ESSENTIALLY STOICHIOMETRIC PROPORTION, A REACTANT GAS STREAM COMPRISING SULFUR DIOXIDE AND THE REFRACTORY REDUCING GAS WITH A SUPPORTED CATALYST SELECTED FROM THE GROUP CONSISTING OF THE OXIDES OF MANGANESE, CHROMIUM, BARIUM, STRONTIUM, CALCIUM, TATALUM, AND THE RARE EARTH CHROMITES AND MIXTURES AND SOLID STATE REACTION PRODUCTS THEREOF IN COMBINATION WITH THORIA AND LANTHANUM AT A TEMPERATURE OF AT LEAST 650*C. AT A SPACE VELOCITY OF AT LEAST 100 HR.-1.
Claim 3
Dependent Claim
13 words
The process of claim 1 in which the support is gamma-, eta-or kappa-alumina.
Claim 4
Dependent Claim
20 words
The process of claim 1 in which the space velocity is above 2000 hr. 1 and the temperature exceeds 845*C.
Claim 5
Dependent Claim
29 words
The process of claim 1 in which the catalyst is selected from the group consisting of the oxides of manganese, chromium and thorium supported on gamma-, eta- or kappa-alumina.
Claim 6
Dependent Claim
21 words
The process of claim 1 wherein the sulfur dioxide comprises from 5% to 70% by volume of the reactant gas stream.
Claim 7
Dependent Claim
21 words
The process of claim 1 wherein the surface area of the catalyst is within the range of 10 to 200 m2/g.
Claim 8
Dependent Claim
28 words
The process of claim 1 wherein the temperature is less than 925*C. and the volume percent of sulfur dioxide in the reactant stream is less than about 20%.
Claim 9
Dependent Claim
37 words
The process of claim 1 wherein the temperature is within the range of about 925*C. to 1100*C. and the volume percent of sulfur dioxide in the reactant stream is within the range Of about 20% to 70%.
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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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |