US3927191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovery of sulphur from sulphur dioxide
Assignee: PPG Architectural Coatings Canada Inc
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Filing: 1971-01-21
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Granted: 1975-12-16
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Expires: 1991-01-21
Abstract
Abstract Elemental sulphur is recovered from sulphur dioxide by reduction with a hydrocarbon such as natural gas in a three stage process. The sulphur dioxide and hydrocarbon are employed in a 2:1 ratio of S:C with 50 to 60 percent of the sulphur dioxide being reacted with the hydrocarbon in the first stage and the remainder being introduced into the second stage reactor. The use of the lower ratio of sulphur dioxide to hydrocarbon in the first stage reduces the heat of reaction permitting the use of higher gas space velocities and resulting smaller size reactor.
Inventors
- 👤 Jacques Olivier Archambault
- 👤 John Douglas Mcirvine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:52
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0473; C01B17/0478
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
197 words
IN A PROCESS FOR THE REDUCTION OF SULPHUR DIOXIDE WITH HYDROCARBON GAS IN MOLAR RATIO OF SULPHUR DIOXIDE TO HYDROCARBON CALCULATED AS METHANE OF 2:1 EMPLOYING THREE REACTION STAGES IN THE PRESENCE OF CATALYST, WHEREIN DURING THE FIRST STAGE, AT 800*C. TO 1000*C., SULPHUR DIOXIDE IS REDUCED TO HYDROGEN SULPHIDE, CARBONYL SULPHIDE AND CARBON DISULPHIDE; IN THE SECOND STAGE, AT 350*C. TO 450*C. AND IN THE PRESENCE OF A CATALYST, SULPHUR DIOXIDE REACTS WITH THE CARBONYL SULPHIDE AND CARBON DISULPHIDE TO FORM ELEMENTAL SULPHUR; AND IN THE THIRD STAGE, AT 200*C. TO 275*C. AND IN THE PRESENCE OF A CATALYST, SULPHUR DIOXIDE AND HYDROGEN SULPHIDE IN 1:2 MOLAR RATIO REACT TO FORM ADDITIONAL ELEMENTAL SULPHUR, THE IMPROVEMENT WHICH COMPRISES INTRODUCING THE SULPHUR DIOXIDE IN TWO SEPARATE PORTIONS OF WHICH THE FIRST PORTION IN AMOUNT SUFFICIENT TO PROVIDE A MOLE RATIO OF SULPHUR DIOXIDE TO HYDROCARBON CALCULATED AS METHANE IN THE RANGE 1.0 TO 1.2 IS INTRODUCED IN THE FIRST REACTION STAGE, AND THE SECOND PORTION IN AMOUNT SUFFICIENT WITH ADDITION OF THE FIRST PORTION TO PROVIDE A TOTAL MOLE RATIO OF SULPHUR DIOXIDE TO HYDROCARBON CALCULATED AS METHANE OF 2.0 IS INTRODUCED IN THE SECOND REACTION STAGE.
Claim 2
Dependent Claim
197 words
IN A PROCESS FOR THE REDUCTION OF SULPHUR DIOXIDE WITH HYDROCARBON GAS IN MOLAR RATIO OF SULPHUR DIOXIDE TO HYDROCARBON CALCULATED AS METHANE OF 2:1 EMPLOYING THREE REACTION STAGES IN THE PRESENCE OF CATALYST, WHEREIN DURING THE FIRST STAGE, AT 800*C. TO 1000*C., SULPHUR DIOXIDE IS REDUCED TO HYDROGEN SULPHIDE, CARBONYL SULPHIDE AND CARBON DISULPHIDE; IN THE SECOND STAGE, AT 350*C. TO 450*C. AND IN THE PRESENCE OF A CATALYST, SULPHUR DIOXIDE REACTS WITH THE CARBONYL SULPHIDE AND CARBON DISULPHIDE TO FORM ELEMENTAL SULPHUR; AND IN THE THIRD STAGE, AT 200*C. TO 275*C. AND IN THE PRESENCE OF A CATALYST, SULPHUR DIOXIDE AND HYDROGEN SULPHIDE IN 1:2 MOLAR RATIO REACT TO FORM ADDITIONAL ELEMENTAL SULPHUR, THE IMPROVEMENT WHICH COMPRISES INTRODUCING THE SULPHUR DIOXIDE IN TWO SEPARATE PORTIONS OF WHICH THE FIRST PORTION IN AMOUNT SUFFICIENT TO PROVIDE A MOLE RATIO OF SULPHUR DIOXIDE TO HYDROCARBON CALCULATED AS METHANE IN THE RANGE 1.0 TO 1.2 IS INTRODUCED IN THE FIRST REACTION STAGE, AND THE SECOND PORTION IN AMOUNT SUFFICIENT WITH ADDITION OF THE FIRST PORTION TO PROVIDE A TOTAL MOLE RATIO OF SULPHUR DIOXIDE TO HYDROCARBON CALCULATED AS METHANE OF 2.0 IS INTRODUCED IN THE SECOND REACTION STAGE.
Claim 3
Dependent Claim
24 words
A process as claimed in claim 1 wherein the catalyst is selected from the group consisting of activated alumina, bauxite, calcium sulphide and quartz.
Claim 4
Dependent Claim
13 words
A process as claimed in claim 1 wherein the hydrocarbon is natural gas.
Claim 5
Dependent Claim
28 words
A process as claimed in claim 1 wherein the hydrocarbon is selected from the group consisting of methane, ethane, propane, butane, pentane, hexane and mixtures of the same.
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) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |