US3972988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfur production
Assignee: Universal Oil Products Co
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Filing: 1975-05-05
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Granted: 1976-08-03
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Expires: 1995-05-05
Abstract
Abstract A process is disclosed for the production of sulfur which comprises the oxidation of a sulfide solution in the presence of a catalyst comprising a metal phthalocyanine compound to produce sulfur and a polysulfide effluent, decomposition of the polysulfide effluent with steam at a temperature of from about 115° to about 125°C. and a pressure of 10 psig, to about 20 psig. to produce a vaporous phase effluent containing water, hydrogen sulfide and ammonia, the oxidation of at least a portion of the vaporous effluent with an oxygen-containing gas in the presence of a catalyst comprising a metal phthalocyanine compound dispersed on a solid support, said catalyst being in contact with a liquid phase comprising a thiosulfate-containing compound, at a temperature of from about 115° to about 125°C. and a pressure of from about 10 psig. to about 20 psig. to produce steam, sulfur and a thiosulfate compound and the recovery of the resultant sulfur.
Inventors
- 👤 Peter Urban
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:01
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/05
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
168 words
In a process for the preparation of sulfur by contacting an aqueous ammonium sulfide solution with an oxygen-containing gas in the presence of a metal phthalocyanine catalyst at polysulfide-forming conditions to produce sulfur and a polysulfide effluent, the improvement which comprises the steps of a. decomposing at least a portion of said polysulfide effluent with steam at a temperature of from about 115° to about 125° C. and a pressure of about 10 psig. to about 20 psig. to produce a vaporous effluent comprising water, hydrogen sulfide and ammonia; b. contacting at least a portion of said vaporous effluent with an oxygen-containing gas in the presence of a metal phthalocyanine catalyst dispersed on a solid support, said metal phthalocyanine catalyst being in contact with a liquid phase comprising a thiosulfate-containing compound, at a temperature of from about 115° to about 125° C. and a pressure of from about 10 psig. to about 20 psig. to produce steam, sulfur and a thiosulfate compound; and c. recovering the resultant sulfur.
Claim 2
Dependent Claim
168 words
In a process for the preparation of sulfur by contacting an aqueous ammonium sulfide solution with an oxygen-containing gas in the presence of a metal phthalocyanine catalyst at polysulfide-forming conditions to produce sulfur and a polysulfide effluent, the improvement which comprises the steps of a. decomposing at least a portion of said polysulfide effluent with steam at a temperature of from about 115° to about 125° C. and a pressure of about 10 psig. to about 20 psig. to produce a vaporous effluent comprising water, hydrogen sulfide and ammonia; b. contacting at least a portion of said vaporous effluent with an oxygen-containing gas in the presence of a metal phthalocyanine catalyst dispersed on a solid support, said metal phthalocyanine catalyst being in contact with a liquid phase comprising a thiosulfate-containing compound, at a temperature of from about 115° to about 125° C. and a pressure of from about 10 psig. to about 20 psig. to produce steam, sulfur and a thiosulfate compound; and c. recovering the resultant sulfur.
Claim 3
Dependent Claim
35 words
The process of claim 1 further characterized in that the polysulfide-formation conditions include a temperature of from about 0° to about 200° C. and a pressure of from about 1 atmosphere to about 100 atmospheres.
Claim 4
Dependent Claim
17 words
The improvement of claim 1 further characterized in that said thiosulfate-containing compound is an ammonical thiosulfate compound.
Claim 5
Dependent Claim
15 words
The improvement of claim 3 further characterized in that the thiosulfate-containing compound is ammonium thiosulfate.
Claim 6
Dependent Claim
19 words
The improvement of claim 1 further characterized in that the steam of step (b) is recycled to step (a).
Claim 7
Dependent Claim
18 words
The process of claim 1 further characterized in that elemental sulfur is recovered by filtering said polysulfide effluent.
Claim 8
Dependent Claim
16 words
The process of claim 1 further characterized in that the metal phthalocyanine catalyst comprises cobalt phthalocyanine.
Claim 9
Dependent Claim
16 words
The process of claim 1 further characterized in that the metal phthalocyanine catalyst comprises vanadium phthalocyanine.
Claim 10
Dependent Claim
14 words
The improvement of claim 1 further characterized in that the solid support comprises charcoal.
Claim 11
Dependent Claim
14 words
The improvement of claim 1 further characterized in that the solid support comprises γ-alumina.
Claim 12
Dependent Claim
14 words
The process of claim 1 further characterized in that the oxygen-containing gas is air.
Claim 13
Dependent Claim
14 words
The process of claim 1 further characterized in that the oxygen-containing gas is oxygen.
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) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |