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US3956473A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for oxidizing hydrogen sulfide to sulfur by means of molecular oxygen in the presence of transition metal complexes as catalysts

Assignee: IFP Energies nouvelles
•
Filing: 1973-10-01
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Granted: 1976-05-11
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Expires: 1993-10-01
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Abstract

Abstract Catalytic oxidation of hydrogen sulfide to sulfur in homogeneous liquid phase, by means of molecular oxygen, in an organic solvent whose water content is lower than 60% by volume, said liquid phase comprising a solvent selected from amides, phosphoramides, sulfoxides, nitriles and ethers, said oxidation being conducted in the presence of at least one catalyst selected from the two following categories: A. a chelate of a transition metal selected from the group of metals consisting of iron, manganese, copper and cobalt, the chelate being selected from the group consisting of dialkyldithiocarbamates, alkylxanthates, dithiolates, 8-hydroxyquinolinates and salicylaldimines, B. a salt of said transition metal of the formula MX m in which M is the transition metal, X is an anion selected from the group consisting of Cl - , Br - , ClO 4 - , NO 3 - and SCN - and m is 2 or 3.

Inventors

  • 👤 Hubert Mimoun
  • 👤 Christian Bocard
  • 👤 Irenee Seree De Roch

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 21:31
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8603; B01D53/8612; B01D53/8615; C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/05

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 73 words
A process which comprises catalytically oxidizing hydrogen sulfide to sulfur by means of molecular oxygen, in homogeneous liquid phase, in an organic solvent having a water content not in excess of 60% by volume during the reaction, said solvent being of the basic type selected from the group consisting of amides, phosphoramides, sulfoxides, nitriles and ethers, and as a catalyst an iron dialkyldithiocarbamate, said sulfur produced thereby being pure, crystalline and easily recoverable.
Claim 2
Dependent Claim 73 words
A process which comprises catalytically oxidizing hydrogen sulfide to sulfur by means of molecular oxygen, in homogeneous liquid phase, in an organic solvent having a water content not in excess of 60% by volume during the reaction, said solvent being of the basic type selected from the group consisting of amides, phosphoramides, sulfoxides, nitriles and ethers, and as a catalyst an iron dialkyldithiocarbamate, said sulfur produced thereby being pure, crystalline and easily recoverable.
Claim 3
Dependent Claim 14 words
A process according to claim 1, conducted at a temperature from 5° to 180°C.
Claim 4
Dependent Claim 23 words
A process according to claim 1, in which the catalyst content is from 0.001 to 20% by weight, with respect to the solvent.
Claim 5
Dependent Claim 12 words
A process according to claim 1, in which the solvent is dimethylformamide.
Claim 6
Dependent Claim 23 words
A process according to claim 1, in which the catalyst has the general formula: [(C.sub.2 H.sub.5).sub.2 N - C S.sub.2 ] .sub.3 Fe.
Claim 7
Dependent Claim 31 words
A process as defined by claim 1 wherein the process is conducted in a reactor and the ratio H 2 S : O 2 is less than or equal to 2.
Claim 8
Dependent Claim 23 words
A process according to claim 6, in which the catalyst content is from 0.001 to 20% by weight, with respect to the solvent.
Claim 9
Dependent Claim 23 words
A process according to claim 6, in which the catalyst content is from 0.01 to 5% by weight, with respect to the solvent.

References Cited (Backward Citations)

GB341684A Cited
US1989004A Cited
FR1141619A Cited
US2972522A Cited
US3087793A Cited
US3363989A Cited
US3622273A Cited
US3793440A Cited
US3777010A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1979-05-11 1979-11-10 1980-05-11 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1983-05-11 1983-11-10 1984-05-11 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1987-05-11 1987-11-10 1988-05-11 $7700.00 Window Closed / Lapsed

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