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US4399112A
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Process for the catalytic incineration of residual gases containing a low content of at least one sulfur compound selected from COS, CS2 and the mercaptans and possibility at least one member of the group
Assignee: Societe National Elf Aquitaine
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Filing: 1981-04-21
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Granted: 1983-08-16
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Expires: 2001-04-21
Abstract
Abstract A process for the catalytic incineration of residual gases containing a low content of H 2 S and/or SO 2 , organic compounds of sulfur such as COS, CS 2 , mercaptans and possibly vapor and/or vesicular sulfur, comprising a hydrogenation stage which transforms all the sulfur compounds into H 2 S followed by a catalytic oxidation stage to transform H 2 S into SO 2 . The catalyst used in the oxidation stage consists in a porous support, having a surface area of at least 5 m 2 /g and containing, by weight, 50 to 100% of a product selected from the group comprising titanium or zirconium oxides, silica and zeolites, and 50 to 0% alumina, to which is associated one or several compounds of metals belonging to the group formed by Cu, Ag, Zn, Cd, Y, Lanthanides, V, Cr, Mo, W, Mn, Fe, Co, Rh, Ir, Ni, Pd, Pt, Sn and Bi. The use of such an oxidation catalyst leads to a practically quantitative yield of conversion of H 2 S into SO 2 , this yield being maintained steadily throughout the process.
Inventors
- 👤 Robert Voirin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:03
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8603; B01D53/8606; C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0404; C01B17/0456
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
169 words
A process for the catalytic incineration of residual gases containing a low content of at least one sulfur compound selected from COS, CS 2 and mercaptans, comprising: hydrogenating the residual gas to react said sulfur compound contained therein to form H 2 S; and contacting the hydrogenated residual gas with an oxygen-containing gas in the presence of an oxidation catalyst at a temperature between about 150° C. and 570° C. to thereby oxidize H 2 S to SO 2 , wherein the oxidation catalyst comprises a porous support having a surface area of at least 5 m 2 /g consisting essentially of from about 50 to 100% by weight of at least one composition selected from the group consisting of titanium oxides expressed as TiO 2 , zirconium oxides expressed as ZrO 2 , silica, zeolites and mixtures thereof and from 50 to 0% by weight alumina, and iron sulphate in an amount such that the iron content of the catalyst is between about 0.1 and 15% by weight.
Claim 2
Dependent Claim
169 words
A process for the catalytic incineration of residual gases containing a low content of at least one sulfur compound selected from COS, CS 2 and mercaptans, comprising: hydrogenating the residual gas to react said sulfur compound contained therein to form H 2 S; and contacting the hydrogenated residual gas with an oxygen-containing gas in the presence of an oxidation catalyst at a temperature between about 150° C. and 570° C. to thereby oxidize H 2 S to SO 2 , wherein the oxidation catalyst comprises a porous support having a surface area of at least 5 m 2 /g consisting essentially of from about 50 to 100% by weight of at least one composition selected from the group consisting of titanium oxides expressed as TiO 2 , zirconium oxides expressed as ZrO 2 , silica, zeolites and mixtures thereof and from 50 to 0% by weight alumina, and iron sulphate in an amount such that the iron content of the catalyst is between about 0.1 and 15% by weight.
Claim 3
Dependent Claim
26 words
A process according to claim 1, wherein the oxidation catalyst support has a surface area ranging from 20 m 2 /g to 800 m 2 /g.
Claim 4
Dependent Claim
26 words
A process according to claim 1, wherein the oxidation catalyst support has a surface area ranging from 50 m 2 /g to 600 m 2 /g.
Claim 5
Dependent Claim
20 words
A process according to claim 1, wherein the iron content of the catalyst is between 0.5 and 10% by weight.
Claim 6
Dependent Claim
24 words
A process according to claim 1, wherein the oxidation catalyst support is selected from the group consisting of silica, titanium oxide, and zirconium oxide.
Claim 7
Dependent Claim
35 words
A process according to claim 1, wherein the residual gas to be incinerated is a residual gas from a Claus sulfur manufacturing plant, said residual gas having been treated to reduce its sulfur compound content.
Claim 8
Dependent Claim
27 words
A process according to claim 1 wherein the residual gas additionally contains at least one sulfur containing composition selected from H 2 S, SO 2 and sulfur.
Claim 9
Dependent Claim
209 words
A process for the catalytic incineration of residual gases containing a low content of at least one sulfur compound selected from COS, CS 2 and mercaptans, comprising: hydrogenating the residual gas to react said sulfur compound contained therein to form H 2 S; and contacting the hydrogenated residual gas with an oxygen-containing gas in the presence of an oxidation catalyst at a temperature between about 150° C. and 570° C. to thereby oxidize H 2 S to SO 2 , wherein the oxidation catalyst comprises a porous support having a surface area of at least 5 m 2 /g consisting essentially of from 50 to 100% by weight of at least one composition selected from the group consisting of titanium oxides expressed as TiO 2 , zirconium oxides expressed as ZrO 2 , silica, zeolites and mixtures thereof and from 50 to 0% by weight alumina, an iron compound and at least one compound of a precious metal selected from the group consisting of rhodium, palladium, iridium, and platinum, in an amount such that the iron content of the catalyst is between 0.1 and 15% by weight and that the ratio of the number of iron atoms to the number of precious metal atoms is between 20 and 1,000.
Claim 10
Dependent Claim
209 words
A process for the catalytic incineration of residual gases containing a low content of at least one sulfur compound selected from COS, CS 2 and mercaptans, comprising: hydrogenating the residual gas to react said sulfur compound contained therein to form H 2 S; and contacting the hydrogenated residual gas with an oxygen-containing gas in the presence of an oxidation catalyst at a temperature between about 150° C. and 570° C. to thereby oxidize H 2 S to SO 2 , wherein the oxidation catalyst comprises a porous support having a surface area of at least 5 m 2 /g consisting essentially of from 50 to 100% by weight of at least one composition selected from the group consisting of titanium oxides expressed as TiO 2 , zirconium oxides expressed as ZrO 2 , silica, zeolites and mixtures thereof and from 50 to 0% by weight alumina, an iron compound and at least one compound of a precious metal selected from the group consisting of rhodium, palladium, iridium, and platinum, in an amount such that the iron content of the catalyst is between 0.1 and 15% by weight and that the ratio of the number of iron atoms to the number of precious metal atoms is between 20 and 1,000.
Claim 11
Dependent Claim
26 words
A process according to claim 8, wherein the oxidation catalyst support has a surface area ranging from 20 m 2 /g to 800 m 2 /g.
Claim 12
Dependent Claim
26 words
A process according to claim 8, wherein the oxidation catalyst support has a surface area ranging from 50 m 2 /g to 600 m 2 /g.
Claim 13
Dependent Claim
27 words
A process according to claim 8, wherein the oxidation catalyst support is selected from the group consisting of silica, titanium oxide, zirconium oxide and a mixture thereof.
Claim 14
Dependent Claim
12 words
A process to claim 8, wherein the iron compound is iron sulphate.
Claim 15
Dependent Claim
12 words
A process according to claim 8, wherein the precious metal is palladium.
Claim 16
Dependent Claim
27 words
A process according to claim 8, wherein the ratio of the number of iron atoms to the number of precious metal atoms is between 50 and 400.
Claim 17
Dependent Claim
21 words
A process according to claim 8, wherein the iron content of the oxidation catalyst is between 0.5 to 10% by weight.
Claim 18
Dependent Claim
35 words
A process according to claim 8, wherein the residual gas to be incinerated is a residual gas from a Claus sulfur manufacturing plant, said residual gas having been treated to reduce its sulfur compound content.
Claim 19
Dependent Claim
26 words
A process according to claim 8, wherein the residual gas additionally contains at least one sulfur composition selected from H 2 S, SO 2 and sulfur.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1986-08-15 | 1987-02-14 | 1987-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-15 | 1991-02-14 | 1991-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-15 | 1995-02-14 | 1995-08-16 | $7700.00 | Window Closed / Lapsed |