# US 4,399,112 A · Process for the catalytic incineration of residual gases containing a low content of at least one sulfur compound selected from COS, CS.sub.2 and the mercaptans and possibility at least one member of the group > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,399,112 A - Document ID: US4399112A - Status: Granted - Kind: A - Application number: 06/255,995 - Filed: 1981-04-21 - Granted: 1983-08-16 - Earliest claimed: 1980-04-23 - Assignees: Societe Nationale Elf Aquitaine - Inventors: Robert Voirin - Web page: https://patentgrep.com/patent/US4399112A ## CPC - B01D 53/8606: {only one sulfur compound other than sulfur oxides or hydrogen sulfide} - B01D 53/8603: {Removing sulfur compounds} - C01B 17/0456: {the hydrogen sulfide-containing gas being a Claus process tail gas} - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C} ## Abstract A process for the catalytic incineration of residual gases containing a low content of H.sub.2 S and/or SO.sub.2, organic compounds of sulfur such as COS, CS.sub.2, mercaptans and possibly vapor and/or vesicular sulfur, comprising a hydrogenation stage which transforms all the sulfur compounds into H.sub.2 S followed by a catalytic oxidation stage to transform H.sub.2 S into SO.sub.2. The catalyst used in the oxidation stage consists in a porous support, having a surface area of at least 5 m.sup.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.sub.2 S into SO.sub.2, this yield being maintained steadily throughout the process. ## Claims ### Claim 1 A process for the catalytic incineration of residual gases containing a low content of at least one sulfur compound selected from COS, CS.sub.2 and mercaptans, comprising: hydrogenating the residual gas to react said sulfur compound contained therein to form H.sub.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.degree. C. and 570.degree. C. to thereby oxidize H.sub.2 S to SO.sub.2, wherein the oxidation catalyst comprises a porous support having a surface area of at least 5 m.sup.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.sub.2, zirconium oxides expressed as ZrO.sub.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 (depends on 1) A process according to claim 1, wherein the oxidation catalyst support has a surface area ranging from 20 m.sup.2 /g to 800 m.sup.2 /g. ### Claim 3 (depends on 1) A process according to claim 1, wherein the oxidation catalyst support has a surface area ranging from 50 m.sup.2 /g to 600 m.sup.2 /g. ### Claim 4 (depends on 1) A process according to claim 1, wherein the iron content of the catalyst is between 0.5 and 10% by weight. ### Claim 5 (depends on 1) 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 6 (depends on 1) 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 7 (depends on 1) A process according to claim 1 wherein the residual gas additionally contains at least one sulfur containing composition selected from H.sub.2 S, SO.sub.2 and sulfur. ### Claim 8 A process for the catalytic incineration of residual gases containing a low content of at least one sulfur compound selected from COS, CS.sub.2 and mercaptans, comprising: hydrogenating the residual gas to react said sulfur compound contained therein to form H.sub.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.degree. C. and 570.degree. C. to thereby oxidize H.sub.2 S to SO.sub.2, wherein the oxidation catalyst comprises a porous support having a surface area of at least 5 m.sup.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.sub.2, zirconium oxides expressed as ZrO.sub.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 9 (depends on 8) A process according to claim 8, wherein the oxidation catalyst support has a surface area ranging from 20 m.sup.2 /g to 800 m.sup.2 /g. ### Claim 10 (depends on 8) A process according to claim 8, wherein the oxidation catalyst support has a surface area ranging from 50 m.sup.2 /g to 600 m.sup.2 /g. ### Claim 11 (depends on 8) 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 12 (depends on 8) A process to claim 8, wherein the iron compound is iron sulphate. ### Claim 13 (depends on 8) A process according to claim 8, wherein the precious metal is palladium. ### Claim 14 (depends on 8) 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 15 (depends on 8) A process according to claim 8, wherein the iron content of the oxidation catalyst is between 0.5 to 10% by weight. ### Claim 16 (depends on 8) 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 17 (depends on 8) A process according to claim 8, wherein the residual gas additionally contains at least one sulfur composition selected from H.sub.2 S, SO.sub.2 and sulfur.