WO2020254578A1 - Method and catalyst for selective oxidation of hydrogen sulfide to elemental sulfur in a reducing gas - Google Patents

Method and catalyst for selective oxidation of hydrogen sulfide to elemental sulfur in a reducing gas Download PDF

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Publication number
WO2020254578A1
WO2020254578A1 PCT/EP2020/067102 EP2020067102W WO2020254578A1 WO 2020254578 A1 WO2020254578 A1 WO 2020254578A1 EP 2020067102 W EP2020067102 W EP 2020067102W WO 2020254578 A1 WO2020254578 A1 WO 2020254578A1
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gas
catalyst
elemental sulfur
catalytic reactor
sulfur
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PCT/EP2020/067102
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French (fr)
Inventor
Niklas Bengt Jakobsson
Per Aggerholm SØRENSEN
Peter Bo Olsen
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Haldor Topsøe A/S
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/02—Preparation of sulfur; Purification
    • C01B17/04—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides
    • C01B17/0404—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides by processes comprising a dry catalytic conversion of hydrogen sulfide-containing gases, e.g. the Claus process
    • C01B17/0426—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides by processes comprising a dry catalytic conversion of hydrogen sulfide-containing gases, e.g. the Claus process characterised by the catalytic conversion
    • C01B17/043—Catalytic converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8603—Removing sulfur compounds
    • B01D53/8612—Hydrogen sulfide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/10—Oxidants
    • B01D2251/102—Oxygen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/202—Hydrogen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20738—Iron
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20792—Zinc
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2256/00—Main component in the product gas stream after treatment
    • B01D2256/24—Hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/302—Sulfur oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/304—Hydrogen sulfide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/308—Carbonoxysulfide COS
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8603—Removing sulfur compounds
    • B01D53/8609—Sulfur oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/869—Multiple step processes

Definitions

  • the present invention relates to a method and a catalyst for selectively converting hydrogen sulfide (3 ⁇ 4S) to ele mental sulfur (S) in a reducing gas.
  • the Applicant has developed the POC catalyst (preferential oxidation catalyst) and the POC process used to treat 3 ⁇ 4S containing off-gas from the viscose industry, where the specific POC catalyst does catalyze the 3 ⁇ 4S to S reaction, but has a very low activity for the Claus reaction, which means that the reaction of 3 ⁇ 4S to S is not reversed, even at the very high oxygen levels present in viscose off-gas. Furthermore, because the viscose off-gas contains particu late matter and due to the advantages of a high surface area and a low diffusion resistance, the POC catalyst is in monolithic form. The result is that plugging is avoided, and a high reaction rate and low formation of by-products can be achieved.
  • the specific POC catalyst does catalyze the 3 ⁇ 4S to S reaction, but has a very low activity for the Claus reaction, which means that the reaction of 3 ⁇ 4S to S is not reversed, even at the very high oxygen levels present in viscose off-gas.
  • Applicant's WO 2018/065173 concerns a method for cleaning an off-gas from viscose production, essentially containing 3 ⁇ 4S and CS2, in which the gas is passed through a catalytic reactor containing a direct oxidation type catalyst, such as V2O5 on silica, to convert 3 ⁇ 4S in the gas to elemental sulfur, SO2 or mixtures thereof, either via the oxygen pre sent in the gas or via oxygen added to the gas stream.
  • the elemental sulfur and SO2 are removed from the effluent gas from the catalytic reactor, and the unconverted CS2 is re cycled to the viscose production process.
  • the 3 ⁇ 4S concentration in the gas leaving the last catalytic stage is controlled to between 0.8 and 3 vol%, and then the gas is introduced into a heat exchanger having a wall temperature below the solidification point of sulfur and above the dew point of water, wherein the sulfur depos- its on the heat exchanger wall and is removed with the aid of gravity.
  • a POC catalyst system with dual pressure-drop sensors es pecially for use in treating diesel engine exhaust, is de- scribed in US 2013/0327019, while catalysts and catalytic methods for selective oxidation of 3 ⁇ 4S in a gas stream con taining one or more oxidizable components other than 3 ⁇ 4S to generate SO2, elemental sulfur or both are described in WO 03/082455.
  • the Lo-Cat technology was developed to provide an isother mal, low operating cost method for carrying out a modified Claus reaction. It comprises a proprietary liquid Fe 3+ re dox catalyst that converts 3 ⁇ 4S to solid elemental sulfur by direct oxidation of 3 ⁇ 4S (3 ⁇ 4S + 1 ⁇ 2 O2 3 ⁇ 40 + S) .
  • This reac tion consists of five sequential steps: Absorption of 3 ⁇ 4S, ionization of 3 ⁇ 4S, catalytic oxidation of sulfide, absorp tion of oxygen and iron oxidation to get Fe 2+ back to the Fe 3+ state.
  • Applicant's POC catalyst is ca- pable of selectively converting 3 ⁇ 4S to elemental S in a re ducing gas containing 3 ⁇ 4 and CO (i.e. a syngas) by using the oxygen that is sometimes present in the gas and/or by adding oxygen.
  • the sulfur can then be removed by condensa- tion or by using a liquid contactor. This is very attrac tive in the application of the POC catalyst to remove sul fur from coke oven gas and synthesis gas from coal gasifi cation, biomass gasification and waste gasification.
  • Applicant's POC monolith catalyst is a monolithic catalyst where a silica carrier is embedded in the walls of a corru gated monolith made from a fiberglass sheet matrix.
  • the silica carrier is impregnated with an iron catalyst, op tionally in combination with zinc oxide.
  • the catalyst se- lectively oxidizes the 3 ⁇ 4S, which is present in a syngas, into elemental sulfur.
  • the by-products are SO2 and carbonyl sulfide (COS) .
  • COS carbonyl sulfide
  • the present invention relates to a method for selec tively converting hydrogen sulfide (3 ⁇ 4S) to elemental sul fur (S) in a reducing gas containing 3 ⁇ 4 and CO, comprising the steps of
  • the catalyst to be used in the method is preferably a mono lithic catalyst comprising a silica carrier impregnated with an iron catalyst and embedded in the walls of a corru gated monolith made from a fiberglass matrix.
  • the catalyst is a monolithic catalyst comprising a silica carrier impregnated with an iron catalyst and em bedded in the walls of a corrugated monolith made from a fiberglass matrix.
  • the iron catalyst can advantageously be combined with zinc oxide .
  • the iron compound is combined with zinc oxide. It is preferred that the iron compound in the catalyst according to the in vention contains from 1 to 15 wt% iron.
  • Another way to mitigate the by-product issue would be to minimize the by-product formation through improving the catalyst selectivity.
  • the catalyst carrier is not active for the Claus reac tion.
  • silica is a suitable carrier, and cerium oxide and possibly zirconia may be candidates.
  • the temperature operation window can also be adjusted in order to maximize the yield of elemental S.
  • Cr and Fe/Cr catalysts may work, but chromium is a challenging component to work with from an EHS (Environment, Health and Safety) perspective.
  • Mn and Cu, and combinations thereof, are in teresting candidates, and vanadium oxide is another inter esting candidate, where the lower oxides V2O3 and VO2 pro- mote the selective oxidation of 3 ⁇ 4S to S.
  • these catalysts must be supported on a carrier that is not active in the Claus reaction.
  • the invention presents a more simple and effective way to remove sulfur from coke oven gas and syngas from coal gasi fication, biomass gasification and waste gasification.
  • the method is suitable for low and medium high sulfur contents.
  • the technology is low in CAPEX and has a low OPEX due to the fact that no additional chemicals are needed to remove the sulfur compounds.
  • the technology can be combined with 3 ⁇ 4S sorbent technology and further combined with hydrogenation of any slip of sul fur components.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Catalysts (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

In a method for selectively converting hydrogen sulfide (H2S) to elemental sulfur (S) in a reducing gas containing H2 and CO, the gas is passed through a catalytic reactor containing a catalyst that selectively converts (H2S) in the gas to elemental sulfur, either via the oxygen present in the gas or via oxygen added to the gas stream. The elemental sulfur is removed from the effluent gas from the catalytic reactor by condensation or by contact with a liquid contactor, and the by-products SO2 and COS can be hydrogenated back to (H2S) and fed to the catalytic reactor for another conversion to elemental sulfur.

Description

Method and catalyst for selective oxidation of hydrogen sulfide to elemental sulfur in a reducing gas
The present invention relates to a method and a catalyst for selectively converting hydrogen sulfide (¾S) to ele mental sulfur (S) in a reducing gas.
It is known from the refinery industry that the selective reaction of ¾S to form elemental S can be favorably cata- lyzed, and it is used as a final catalytic reaction step connected to the Claus technology under the trade names Su- perClaus and EuroClaus (where EuroClaus is a process that includes an upstream hydrogenation of all sulfur components followed by the step of selective conversion of ¾S to S) . The Applicant has developed the POC catalyst (preferential oxidation catalyst) and the POC process used to treat ¾S containing off-gas from the viscose industry, where the specific POC catalyst does catalyze the ¾S to S reaction, but has a very low activity for the Claus reaction, which means that the reaction of ¾S to S is not reversed, even at the very high oxygen levels present in viscose off-gas. Furthermore, because the viscose off-gas contains particu late matter and due to the advantages of a high surface area and a low diffusion resistance, the POC catalyst is in monolithic form. The result is that plugging is avoided, and a high reaction rate and low formation of by-products can be achieved.
Applicant's WO 2018/065173 concerns a method for cleaning an off-gas from viscose production, essentially containing ¾S and CS2, in which the gas is passed through a catalytic reactor containing a direct oxidation type catalyst, such as V2O5 on silica, to convert ¾S in the gas to elemental sulfur, SO2 or mixtures thereof, either via the oxygen pre sent in the gas or via oxygen added to the gas stream. The elemental sulfur and SO2 are removed from the effluent gas from the catalytic reactor, and the unconverted CS2 is re cycled to the viscose production process.
In Applicant's US 9.364.789, a method for recovering hydro gen from ¾S and a method for purifying a gas stream con taining ¾S using supported silver catalysts are described. The problem solved by the present invention is the removal of ¾S to produce elemental sulfur. The standard solution in this respect is to use a Lo-Cat type technology for the enrichment of ¾S combined with a standard Claus process situated downstream. Applicant's WO 2018/138200 describes a method for selec tively converting ¾S to elemental sulfur, comprising
- passing a gas comprising O2, ¾, CO and ¾S through a re actor containing a catalyst active in selectively convert ing ¾S to S and ¾0,
- removing S from the converted gas by condensation, and
- hydrogenating by-products in the converted gas, such as SO2 and COS, back to ¾S and recycling said ¾S to the cata lyst-containing reactor. Similar processes are described in US 5.037.629, US 4.507.274, US 2003/0194366, US 4.988.494 and US 7.060.233. As regards other prior art, US 5.897.850 describes a pro cess for the recovery of sulfur from a hydrogen sulfide containing gas, comprising oxidizing the ¾S with O2 and reacting the resulting gas further in two or more catalytic stages. The ¾S concentration in the gas leaving the last catalytic stage is controlled to between 0.8 and 3 vol%, and then the gas is introduced into a heat exchanger having a wall temperature below the solidification point of sulfur and above the dew point of water, wherein the sulfur depos- its on the heat exchanger wall and is removed with the aid of gravity.
A POC catalyst system with dual pressure-drop sensors, es pecially for use in treating diesel engine exhaust, is de- scribed in US 2013/0327019, while catalysts and catalytic methods for selective oxidation of ¾S in a gas stream con taining one or more oxidizable components other than ¾S to generate SO2, elemental sulfur or both are described in WO 03/082455.
The Lo-Cat technology was developed to provide an isother mal, low operating cost method for carrying out a modified Claus reaction. It comprises a proprietary liquid Fe3+ re dox catalyst that converts ¾S to solid elemental sulfur by direct oxidation of ¾S (¾S + ½ O2 ¾0 + S) . This reac tion consists of five sequential steps: Absorption of ¾S, ionization of ¾S, catalytic oxidation of sulfide, absorp tion of oxygen and iron oxidation to get Fe2+ back to the Fe3+ state.
It has now been found that Applicant's POC catalyst is ca- pable of selectively converting ¾S to elemental S in a re ducing gas containing ¾ and CO (i.e. a syngas) by using the oxygen that is sometimes present in the gas and/or by adding oxygen. The sulfur can then be removed by condensa- tion or by using a liquid contactor. This is very attrac tive in the application of the POC catalyst to remove sul fur from coke oven gas and synthesis gas from coal gasifi cation, biomass gasification and waste gasification. Applicant's POC monolith catalyst is a monolithic catalyst where a silica carrier is embedded in the walls of a corru gated monolith made from a fiberglass sheet matrix. The silica carrier is impregnated with an iron catalyst, op tionally in combination with zinc oxide. The catalyst se- lectively oxidizes the ¾S, which is present in a syngas, into elemental sulfur. The by-products are SO2 and carbonyl sulfide (COS) . A higher degree of recovery can be accom plished if the COS and SO2 are hydrogenated back to ¾S and then led to the selective ¾S oxidation catalyst for a sec- ond conversion of ¾S to S. However, this would likely re quire that the sulfur is taken out in a liquid contactor between the two reaction steps and re-heated for the hydro genation reaction step. So the present invention relates to a method for selec tively converting hydrogen sulfide (¾S) to elemental sul fur (S) in a reducing gas containing ¾ and CO, comprising the steps of
- passing the gas through a catalytic reactor containing a catalyst that selectively converts ¾S in the gas to ele mental sulfur, either via the oxygen present in the gas or via oxygen added to the gas stream,
- removing the elemental sulfur from the effluent gas from the catalytic reactor by condensation or by contact with a liquid contactor, and optionally - hydrogenating the by-products SO2 and COS back to ¾S and feeding this ¾S to the catalytic reactor for another con version to elemental sulfur.
The catalyst to be used in the method is preferably a mono lithic catalyst comprising a silica carrier impregnated with an iron catalyst and embedded in the walls of a corru gated monolith made from a fiberglass matrix.
Preferably the catalyst is a monolithic catalyst comprising a silica carrier impregnated with an iron catalyst and em bedded in the walls of a corrugated monolith made from a fiberglass matrix.
The iron catalyst can advantageously be combined with zinc oxide .
In a preferred catalyst according to the invention, the iron compound is combined with zinc oxide. It is preferred that the iron compound in the catalyst according to the in vention contains from 1 to 15 wt% iron.
Another way to mitigate the by-product issue would be to minimize the by-product formation through improving the catalyst selectivity. For any catalyst, it is important that the catalyst carrier is not active for the Claus reac tion. For this reason, silica is a suitable carrier, and cerium oxide and possibly zirconia may be candidates. The temperature operation window can also be adjusted in order to maximize the yield of elemental S. There are several candidates for improving the selectivity compared to the Fe/Zn oxide catalyst on silica (POC catalyst) . Cr and Fe/Cr catalysts may work, but chromium is a challenging component to work with from an EHS (Environment, Health and Safety) perspective. Mn and Cu, and combinations thereof, are in teresting candidates, and vanadium oxide is another inter esting candidate, where the lower oxides V2O3 and VO2 pro- mote the selective oxidation of ¾S to S. But again, these catalysts must be supported on a carrier that is not active in the Claus reaction.
The effects and advantages of the invention are as follows:
The invention presents a more simple and effective way to remove sulfur from coke oven gas and syngas from coal gasi fication, biomass gasification and waste gasification. The method is suitable for low and medium high sulfur contents. The technology is low in CAPEX and has a low OPEX due to the fact that no additional chemicals are needed to remove the sulfur compounds.
The technology can be combined with ¾S sorbent technology and further combined with hydrogenation of any slip of sul fur components.

Claims

Claims :
1. A method for selectively converting hydrogen sul fide (¾S) to elemental sulfur (S) in a reducing gas con- taining ¾ and CO, comprising the steps of
- passing the gas through a catalytic reactor containing a catalyst that selectively converts ¾S in the gas to ele mental sulfur, either via the oxygen present in the gas or via oxygen added to the gas stream, - removing the elemental sulfur from the effluent gas from the catalytic reactor by condensation or by contact with a liquid contactor, and optionally
- hydrogenating the by-products SO2 and COS back to ¾S and feeding this ¾S to the catalytic reactor for another con- version to elemental sulfur.
2. A catalyst for use in the method according to claim 1, which is a monolithic catalyst comprising a silica carrier impregnated with a material that is catalytically active in oxidizing ¾S to S and embedded in the walls of a corru gated monolith.
3. Catalyst according to claim 2, which is an iron cata lyst.
4. Catalyst according to claim 3, wherein the iron compound is combined with zinc oxide.
5. Catalyst according to claim 2, wherein the corru gated monolith is made from a fiberglass matrix.
6. Catalyst according to any of the claims 3-5, wherein the iron compound contains 1 to 15 wt% iron.
PCT/EP2020/067102 2019-06-20 2020-06-19 Method and catalyst for selective oxidation of hydrogen sulfide to elemental sulfur in a reducing gas WO2020254578A1 (en)

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Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4507274A (en) 1982-03-11 1985-03-26 Basf Aktiengesellschaft Desulfurization of H2 S-containing gases
US4988494A (en) 1986-04-16 1991-01-29 Veg-Gasinstituut N.V. Process for recovering sulfur from sulfur-containing gases
EP0422999A1 (en) * 1989-10-09 1991-04-17 Rhone-Poulenc Chimie Catalysts for treating exhaust gases and process for treating these exhaust gases
US5037629A (en) 1986-04-16 1991-08-06 Veg-Gasinstituut N.V. Process for the selective oxidation of gaseous sulfur-containing compounds, hydrogen sulfide in particular, to form elemental sulfur
US5897850A (en) 1993-11-30 1999-04-27 Comprimo B.V. Process for removing elemental sulfur from a gas stream
WO2003082455A2 (en) 2002-03-25 2003-10-09 Tda Research, Inc. Catalysts and process for oxidizing hydrogen sulfide to sulfur dioxide and sulfur
US7060233B1 (en) 2002-03-25 2006-06-13 Tda Research, Inc. Process for the simultaneous removal of sulfur and mercury
US20130327019A1 (en) 2012-06-08 2013-12-12 Southwest Research Institute Particulate Oxidation Catalyst With Dual Pressure-Drop Sensors
US9364789B2 (en) 2012-08-21 2016-06-14 Haldor Topsoe A/S Method for recovering hydrogen from hydrogen sulfide
WO2018065173A1 (en) 2016-10-06 2018-04-12 Haldor Topsøe A/S A method for cleaning viscose production off-gases and catalysts for use in the method
WO2018138200A1 (en) 2017-01-25 2018-08-02 Haldor Topsøe A/S A process for treating the off gas from a carbon black plant to recover sulphur

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4507274A (en) 1982-03-11 1985-03-26 Basf Aktiengesellschaft Desulfurization of H2 S-containing gases
US4988494A (en) 1986-04-16 1991-01-29 Veg-Gasinstituut N.V. Process for recovering sulfur from sulfur-containing gases
US5037629A (en) 1986-04-16 1991-08-06 Veg-Gasinstituut N.V. Process for the selective oxidation of gaseous sulfur-containing compounds, hydrogen sulfide in particular, to form elemental sulfur
EP0422999A1 (en) * 1989-10-09 1991-04-17 Rhone-Poulenc Chimie Catalysts for treating exhaust gases and process for treating these exhaust gases
US5897850A (en) 1993-11-30 1999-04-27 Comprimo B.V. Process for removing elemental sulfur from a gas stream
WO2003082455A2 (en) 2002-03-25 2003-10-09 Tda Research, Inc. Catalysts and process for oxidizing hydrogen sulfide to sulfur dioxide and sulfur
US20030194366A1 (en) 2002-03-25 2003-10-16 Girish Srinivas Catalysts and process for oxidizing hydrogen sulfide to sulfur dioxide and sulfur
US7060233B1 (en) 2002-03-25 2006-06-13 Tda Research, Inc. Process for the simultaneous removal of sulfur and mercury
US20130327019A1 (en) 2012-06-08 2013-12-12 Southwest Research Institute Particulate Oxidation Catalyst With Dual Pressure-Drop Sensors
US9364789B2 (en) 2012-08-21 2016-06-14 Haldor Topsoe A/S Method for recovering hydrogen from hydrogen sulfide
WO2018065173A1 (en) 2016-10-06 2018-04-12 Haldor Topsøe A/S A method for cleaning viscose production off-gases and catalysts for use in the method
WO2018138200A1 (en) 2017-01-25 2018-08-02 Haldor Topsøe A/S A process for treating the off gas from a carbon black plant to recover sulphur

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