FR2295782A1 - Procede d'epuration d'un gaz contenant du sulfure d'hydrogene et masses de contact utilisables a cet effet - Google Patents

Procede d'epuration d'un gaz contenant du sulfure d'hydrogene et masses de contact utilisables a cet effet

Info

Publication number
FR2295782A1
FR2295782A1 FR7443202A FR7443202A FR2295782A1 FR 2295782 A1 FR2295782 A1 FR 2295782A1 FR 7443202 A FR7443202 A FR 7443202A FR 7443202 A FR7443202 A FR 7443202A FR 2295782 A1 FR2295782 A1 FR 2295782A1
Authority
FR
France
Prior art keywords
depuring
gas containing
hydrogen sulfide
containing hydrogen
contact masses
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR7443202A
Other languages
English (en)
Other versions
FR2295782B1 (fr
Inventor
Philippe Courty
Andre Deschamps
Sigismond Franckowiak
Andre Sugier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IFP Energies Nouvelles IFPEN
Original Assignee
IFP Energies Nouvelles IFPEN
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by IFP Energies Nouvelles IFPEN filed Critical IFP Energies Nouvelles IFPEN
Priority to FR7443202A priority Critical patent/FR2295782A1/fr
Priority to US05/641,352 priority patent/US4088736A/en
Priority to GB52123/75A priority patent/GB1522519A/en
Priority to BE1007091A priority patent/BE836838A/fr
Priority to IT30660/75A priority patent/IT1051869B/it
Priority to NL7515103A priority patent/NL7515103A/xx
Priority to JP50159705A priority patent/JPS5189890A/ja
Priority to DE19752558905 priority patent/DE2558905A1/de
Publication of FR2295782A1 publication Critical patent/FR2295782A1/fr
Application granted granted Critical
Publication of FR2295782B1 publication Critical patent/FR2295782B1/fr
Granted legal-status Critical Current

Links

Classifications

    • 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
    • B01D53/52—Hydrogen sulfide
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
    • C01B3/50—Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification
    • C01B3/56—Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification by contacting with solids; Regeneration of used solids
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
    • C01B2203/04—Integrated processes for the production of hydrogen or synthesis gas containing a purification step for the hydrogen or the synthesis gas
    • C01B2203/042—Purification by adsorption on solids
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
    • C01B2203/04—Integrated processes for the production of hydrogen or synthesis gas containing a purification step for the hydrogen or the synthesis gas
    • C01B2203/0465—Composition of the impurity
    • C01B2203/0485—Composition of the impurity the impurity being a sulfur compound
FR7443202A 1974-12-27 1974-12-27 Procede d'epuration d'un gaz contenant du sulfure d'hydrogene et masses de contact utilisables a cet effet Granted FR2295782A1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
FR7443202A FR2295782A1 (fr) 1974-12-27 1974-12-27 Procede d'epuration d'un gaz contenant du sulfure d'hydrogene et masses de contact utilisables a cet effet
US05/641,352 US4088736A (en) 1974-12-27 1975-12-16 Process for purifying a gas containing hydrogen sulfide and contact masses usable therefor
BE1007091A BE836838A (fr) 1974-12-27 1975-12-19 Procede d'epuration d'un gaz contenant du sulfure d'hydrogene et masses de contact utilisables a cet effet
GB52123/75A GB1522519A (en) 1974-12-27 1975-12-19 Removing sulphur compounds from gases containing them
IT30660/75A IT1051869B (it) 1974-12-27 1975-12-23 Procedimento di depurazione di un gas contenente idrogeno solforato e masse di contatto utilizzabili a questo scopo
NL7515103A NL7515103A (nl) 1974-12-27 1975-12-24 Werkwijze voor het zuiveren van een zwavelwater- stof bevattend gas en voor dit doel bruikbare kontaktmassa.
JP50159705A JPS5189890A (fr) 1974-12-27 1975-12-25
DE19752558905 DE2558905A1 (de) 1974-12-27 1975-12-27 Verfahren zur reinigung eines schwefelwasserstoffhaltigen gases und dafuer verwendbare kontaktmassen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7443202A FR2295782A1 (fr) 1974-12-27 1974-12-27 Procede d'epuration d'un gaz contenant du sulfure d'hydrogene et masses de contact utilisables a cet effet

Publications (2)

Publication Number Publication Date
FR2295782A1 true FR2295782A1 (fr) 1976-07-23
FR2295782B1 FR2295782B1 (fr) 1980-03-28

Family

ID=9146726

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7443202A Granted FR2295782A1 (fr) 1974-12-27 1974-12-27 Procede d'epuration d'un gaz contenant du sulfure d'hydrogene et masses de contact utilisables a cet effet

Country Status (8)

Country Link
US (1) US4088736A (fr)
JP (1) JPS5189890A (fr)
BE (1) BE836838A (fr)
DE (1) DE2558905A1 (fr)
FR (1) FR2295782A1 (fr)
GB (1) GB1522519A (fr)
IT (1) IT1051869B (fr)
NL (1) NL7515103A (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0071983A2 (fr) * 1981-08-07 1983-02-16 Veg-Gasinstituut N.V. Procédé pour éliminer des composés de soufre contenus dans des gaz
EP0242920A1 (fr) * 1986-04-16 1987-10-28 Veg-Gasinstituut N.V. Catalyseur pour l'oxydation sélective de composants contenant du soufre, en particulier le sulfure d'hydrogène, en soufre élémentaire, procédé pour la préparation du catalyseur et procédé pour l'oxydation sélective de composants contenant du soufre, en particulier le sulfure d'hydrogène, en soufre élémentaire
EP0401789A1 (fr) * 1989-06-07 1990-12-12 Phillips Petroleum Company Enlèvement sélectif de sulfure d'hydrogène par une composition absorbante contenant de l'oxyde de zinc et de la diatomite
EP0568003A2 (fr) * 1992-04-28 1993-11-03 Phillips Petroleum Company Absorption d'hydrogène sulfuré et composition absorbante utilisée à cette fin
EP0401788B1 (fr) * 1989-06-07 1993-11-18 Phillips Petroleum Company Enlèvement sélectif de sulfure d'hydrogène par une composition absorbante contenant un promoteur de nickel
WO1993023159A1 (fr) * 1992-05-11 1993-11-25 Molecular Products Limited Procede de purification
EP0670179A2 (fr) * 1994-03-04 1995-09-06 Phillips Petroleum Company Sorbant de soufre fluidisable et procédé de sorption en lit fluide
EP0469513B1 (fr) * 1990-07-30 1997-05-02 Phillips Petroleum Company Enrobage d'absorbants de composés soufrés
US5914292A (en) * 1994-03-04 1999-06-22 Phillips Petroleum Company Transport desulfurization process utilizing a sulfur sorbent that is both fluidizable and circulatable and a method of making such sulfur sorbent

Families Citing this family (85)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2456543A1 (fr) * 1979-05-15 1980-12-12 Inst Francais Du Petrole Procede d'epuration d'un gaz contenant du sulfure d'hydrogene
US4263020A (en) * 1980-01-02 1981-04-21 Exxon Research & Engineering Co. Removal of sulfur from process streams
US4419968A (en) * 1980-02-28 1983-12-13 Phillips Petroleum Company Method and apparatus for removing hydrogen sulfide from fuel for an internal combustion engine
US4347811A (en) * 1980-02-28 1982-09-07 Phillips Petroleum Company Method and apparatus for removing hydrogen sulfide from fuel for an internal combustion engine
US4271133A (en) * 1980-03-31 1981-06-02 Union Carbide Corporation Process for removing hydrogen cyanide from gaseous streams
US4299802A (en) * 1980-03-31 1981-11-10 Union Carbide Corporation Process for removing carbonyl sulfide from gaseous streams
US4363790A (en) * 1981-08-14 1982-12-14 Institute Of Gas Technology Desulfurization of H2 S containing gas streams with production of elemental sulfur
US4556547A (en) * 1982-02-01 1985-12-03 Takeda Chemical Industries, Ltd. Process for treatment of gases
DE3228481A1 (de) * 1982-07-30 1984-02-02 VEG-Gasinstituut N.V., 7300 Apeldoorn Reaktionsmasse, verfahren zu ihrer herstellung und deren verwendung
US4550098A (en) * 1982-11-12 1985-10-29 The Boc Group, Inc. Methods for the removal of gaseous impurities from mixed gas streams
DE3243206A1 (de) * 1982-11-23 1984-05-24 Basf Ag, 6700 Ludwigshafen Verfahren zur reinigung von co und/oder co(pfeil abwaerts)2(pfeil abwaerts) enthaltenden gasen
SU1214583A1 (ru) * 1983-05-26 1986-02-28 Азербайджанский Институт Нефти И Химии Им.М.Азизбекова Способ очистки газа от сероводорода
US4793976A (en) * 1983-10-21 1988-12-27 Amoco Corporation Sulfur recovery system
US4913637A (en) * 1983-10-21 1990-04-03 Amoco Corporation Sulfur recovery system
US4533529A (en) * 1983-10-21 1985-08-06 Standard Oil Company Sulfur recovery process
DE3341712A1 (de) * 1983-11-18 1985-05-30 Drägerwerk AG, 2400 Lübeck Luftreinigungsmittel zur verwendung in luftfiltern
GB8407842D0 (en) * 1984-03-27 1984-05-02 Shell Int Research Removing hydrogen sulphide from gases
US4553986A (en) * 1984-11-13 1985-11-19 Westinghouse Electric Corp. Filtering system and method of using same
US4599161A (en) * 1984-11-30 1986-07-08 Phillips Petroleum Company Retorting process with contaminant removal
GB8517333D0 (en) * 1985-07-09 1985-08-14 Ici Plc Purification of hydrocarbon mixture
US4740361A (en) * 1986-03-27 1988-04-26 Union Carbide Corporation Process for removing metal carbonyls from gaseous streams
US4732888A (en) * 1986-05-15 1988-03-22 Amax Inc. Durable zinc ferrite sorbent pellets for hot coal gas desulfurization
US4954331A (en) * 1986-08-04 1990-09-04 Amoco Corporation Sulfur recovery process using metal oxide absorbent
US4849202A (en) * 1986-08-04 1989-07-18 Amoco Corporation Sulfur recovery process using metal oxide absorbent with reducing gas purge
US5108739A (en) * 1986-08-25 1992-04-28 Titan Kogyo Kabushiki Kaisha White colored deodorizer and process for producing the same
GB8630846D0 (en) * 1986-12-24 1987-02-04 Ici Plc Desulphurisation
US5110586A (en) * 1987-04-02 1992-05-05 Titan Kogyo Kabushiki Kaisha White colored deodorizer and process for producing the same
US5026528A (en) * 1987-06-04 1991-06-25 General Electric Environmental Services, Inc. System for removal or sulfur compounds from gases and for regenerating spent sorbents
US4857285A (en) * 1987-06-04 1989-08-15 General Electric Environmental Services, Inc. Method and system for removal of sulfur compounds from gases and for regenerating spent sorbents
US5110568A (en) * 1987-09-01 1992-05-05 Exxon Research And Engineering Company Stannosilicates and preparation thereof
US4830733A (en) * 1987-10-05 1989-05-16 Uop Integrated process for the removal of sulfur compounds from fluid streams
US5114689A (en) * 1987-10-05 1992-05-19 Uop Integrated process for the removal of sulfur compounds from fluid streams
US4797268A (en) * 1987-11-30 1989-01-10 Amoco Corporation Sulfur recovery process using metal oxide absorbent with regenerator recycle to Claus catalytic reactor
US4842843A (en) * 1987-12-17 1989-06-27 Amoco Corporation Removal of water vapor diluent after regeneration of metal oxide absorbent to reduce recycle stream
US5100659A (en) * 1988-07-22 1992-03-31 Titan Kogyo Kabushiki Kaisha White colored deodorizer and process for producing the same
JPH0817906B2 (ja) * 1989-01-05 1996-02-28 三菱重工業株式会社 高温還元性ガスの精製プロセスにおけるイオウ回収方法
US5248489A (en) * 1989-06-07 1993-09-28 Phillips Petroleum Company Selective removal of hydrogen sulfide over a zinc oxide and silica absorbing composition
US5157201A (en) * 1990-06-22 1992-10-20 Exxon Chemical Patents Inc. Process for adsorbing sulfur species from propylene/propane using regenerable adsorbent
US5118480A (en) * 1990-06-25 1992-06-02 General Electric Environmental Services, Incorporated Method for removing hcl and hf from coal derived fuel gas
US5069685A (en) * 1990-08-03 1991-12-03 The United States Of America As Represented By The United States Department Of Energy Two-stage coal gasification and desulfurization apparatus
US5151401A (en) * 1990-11-19 1992-09-29 Phillips Petroleum Company Preparation of dehydrogenating catalyst
US5130288A (en) * 1991-03-07 1992-07-14 Phillips Petroleum Company Cogelled mixtures of hydrated zinc oxide and hydrated silica sulfur sorbents
US5174919A (en) * 1991-03-07 1992-12-29 Phillips Petroleum Company Sulfur absorbents and process for removing sulfur from fluid streams
US5102854A (en) * 1991-03-08 1992-04-07 Phillips Petroleum Company Adsorbent compositions for the removal of hydrogen sulfide from fluid streams
US5178843A (en) * 1991-03-08 1993-01-12 Phillips Petroleum Company Removal of hydrogen sulfide from fluid streams
US5370848A (en) * 1991-06-20 1994-12-06 Phillips Petroleum Company Sulfur absorbents
US5401475A (en) * 1991-07-08 1995-03-28 G.E. Environmental Services, Inc. Process and apparatus for generating elemental sulfur and re-usable metal oxide from spent metal sulfide sorbents
US5219542A (en) * 1991-07-10 1993-06-15 Phillips Petroleum Company Process for removing sulfur compounds
ZA93401B (en) * 1992-01-27 1993-08-24 Phillips Petroleum Co Composition useful as sulfur absorption for fluid streams.
US5220091A (en) * 1992-02-26 1993-06-15 Phillips Petroleum Company Alkane dehydrogenation
US5348921A (en) * 1993-06-14 1994-09-20 The United States Of America As Represented By The United States Department Of Energy Method for reducing sulfate formation during regeneration of hot-gas desulfurization sorbents
US5538703A (en) * 1993-10-29 1996-07-23 Massachusetts Institute Of Technology Hot gas desulfurization by injection of regenerable sorbents in gasifier-exit ducts
US5866503A (en) * 1994-03-23 1999-02-02 The United States Of America As Represented By The United States Department Of Energy Durable regenerable sorbent pellets for removal of hydrogen sulfide coal gas
US5494880A (en) * 1994-03-23 1996-02-27 The United States Of America As Represented By The United States Department Of Energy Durable zinc oxide-containing sorbents for coal gas desulfurization
US5891415A (en) * 1995-05-17 1999-04-06 Azerbaidzhanskaya Gosudarstvennaya Neftianaya Academiya Process for selective oxidation of hydrogen sulfide to elemental sulfur
US5603913A (en) * 1995-05-17 1997-02-18 Azerbaidzhanskaya Gosudarstvennaya Neftianaya Academiya Catalysts and process for selective oxidation of hydrogen sulfide to elemental sulfur
US5710089A (en) * 1995-06-07 1998-01-20 Phillips Petroleum Company Sorbent compositions
US5726117A (en) * 1995-06-07 1998-03-10 Phillips Petroleum Company Sorbent compositions containing zinc subjected to a steam treatment
US5972835A (en) * 1995-09-13 1999-10-26 Research Triangle Institute Fluidizable particulate materials and methods of making same
US5710083A (en) * 1996-08-14 1998-01-20 Phillips Petroleum Company Process to rejuvenate spent zinc oxide sorbents
JP3781871B2 (ja) * 1997-07-22 2006-05-31 ズードケミー触媒株式会社 塩化物吸収剤
US5914288A (en) 1997-09-29 1999-06-22 Research Triangle Institute Metal sulfide initiators for metal oxide sorbent regeneration
US6812189B1 (en) * 1998-02-24 2004-11-02 Research Triangle Institute Attrition resistant, zinc titanate-containing, reduced sulfur sorbents
CA2333061C (fr) * 1998-02-24 2008-02-05 Albert A. Vierheilig Sorbants de gaz a teneur en soufre reduite, resistants a l'usure et contenant du titanate de zinc
US6254766B1 (en) * 1999-08-25 2001-07-03 Phillips Petroleum Company Desulfurization and novel sorbents for same
US6271173B1 (en) * 1999-11-01 2001-08-07 Phillips Petroleum Company Process for producing a desulfurization sorbent
AU2001288327A1 (en) * 2000-09-11 2002-03-26 Research Triangle Institute Process for desulfurizing hydrocarbon fuels and fuel components
US20030181314A1 (en) * 2001-08-31 2003-09-25 Texaco Inc. Using shifted syngas to regenerate SCR type catalyst
US6649555B2 (en) 2001-12-19 2003-11-18 Conocophillips Company Reactivation of deactivated sorbents
US6544410B1 (en) 2001-12-19 2003-04-08 Phillips Petroleum Company Desulfurization with improved sorbent regeneration
US6635795B2 (en) 2001-12-19 2003-10-21 Conocophillips Company Desulfurization with improved sorbent regeneration
US7618606B2 (en) * 2003-02-06 2009-11-17 The Ohio State University Separation of carbon dioxide (CO2) from gas mixtures
US6951635B2 (en) * 2003-09-26 2005-10-04 Research Triangle Institute Zinc oxide-based sorbents and processes for preparing and using same
US7427385B2 (en) * 2004-12-17 2008-09-23 Exxonmobil Research And Engineering Company Systems and processes for reducing the sulfur content of hydrocarbon streams
CN101119796B (zh) * 2005-01-06 2010-11-17 研究三角协会 氧化锌基吸附剂及其制备和使用方法
US7678351B2 (en) * 2005-03-17 2010-03-16 The Ohio State University High temperature CO2 capture using engineered eggshells: a route to carbon management
CN101374759A (zh) * 2006-01-18 2009-02-25 国际壳牌研究有限公司 从合成气物流中除去硫化羰和硫化氢的方法
CA2664674C (fr) * 2006-09-25 2014-09-23 The Ohio State University Production d'hydrogene haute pression haute purete avec capture sur place de co2 et de soufre dans un reacteur a une seule etape
US7964114B2 (en) * 2007-12-17 2011-06-21 Sud-Chemie Inc. Iron-based water gas shift catalyst
US7682424B2 (en) * 2008-01-31 2010-03-23 Conocophillips Company Contaminant removal from a gas stream
RU2517639C2 (ru) 2008-12-31 2014-05-27 Чайна Петролеум & Кемикал Корпорейшн Адсорбент, способ его получения и способ удаления серы из крекинг-бензина или дизельного топлива
US8268745B2 (en) * 2009-01-08 2012-09-18 China Petroleum & Chemical Corporation Silicate-resistant desulfurization sorbent
FR2940967B1 (fr) * 2009-01-12 2012-07-20 Inst Francais Du Petrole Preparation d'un solide a base d'oxyde de zinc utilisable pour la purification d'un gaz ou d'un liquide
FR3051459B1 (fr) * 2016-05-20 2021-03-19 Centre Nat Rech Scient Installation et procede de traitement d'un flux comprenant du sulfure d'hydrogene
EP3914375A4 (fr) * 2019-01-28 2022-11-02 Susteon Inc. Processus de désulfuration en continu basé sur des sorbants régénérables à base d'oxyde métallique

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US2442982A (en) * 1946-03-19 1948-06-08 Atlantic Refining Co Desulfurization of hydrocarbons
US3441370A (en) * 1966-04-25 1969-04-29 Catalysts & Chem Inc Method of removing sulfur compounds from gases
GB1452279A (en) * 1973-02-27 1976-10-13 Ici Ltd Fluids purification

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0071983A2 (fr) * 1981-08-07 1983-02-16 Veg-Gasinstituut N.V. Procédé pour éliminer des composés de soufre contenus dans des gaz
EP0071983A3 (en) * 1981-08-07 1983-05-18 Veg-Gasinstituut N.V. Process for removing sulfur compounds from gases
EP0242920A1 (fr) * 1986-04-16 1987-10-28 Veg-Gasinstituut N.V. Catalyseur pour l'oxydation sélective de composants contenant du soufre, en particulier le sulfure d'hydrogène, en soufre élémentaire, procédé pour la préparation du catalyseur et procédé pour l'oxydation sélective de composants contenant du soufre, en particulier le sulfure d'hydrogène, en soufre élémentaire
EP0401789A1 (fr) * 1989-06-07 1990-12-12 Phillips Petroleum Company Enlèvement sélectif de sulfure d'hydrogène par une composition absorbante contenant de l'oxyde de zinc et de la diatomite
EP0401788B1 (fr) * 1989-06-07 1993-11-18 Phillips Petroleum Company Enlèvement sélectif de sulfure d'hydrogène par une composition absorbante contenant un promoteur de nickel
EP0469513B1 (fr) * 1990-07-30 1997-05-02 Phillips Petroleum Company Enrobage d'absorbants de composés soufrés
EP0568003A2 (fr) * 1992-04-28 1993-11-03 Phillips Petroleum Company Absorption d'hydrogène sulfuré et composition absorbante utilisée à cette fin
EP0568003A3 (en) * 1992-04-28 1993-12-29 Phillips Petroleum Co Absorption of hydrogen sulfide and absorbent composition therefor
WO1993023159A1 (fr) * 1992-05-11 1993-11-25 Molecular Products Limited Procede de purification
EP0670179A2 (fr) * 1994-03-04 1995-09-06 Phillips Petroleum Company Sorbant de soufre fluidisable et procédé de sorption en lit fluide
EP0670179A3 (fr) * 1994-03-04 1995-11-22 Phillips Petroleum Co Sorbant de soufre fluidisable et procédé de sorption en lit fluide.
US5914292A (en) * 1994-03-04 1999-06-22 Phillips Petroleum Company Transport desulfurization process utilizing a sulfur sorbent that is both fluidizable and circulatable and a method of making such sulfur sorbent

Also Published As

Publication number Publication date
NL7515103A (nl) 1976-06-29
IT1051869B (it) 1981-05-20
BE836838A (fr) 1976-06-21
GB1522519A (en) 1978-08-23
DE2558905A1 (de) 1976-07-08
JPS5189890A (fr) 1976-08-06
US4088736A (en) 1978-05-09
FR2295782B1 (fr) 1980-03-28

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