ES2148297T3 - Procedimiento para la produccion conjunta de destilados medios y de aceites lubricantes a partir de fracciones petroleras pesadas. - Google Patents
Procedimiento para la produccion conjunta de destilados medios y de aceites lubricantes a partir de fracciones petroleras pesadas.Info
- Publication number
- ES2148297T3 ES2148297T3 ES94402284T ES94402284T ES2148297T3 ES 2148297 T3 ES2148297 T3 ES 2148297T3 ES 94402284 T ES94402284 T ES 94402284T ES 94402284 T ES94402284 T ES 94402284T ES 2148297 T3 ES2148297 T3 ES 2148297T3
- Authority
- ES
- Spain
- Prior art keywords
- comprised
- stage
- joint production
- procedure
- heavy oil
- 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.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G69/00—Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one other conversion process
- C10G69/02—Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one other conversion process plural serial stages only
- C10G69/04—Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one other conversion process plural serial stages only including at least one step of catalytic cracking in the absence of hydrogen
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G65/00—Treatment of hydrocarbon oils by two or more hydrotreatment processes only
- C10G65/02—Treatment of hydrocarbon oils by two or more hydrotreatment processes only plural serial stages only
- C10G65/12—Treatment of hydrocarbon oils by two or more hydrotreatment processes only plural serial stages only including cracking steps and other hydrotreatment steps
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G45/00—Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds
- C10G45/02—Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds to eliminate hetero atoms without changing the skeleton of the hydrocarbon involved and without cracking into lower boiling hydrocarbons; Hydrofinishing
- C10G45/04—Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds to eliminate hetero atoms without changing the skeleton of the hydrocarbon involved and without cracking into lower boiling hydrocarbons; Hydrofinishing characterised by the catalyst used
- C10G45/10—Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds to eliminate hetero atoms without changing the skeleton of the hydrocarbon involved and without cracking into lower boiling hydrocarbons; Hydrofinishing characterised by the catalyst used containing platinum group metals or compounds thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Catalysts (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
LA INVENCION SE REFIERE A UN PROCESO DE PRODUCCION CONJUNTA DE DESTILADOS MEDIOS Y DE BASES DE ACEITES (INDICE DE VISCOSIDAD COMPRENDIDO ENTRE 95 Y 150) A PARTIR PARTICULARMENTE DE DESTILADOS EN VACIO Y/O DE ACEITES DESASFALTADOS. EL PROCESO COMPRENDE UNA PRIMERA ETAPA EN LA QUE LA CARGA SE PONE EN CONTACTO CON UN CATALIZADOR AMORFO CARGADO CON AL MENOS UN METAL O COMPUESTO QUE TIENE UNA FUNCION HIDRODESHIDROGENADOA, TAL COMO NI, MO, W, CO, A UNA VELOCIDAD COMPRENDIDA ENTRE 350 Y 450 (GRADOS) C, UNA PRESION COMPRENDIDA ENTRE 5 Y 20 MPA, UNA VELOCIDAD ESPACIAL COMPRENDIDA ENTRE 0,1 Y 5 H-1 Y EN PRESENCIA DE HIDROGENO EN UNA RELACION VOLUMINICA (H2/HC = 150 A 2.000, EL PRODUCTO OBTENIDO DE LA PRIMERA ETAPA SE PONE EN CONTACTO, EN UNA SEGUNDA ETAPA, CON UN SEGUNDO CATALIZADOR QUE COMPRENDE UN SOPORTE, UNA ZEOLITA Y, AL MENOS UN ELEMENTO DEL GRUPO VIB Y AL MENOS UN METAL DEL GRUPO VIII A UNA TEMPERATURA COMPRENDIDA ENTRE 350 Y 430 (GRADOS) C, UNA PRESION COMPRENDIDA ENTRE 5 Y 20 MPA Y UNA VELOCIDAD COMPRENDIDA ENTRE 0,1 Y 5H-1.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9312856A FR2711667B1 (fr) | 1993-10-25 | 1993-10-25 | Procédé pour la production améliorée de distillats moyens conjointement à la production d'huiles ayant des indices de viscosité et des viscosités élevés, à partir de coupes pétrolières lourdes. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES2148297T3 true ES2148297T3 (es) | 2000-10-16 |
Family
ID=9452297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES94402284T Expired - Lifetime ES2148297T3 (es) | 1993-10-25 | 1994-10-11 | Procedimiento para la produccion conjunta de destilados medios y de aceites lubricantes a partir de fracciones petroleras pesadas. |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US5525209A (es) |
| EP (1) | EP0649896B1 (es) |
| JP (1) | JP3564581B2 (es) |
| KR (1) | KR100309488B1 (es) |
| CA (1) | CA2134281C (es) |
| DE (1) | DE69424247T2 (es) |
| ES (1) | ES2148297T3 (es) |
| FR (1) | FR2711667B1 (es) |
| RU (1) | RU2135549C1 (es) |
Families Citing this family (49)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6592748B2 (en) | 1996-06-28 | 2003-07-15 | Exxonmobil Research And Engineering Company | Reffinate hydroconversion process |
| US5976353A (en) * | 1996-06-28 | 1999-11-02 | Exxon Research And Engineering Co | Raffinate hydroconversion process (JHT-9601) |
| US5935416A (en) * | 1996-06-28 | 1999-08-10 | Exxon Research And Engineering Co. | Raffinate hydroconversion process |
| US6325918B1 (en) | 1996-06-28 | 2001-12-04 | Exxonmobile Research And Engineering Company | Raffinate hydroconversion process |
| US6096189A (en) * | 1996-12-17 | 2000-08-01 | Exxon Research And Engineering Co. | Hydroconversion process for making lubricating oil basestocks |
| US5935417A (en) * | 1996-12-17 | 1999-08-10 | Exxon Research And Engineering Co. | Hydroconversion process for making lubricating oil basestocks |
| US6974535B2 (en) | 1996-12-17 | 2005-12-13 | Exxonmobil Research And Engineering Company | Hydroconversion process for making lubricating oil basestockes |
| FR2777290B1 (fr) * | 1998-04-09 | 2000-05-12 | Inst Francais Du Petrole | Procede d'amelioration de l'indice de cetane d'une coupe gasoil |
| FR2778343B1 (fr) * | 1998-05-06 | 2000-06-16 | Inst Francais Du Petrole | Catalyseur a base de zeolithe y non globalement desaluminee, de bore et/ou de silicium et procede d'hydrocraquage |
| DE69910885T2 (de) * | 1998-05-06 | 2004-05-19 | Institut Français du Pétrole, Rueil-Malmaison | Katalysator auf Basis von Beta-Zeolith mit Promotorelement und Verfahren zum Hydrocracken |
| FR2778344B1 (fr) * | 1998-05-06 | 2000-06-16 | Inst Francais Du Petrole | Catalyseur a base de zeolithe beta et d'element promoteur et procede d'hydrocraquage |
| FR2778345B1 (fr) * | 1998-05-06 | 2000-11-24 | Inst Francais Du Petrole | Catalyseur a base de zeolithe y contenant du bore et/ou du silicium, utilisable en hydrocraquage |
| FR2778582B1 (fr) * | 1998-05-13 | 2000-06-16 | Inst Francais Du Petrole | Procede pour l'amelioration du point d'ecoulement et catalyseur a base d'au moins une zeolithe mtt, ton, fer |
| FR2780304B1 (fr) * | 1998-06-25 | 2000-07-28 | Inst Francais Du Petrole | Catalyseur sulfure et son utilisation |
| FR2797883B1 (fr) * | 1999-08-24 | 2004-12-17 | Inst Francais Du Petrole | Procede de production d'huiles ayant un indice de viscosite eleve |
| FR2808028B1 (fr) * | 2000-04-21 | 2003-09-05 | Inst Francais Du Petrole | Procede flexible de production de bases huiles avec une zeolithe zsm-48 |
| KR100830074B1 (ko) | 2000-12-19 | 2008-05-16 | 쉘 인터내셔날 리서치 마챠피즈 비.브이. | 스핀들유, 경질 기계유 및 중질 기계유의 제조 방법 |
| RU2220186C2 (ru) * | 2001-06-15 | 2003-12-27 | Открытое акционерное общество "Ангарский завод катализаторов и органического синтеза" | Способ гидрооблагораживания и каталитической депарафинизации компонентов минеральных масел и система катализаторов для его осуществления |
| FR2830870B1 (fr) * | 2001-10-15 | 2006-12-29 | Inst Francais Du Petrole | Procede d'hydrocraquage"une etape" de charges hydrocarbonees a fortes teneurs en azote |
| CA2509231A1 (en) * | 2002-12-09 | 2004-06-24 | Shell Internationale Research Maatschappij B.V. | Process to prepare a base oil having a viscosity index of between 80 and 140 |
| JP4938447B2 (ja) | 2003-06-23 | 2012-05-23 | シエル・インターナシヨネイル・リサーチ・マーチヤツピイ・ベー・ウイ | 潤滑基油の製造方法 |
| CN100358979C (zh) * | 2003-06-27 | 2008-01-02 | 国际壳牌研究有限公司 | 制备润滑基础油的方法 |
| EP1720961B1 (en) | 2004-03-02 | 2014-12-10 | Shell Internationale Research Maatschappij B.V. | Process to continuously prepare two or more base oil grades and middle distillates |
| EP1853682A1 (en) * | 2004-12-23 | 2007-11-14 | Shell Internationale Research Maatschappij B.V. | Process to prepare a lubricating base oil |
| RU2286846C1 (ru) * | 2005-07-04 | 2006-11-10 | Открытое акционерное общество "Ангарский завод катализаторов и органического синтеза" (ОАО АЗК и ОС) | Катализатор гидроочистки нефтяных фракций |
| RU2286847C1 (ru) * | 2005-07-04 | 2006-11-10 | Открытое акционерное общество "Ангарский завод катализаторов и органического синтеза" (ОАО АЗК и ОС) | Способ приготовления катализатора для гидроочистки нефтяных фракций |
| RU2298578C1 (ru) * | 2006-01-26 | 2007-05-10 | Общество с ограниченной ответственностью "Научно-производственное объединение "Нефтехимальянс" (ООО НПО "Нефтехимальянс") | Способ гидрогенизационной переработки тяжелого нефтяного сырья |
| RU2306978C1 (ru) * | 2006-03-24 | 2007-09-27 | Открытое акционерное общество "Ангарский завод катализаторов и органического синтеза" (ОАО АКЗиОС) | Катализатор гидроочистки нефтяных фракций и способ его приготовления |
| JP4769110B2 (ja) * | 2006-03-30 | 2011-09-07 | Jx日鉱日石エネルギー株式会社 | ワックスの水素化分解方法 |
| CA2697371C (en) * | 2007-08-27 | 2017-04-25 | Shell Internationale Research Maatschappij B.V. | An amorphous silica-alumina composition and a method of making and using such composition |
| CA2758285C (en) | 2009-04-21 | 2018-01-16 | Albemarle Europe Sprl | Hydrotreating catalyst containing phosphorus and boron |
| US8557106B2 (en) | 2010-09-30 | 2013-10-15 | Exxonmobil Research And Engineering Company | Hydrocracking process selective for improved distillate and improved lube yield and properties |
| CN103562352A (zh) | 2011-04-21 | 2014-02-05 | 国际壳牌研究有限公司 | 转化固体生物质材料的方法 |
| CN103562353B (zh) | 2011-04-21 | 2016-04-06 | 国际壳牌研究有限公司 | 液体燃料组合物 |
| EP2699643A1 (en) | 2011-04-21 | 2014-02-26 | Shell Internationale Research Maatschappij B.V. | Improvements to separation of product streams |
| EP2699646A1 (en) | 2011-04-21 | 2014-02-26 | Shell Internationale Research Maatschappij B.V. | Process for regenerating a coked catalytic cracking catalyst |
| AU2012245159A1 (en) | 2011-04-21 | 2013-10-31 | Shell Internationale Research Maatschappij B.V. | Process for converting a solid biomass material |
| BR112013027137A2 (pt) | 2011-04-21 | 2017-01-10 | Shell Int Research | processos para a conversão de um material de biomassa sólida, para a preparação de um componente de biocombustível e/ou componente bioquímico, e para a produção de um biocombustível e/ou produto bioquímico |
| JP2014515055A (ja) | 2011-04-21 | 2014-06-26 | シエル・インターナシヨネイル・リサーチ・マーチヤツピイ・ベー・ウイ | 固体バイオマス材料を転化させる方法 |
| BR112013027149A2 (pt) | 2011-04-21 | 2017-01-10 | Shell Int Research | processo para a conversão de um material de biomassa sólida |
| CA2833200A1 (en) | 2011-04-21 | 2012-10-26 | Shell Internationale Research Maatschappij B.V. | Process for preparing a suspension of solid biomass particles in a hydrocarbon-containing liquid and converting the suspension |
| EP2780433A1 (en) | 2011-11-14 | 2014-09-24 | Shell Internationale Research Maatschappij B.V. | Process for conversion of a cellulosic material |
| US20130167430A1 (en) | 2011-12-30 | 2013-07-04 | Shell Oil Company | Process for converting a solid biomass material |
| US20130178672A1 (en) | 2012-01-06 | 2013-07-11 | Shell Oil Company | Process for making a distillate product and/or c2-c4 olefins |
| WO2013160253A1 (en) | 2012-04-23 | 2013-10-31 | Shell Internationale Research Maatschappij B.V. | Process for converting a solid biomass material |
| SG11201504335RA (en) | 2012-12-19 | 2015-07-30 | Exxonmobil Res & Eng Co | Mesoporous zeolite -y hydrocracking catalyst and associated hydrocracking processes |
| FR3027913A1 (fr) | 2014-11-04 | 2016-05-06 | Ifp Energies Now | Procede de conversion de charges petrolieres comprenant une etape de viscoreduction, une etape de maturation et une etape de separation des sediments pour la production de fiouls a basse teneur en sediments |
| FR3036704B1 (fr) | 2015-06-01 | 2017-05-26 | Ifp Energies Now | Procede de conversion de charges comprenant une etape de viscoreduction, une etape de precipitation et une etape de separation des sediments pour la production de fiouls |
| RU2642446C1 (ru) * | 2017-03-17 | 2018-01-25 | Открытое акционерное общество "НОВОШАХТИНСКИЙ ЗАВОД НЕФТЕПРОДУКТОВ"(ОАО "НЗНП") | Способ получения смазывающего материала |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3385781A (en) * | 1965-04-01 | 1968-05-28 | Exxon Research Engineering Co | Hydrocracking process |
| PL72593B1 (es) * | 1968-02-14 | 1974-08-31 | ||
| NL166494C (nl) * | 1969-04-10 | 1981-08-17 | Standard Oil Co | Werkwijze voor het hydrokraken van een mengsel van petroleumkoolwaterstoffen, dat boven 180 graden c kookt en 1 tot 3000 mg/kg stikstof bevat. |
| CA938236A (en) * | 1970-01-26 | 1973-12-11 | P. Gallagher James | Preparation of lubricating oils of high viscosity and low aromatic content |
| DE3221076A1 (de) * | 1982-06-04 | 1983-12-08 | Basf Ag, 6700 Ludwigshafen | Verfahren zur herstellung von medizinischen weissoelen durch katalytische hydrierung und katalysatoren hierfuer |
| DE3366278D1 (en) * | 1982-08-09 | 1986-10-23 | Mobil Oil Corp | A process and catalyst composition for upgrading a hydrocarbon feedstock |
| US4689137A (en) * | 1984-08-24 | 1987-08-25 | Union Oil Company Of California | Hydrocracking catalyst of improved activity |
| EP0182216A3 (en) * | 1984-11-20 | 1988-02-03 | Union Oil Company Of California | Hydrocracking catalyst with reduced zeolite content |
| US4764266A (en) * | 1987-02-26 | 1988-08-16 | Mobil Oil Corporation | Integrated hydroprocessing scheme for production of premium quality distillates and lubricants |
| US4797195A (en) * | 1988-02-26 | 1989-01-10 | Amoco Corporation | Three zone hydrocracking process |
| US4940530A (en) * | 1989-02-21 | 1990-07-10 | Amoco Corporation | Two-stage hydrocarbon conversion process |
| US4875991A (en) * | 1989-03-27 | 1989-10-24 | Amoco Corporation | Two-catalyst hydrocracking process |
| US5198099A (en) * | 1991-08-12 | 1993-03-30 | Exxon Research And Engineering Company | Three-stage process for producing ultra-clean distillate products |
| RU2044031C1 (ru) * | 1992-10-15 | 1995-09-20 | Уфимский нефтеперерабатывающий завод | Способ получения экологически чистого дизельного топлива |
-
1993
- 1993-10-25 FR FR9312856A patent/FR2711667B1/fr not_active Expired - Lifetime
-
1994
- 1994-10-11 DE DE69424247T patent/DE69424247T2/de not_active Revoked
- 1994-10-11 EP EP94402284A patent/EP0649896B1/fr not_active Revoked
- 1994-10-11 ES ES94402284T patent/ES2148297T3/es not_active Expired - Lifetime
- 1994-10-24 RU RU94037956A patent/RU2135549C1/ru active
- 1994-10-24 KR KR1019940027109A patent/KR100309488B1/ko not_active Expired - Lifetime
- 1994-10-24 US US08/330,820 patent/US5525209A/en not_active Expired - Lifetime
- 1994-10-25 JP JP26010594A patent/JP3564581B2/ja not_active Expired - Lifetime
- 1994-10-25 CA CA002134281A patent/CA2134281C/fr not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2134281C (fr) | 2005-08-02 |
| EP0649896B1 (fr) | 2000-05-03 |
| JPH07179864A (ja) | 1995-07-18 |
| EP0649896A1 (fr) | 1995-04-26 |
| US5525209A (en) | 1996-06-11 |
| RU94037956A (ru) | 1996-09-10 |
| FR2711667B1 (fr) | 1996-02-02 |
| RU2135549C1 (ru) | 1999-08-27 |
| KR950011594A (ko) | 1995-05-15 |
| DE69424247T2 (de) | 2000-09-07 |
| FR2711667A1 (fr) | 1995-05-05 |
| KR100309488B1 (ko) | 2001-12-28 |
| JP3564581B2 (ja) | 2004-09-15 |
| DE69424247D1 (de) | 2000-06-08 |
| CA2134281A1 (fr) | 1995-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2134281A1 (fr) | Procede pour la production amelioree de distillats moyens conjointement a la production d'huiles ayant des indices de viscosite et des viscosites elevees, a partir de coupes petrolieres | |
| US3904513A (en) | Hydrofinishing of petroleum | |
| BR9407765A (pt) | Processo para converter um estoque de alimentação de hidrocarboneto contendo cera contendo uma proporção substancial de material hidro-carbonáceo que entra em ebulição acima de 343oC em um produto destilado médio que tem um teor de cera reduzido e produto | |
| ES8102180A1 (es) | Un procedimiento para desparafinar un aceite hidrocarbonado que hierve por encima de 177 grados c. | |
| MX171865B (es) | , "UN PROCEDIMIENTO PARA EL HIDROTRATAMIENTO DE UN ACEITE DE HIDROCARBURO PESADO QUE CONTIENE ASFALTENOS a Periódica; y uno o más componentes metálicos caty IB de la Tabla Periódica, dichos componentes met75 A o más: a) un diámetro promedio de poros de en | |
| ES2098065T5 (es) | Procedimiento para la preparacion de aceites bases lubricantes. | |
| CA2031492A1 (en) | Novel vi enhancing compositions and newtonian lube blends | |
| BR9710699A (pt) | Processo para a prepara-Æo de Äleos base lubrificantes | |
| EA200300973A1 (ru) | Способ получения смазочного масла и газойля | |
| SG147434A1 (en) | Lubricant base oils with optimized branching | |
| GB1443877A (en) | Catalytic dewaxing of gas oils | |
| MX172340B (es) | Procedimiento para la fabricacion de aceites de base lubricantes | |
| KR880002978A (ko) | 수첨 분해된 윤활유 기초원료를 탈납시키는 개량방법 | |
| ES2145827T3 (es) | Procedimiento para la produccion de aceite lubricante pesado de baja temperatura de descongelacion. | |
| KR840007895A (ko) | 에틸렌 알파올레핀 윤활제조성물 | |
| ES2011734A6 (es) | Procedimiento para preparar oliigomeros olefinicos que tienen propiedades lubricantes. | |
| GB1318150A (en) | Process for regenerating used lubricating oils | |
| NO963498D0 (no) | Oljesammensetninger | |
| ES2096129T3 (es) | Lubricantes para fluidos de compresor. | |
| GB1264981A (es) | ||
| CA2017634A1 (en) | Process for the manufacture of lubricating base oils | |
| AR034048A1 (es) | Proceso fischer-tropsch | |
| MX161159A (es) | Procedimiento para formar una composicion de oxidato de un petrolato o una cera de hidrocarburo | |
| ES2032004T3 (es) | Procedimiento de craqueo de aceites pesados. | |
| GB1421265A (en) | Process for preparing hydrogen sulphide |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FG2A | Definitive protection |
Ref document number: 649896 Country of ref document: ES |