MX163582B - Metodo para la elaboracion de perlas esfericas de alumina - Google Patents
Metodo para la elaboracion de perlas esfericas de aluminaInfo
- Publication number
- MX163582B MX163582B MX190765A MX19076582A MX163582B MX 163582 B MX163582 B MX 163582B MX 190765 A MX190765 A MX 190765A MX 19076582 A MX19076582 A MX 19076582A MX 163582 B MX163582 B MX 163582B
- Authority
- MX
- Mexico
- Prior art keywords
- pearls
- elaboration
- spherical alumina
- alumina
- spherical
- Prior art date
Links
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title 1
- 239000011049 pearl Substances 0.000 title 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/02—Boron or aluminium; Oxides or hydroxides thereof
- B01J21/04—Alumina
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/85—Chromium, molybdenum or tungsten
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
-
- 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
- C10G45/06—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 nickel or cobalt metal, or compounds thereof
- C10G45/08—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 nickel or cobalt metal, or compounds thereof in combination with chromium, molybdenum, or tungsten metals, or compounds thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/61—Surface area
- B01J35/615—100-500 m2/g
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/63—Pore volume
- B01J35/635—0.5-1.0 ml/g
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/64—Pore diameter
- B01J35/647—2-50 nm
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
- C01P2004/32—Spheres
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/10—Solid density
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/14—Pore volume
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/16—Pore diameter
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/22—Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Catalysts (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US20977680A | 1980-12-24 | 1980-12-24 | |
| US06/325,699 US4411771A (en) | 1980-12-24 | 1981-11-30 | Process for hydrotreating heavy hydrocarbons and catalyst used in said process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| MX163582B true MX163582B (es) | 1992-06-03 |
Family
ID=26904498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| MX190765A MX163582B (es) | 1980-12-24 | 1982-01-04 | Metodo para la elaboracion de perlas esfericas de alumina |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4411771A (es) |
| EP (1) | EP0054976B1 (es) |
| AU (1) | AU535847B2 (es) |
| BR (1) | BR8108392A (es) |
| CA (1) | CA1173817A (es) |
| DE (1) | DE3175051D1 (es) |
| MX (1) | MX163582B (es) |
Families Citing this family (51)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2528721B1 (fr) * | 1982-06-17 | 1986-02-28 | Pro Catalyse Ste Fse Prod Cata | Catalyseur supporte presentant une resistance accrue aux poisons et son utilisation en particulier pour l'hydrotraitement de fractions petrolieres contenant des metaux |
| US4534855A (en) * | 1983-01-03 | 1985-08-13 | Tenneco Oil Company | Shale oil demetallization process |
| EP0121735A1 (en) * | 1983-03-16 | 1984-10-17 | American Cyanamid Company | Reforming catalysts having support prepared from rehydratable alumina |
| WO1985001225A1 (fr) * | 1983-09-22 | 1985-03-28 | Catalysts & Chemicals Industries Co., Ltd. | Procede de preparation d'une composition de catalyseur destinee a etre utilisee dans le craquage d'hydrocarbures |
| EP0145341A3 (en) * | 1983-11-18 | 1987-08-26 | Aluminum Company Of America | Method for making alumina objects |
| US4579839A (en) * | 1983-11-18 | 1986-04-01 | Aluminum Company Of America | Rehydration bondable alumina |
| JPS60193543A (ja) * | 1984-03-15 | 1985-10-02 | Shokubai Kasei Kogyo Kk | 炭化水素接触分解用触媒組成物の製造法 |
| WO1992002456A1 (en) * | 1985-03-18 | 1992-02-20 | Aluminum Company Of America | Alumina suitable for catalytic applications |
| IT1186728B (it) * | 1985-06-04 | 1987-12-16 | Montedison Spa | Ossidi misti di allumina e zirconia sotto forma di particelle sferiche ed aventi distribuzione granulometrica ristretta e processo per la loro preparazione |
| US4816139A (en) * | 1986-06-27 | 1989-03-28 | Tenneco Oil Company | Method for removing sulfur compounds from C6 and lower alkanes |
| US4828683A (en) * | 1987-02-06 | 1989-05-09 | Phillips Petroleum Company | Hydrofining employing a support material for fixed beds |
| US4895816A (en) * | 1987-02-06 | 1990-01-23 | Gardner Lloyd E | Support material containing catalyst for fixed hydrofining beds |
| US4767523A (en) * | 1987-03-11 | 1988-08-30 | Phillips Petroleum Company | Treated alumina material for fixed hydrofining beds |
| US4820676A (en) * | 1987-03-11 | 1989-04-11 | Phillips Petroleum Company | Treated alumina material for fixed hydrofining beds and process for its preparation |
| US4802974A (en) * | 1987-03-12 | 1989-02-07 | Phillips Petroleum Company | Hydrofining employing treated alumina material in fixed beds |
| US4870044A (en) * | 1987-03-12 | 1989-09-26 | Phillips Petroleum Company | Treated alumina material for fixed hydrofining beds |
| US4729980A (en) * | 1987-04-27 | 1988-03-08 | Intevep, S.A. | Catalyst for the simultaneous hydrodemetallization and hydroconversion of heavy hydrocarbon feedstocks and process for preparing the catalyst |
| US4824556A (en) * | 1987-05-20 | 1989-04-25 | Phillips Petroleum Company | Hydrogenation process of unsaturated hydrocarbons employing impregnated alumina containing material |
| US4778587A (en) * | 1987-05-20 | 1988-10-18 | Phillips Petroleum Company | Hydrotreating process employing a pretreated alumina containing material |
| US4778588A (en) * | 1987-05-20 | 1988-10-18 | Phillips Petroleum Company | Hydrotreating process employing an impregnated alumina containing material |
| US4814315A (en) * | 1987-05-20 | 1989-03-21 | Phillips Petroleum Company | Pretreated alumina containing material and process for its preparation |
| US4831004A (en) * | 1987-05-20 | 1989-05-16 | Phillips Petroleum Company | Impregnated alumina-containing material |
| US5498327A (en) * | 1989-07-19 | 1996-03-12 | Stangeland; Bruce E. | Catalyst, method and apparatus for an on-stream particle replacement system for countercurrent contact of a gas and liquid feed stream with a packed bed |
| US5472928A (en) * | 1989-07-19 | 1995-12-05 | Scheuerman; Georgieanna L. | Catalyst, method and apparatus for an on-stream particle replacement system for countercurrent contact of a gas and liquid feed stream with a packed bed |
| US5492617A (en) * | 1989-07-19 | 1996-02-20 | Trimble; Harold J. | Apparatus and method for quenching in hydroprocessing of a hydrocarbon feed stream |
| US5916529A (en) * | 1989-07-19 | 1999-06-29 | Chevron U.S.A. Inc | Multistage moving-bed hydroprocessing reactor with separate catalyst addition and withdrawal systems for each stage, and method for hydroprocessing a hydrocarbon feed stream |
| US5589057A (en) * | 1989-07-19 | 1996-12-31 | Chevron U.S.A. Inc. | Method for extending the life of hydroprocessing catalyst |
| WO1991004943A2 (en) * | 1989-09-29 | 1991-04-18 | Exxon Research And Engineering Company | Zeolite aggregates and catalysts |
| IS3896A (is) * | 1991-08-07 | 1993-02-08 | Comalco Aluminium Limited | Hreinsun á loftkenndum flúoríðum úr útblæstri iðjuvera |
| US5885534A (en) * | 1996-03-18 | 1999-03-23 | Chevron U.S.A. Inc. | Gas pocket distributor for hydroprocessing a hydrocarbon feed stream |
| US5879642A (en) * | 1996-04-24 | 1999-03-09 | Chevron U.S.A. Inc. | Fixed bed reactor assembly having a guard catalyst bed |
| JP4266406B2 (ja) * | 1998-05-11 | 2009-05-20 | 日本ケッチェン株式会社 | 粒状触媒用担体及びこの担体を用いた触媒及び該触媒による炭化水素油の水素化処理方法 |
| DE10119233A1 (de) * | 2001-04-19 | 2002-11-07 | Sued Chemie Ag | Verfahren zur Herstellung von Hydrotalcit-Vorläufern bzw. von Hydrotalciten |
| FR2867988B1 (fr) * | 2004-03-23 | 2007-06-22 | Inst Francais Du Petrole | Catalyseur supporte dope de forme spherique et procede d'hydrotraitement et d'hydroconversion de fractions petrolieres contenant des metaux |
| US8153180B2 (en) * | 2005-09-06 | 2012-04-10 | Pepsico, Inc. | Method and apparatus for making beverages |
| DE102007011471B4 (de) * | 2006-03-09 | 2021-09-30 | Shell Internationale Research Maatschappij B.V. | Katalysatorkombination für die hydrierende Verarbeitung von Vakuumgasölen und/oder Visbreakergasölen |
| WO2008141423A1 (en) | 2007-05-21 | 2008-11-27 | Exploration Orbite Vspa Inc. | Processes for extracting aluminum and iron from aluminous ores |
| BR112013023907A2 (pt) | 2011-03-18 | 2019-09-24 | Orbite Aluminae Inc | processo de recuperação de ao menos um elemento terra-rara a partir de um material contendo alumínio |
| EP3141621A1 (en) | 2011-05-04 | 2017-03-15 | Orbite Aluminae Inc. | Processes for recovering rare earth elements from various ores |
| US9150428B2 (en) | 2011-06-03 | 2015-10-06 | Orbite Aluminae Inc. | Methods for separating iron ions from aluminum ions |
| EP2726578B1 (en) * | 2011-06-28 | 2020-04-29 | Shell International Research Maatschappij B.V. | An ether amine additive impregnated composition useful in the catalytic hydroprocessing of hydrocarbons, a method of making such composition |
| AU2012308068B2 (en) | 2011-09-16 | 2015-02-05 | Aem Technologies Inc. | Processes for preparing alumina and various other products |
| CN104302791B (zh) | 2012-01-10 | 2017-03-15 | 奥佰特氧化铝有限公司 | 用于处理赤泥的方法 |
| US9181603B2 (en) | 2012-03-29 | 2015-11-10 | Orbite Technologies Inc. | Processes for treating fly ashes |
| MY175471A (en) | 2012-07-12 | 2020-06-29 | Orbite Tech Inc | Processes for preparing titanium oxide and various other products |
| MX345342B (es) * | 2012-08-20 | 2017-01-24 | Inst Mexicano Del Petróleo | Procedimiento para el mejoramiento de crudos pesados y extrapesados. |
| JP2015535886A (ja) | 2012-09-26 | 2015-12-17 | オーバイト アルミナ インコーポレイテッドOrbite Aluminae Inc. | 種々の材料のHCl浸出によるアルミナおよび塩化マグネシウムを調製するためのプロセス |
| CA2891427C (en) | 2012-11-14 | 2016-09-20 | Orbite Aluminae Inc. | Methods for purifying aluminium ions |
| US11091396B2 (en) * | 2016-05-23 | 2021-08-17 | Sasol (Usa) Corporation | High strength shaped aluminas and a method of producing such high strength shaped aluminas |
| CN110201691B (zh) * | 2019-06-25 | 2022-05-06 | 中化泉州石化有限公司 | 一种渣油加氢脱金属脱硫催化剂及其制备方法 |
| JP2025513598A (ja) | 2022-04-25 | 2025-04-24 | ビーエーエスエフ コーポレーション | 粒状アルミナの調製方法 |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2492167A (en) * | 1943-06-01 | 1949-12-27 | Socony Vacuum Oil Co Inc | Process of forming alumina-containing gel beads |
| US2448460A (en) * | 1944-03-07 | 1948-08-31 | Standard Oil Dev Co | Process of producing an inorganic hydrogel |
| FR939752A (fr) * | 1946-01-16 | 1948-11-24 | Bataafsche Petroleum | Préparation de particules en forme de larmes |
| US3519574A (en) * | 1964-02-14 | 1970-07-07 | American Cyanamid Co | Process for manufacture of catalyst material and catalyst material produced thereby |
| GB1119589A (en) * | 1965-12-13 | 1968-07-10 | Engelhard Min & Chem | Improvements in or relating to aluminum oxide gels |
| DE1592098C3 (de) * | 1965-12-13 | 1978-05-11 | Engelhard Minerals & Chemicals Corp., Murray Hill, N.J. (V.St.A.) | Verfahren zur Herstellung von kugelförmigen Aluminiumoxidteilchen |
| FR2223306B1 (es) * | 1973-03-27 | 1975-08-22 | Rhone Progil | |
| US3923646A (en) * | 1973-04-03 | 1975-12-02 | Universal Oil Prod Co | Hydrodesulfurization with a catalyst formed from an alumina sol containing alpha-alumina monohydrate |
| US4069139A (en) * | 1975-12-29 | 1978-01-17 | Exxon Research & Engineering Co. | Hydrodesulfurization of oil utilizing a narrow pore size distribution catalyst |
| US4016106A (en) * | 1976-01-05 | 1977-04-05 | Exxon Research And Engineering Company | Preparation of catalysts of predetermined pore size distribution and pore volume |
| US4120826A (en) * | 1976-06-14 | 1978-10-17 | American Cyanamid Company | Hydrodesulfurization catalysts based on supports prepared from rehydratable alumina |
| US4038177A (en) * | 1976-07-19 | 1977-07-26 | Exxon Research And Engineering Company | Oil hydrodesulfurization with alumina composite catalyst utilizing aluminate and dicarboxylic acid in its preparation |
| US4065407A (en) * | 1976-09-16 | 1977-12-27 | American Cyanamid Company | Process for preparing shaped particles from rehydratable alumina |
| US4169874A (en) * | 1976-09-16 | 1979-10-02 | American Cyanamid Company | Process for preparing shaped particles from rehydratable alumina |
| US4119531A (en) * | 1977-06-30 | 1978-10-10 | Standard Oil Company (Indiana) | Large-pore hydrodemetallization catalyst and process employing same |
| CA1127791A (en) * | 1978-05-19 | 1982-07-13 | Robert L. Albright | Method of suspension polymerization and apparatus therefor |
-
1981
- 1981-11-30 US US06/325,699 patent/US4411771A/en not_active Expired - Lifetime
- 1981-12-17 CA CA000392511A patent/CA1173817A/en not_active Expired
- 1981-12-23 EP EP81110756A patent/EP0054976B1/en not_active Expired
- 1981-12-23 DE DE8181110756T patent/DE3175051D1/de not_active Expired
- 1981-12-23 BR BR8108392A patent/BR8108392A/pt unknown
- 1981-12-23 AU AU78845/81A patent/AU535847B2/en not_active Expired
-
1982
- 1982-01-04 MX MX190765A patent/MX163582B/es unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE3175051D1 (en) | 1986-09-04 |
| AU535847B2 (en) | 1984-04-05 |
| EP0054976A1 (en) | 1982-06-30 |
| AU7884581A (en) | 1982-07-01 |
| US4411771A (en) | 1983-10-25 |
| BR8108392A (pt) | 1982-10-13 |
| EP0054976B1 (en) | 1986-07-30 |
| CA1173817A (en) | 1984-09-04 |
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