IT1097569B - Procedimento di sintesi della zeolite zsm-11 - Google Patents
Procedimento di sintesi della zeolite zsm-11Info
- Publication number
- IT1097569B IT1097569B IT26376/78A IT2637678A IT1097569B IT 1097569 B IT1097569 B IT 1097569B IT 26376/78 A IT26376/78 A IT 26376/78A IT 2637678 A IT2637678 A IT 2637678A IT 1097569 B IT1097569 B IT 1097569B
- Authority
- IT
- Italy
- Prior art keywords
- synthesis procedure
- zeolite zsm
- zsm
- zeolite
- synthesis
- Prior art date
Links
- 230000015572 biosynthetic process Effects 0.000 title 1
- 238000000034 method Methods 0.000 title 1
- 238000003786 synthesis reaction Methods 0.000 title 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C6/00—Preparation of hydrocarbons from hydrocarbons containing a different number of carbon atoms by redistribution reactions
- C07C6/08—Preparation of hydrocarbons from hydrocarbons containing a different number of carbon atoms by redistribution reactions by conversion at a saturated carbon-to-carbon bond
- C07C6/12—Preparation of hydrocarbons from hydrocarbons containing a different number of carbon atoms by redistribution reactions by conversion at a saturated carbon-to-carbon bond of exclusively hydrocarbons containing a six-membered aromatic ring
- C07C6/126—Preparation of hydrocarbons from hydrocarbons containing a different number of carbon atoms by redistribution reactions by conversion at a saturated carbon-to-carbon bond of exclusively hydrocarbons containing a six-membered aromatic ring of more than one hydrocarbon
-
- 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
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
- C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
- C01B39/36—Pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11
- C01B39/365—Type ZSM-8; Type ZSM-11; ZSM 5/11 intermediate
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2/00—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms
- C07C2/02—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by addition between unsaturated hydrocarbons
- C07C2/04—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by addition between unsaturated hydrocarbons by oligomerisation of well-defined unsaturated hydrocarbons without ring formation
- C07C2/06—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by addition between unsaturated hydrocarbons by oligomerisation of well-defined unsaturated hydrocarbons without ring formation of alkenes, i.e. acyclic hydrocarbons having only one carbon-to-carbon double bond
- C07C2/08—Catalytic processes
- C07C2/12—Catalytic processes with crystalline alumino-silicates or with catalysts comprising molecular sieves
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2/00—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms
- C07C2/54—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by addition of unsaturated hydrocarbons to saturated hydrocarbons or to hydrocarbons containing a six-membered aromatic ring with no unsaturation outside the aromatic ring
- C07C2/64—Addition to a carbon atom of a six-membered aromatic ring
- C07C2/66—Catalytic processes
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2/00—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms
- C07C2/86—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by condensation between a hydrocarbon and a non-hydrocarbon
- C07C2/862—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by condensation between a hydrocarbon and a non-hydrocarbon the non-hydrocarbon contains only oxygen as hetero-atoms
- C07C2/864—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by condensation between a hydrocarbon and a non-hydrocarbon the non-hydrocarbon contains only oxygen as hetero-atoms the non-hydrocarbon is an alcohol
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C5/00—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
- C07C5/22—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by isomerisation
- C07C5/2206—Catalytic processes not covered by C07C5/23 - C07C5/31
- C07C5/222—Catalytic processes not covered by C07C5/23 - C07C5/31 with crystalline alumino-silicates, e.g. molecular sieves
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C5/00—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
- C07C5/22—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by isomerisation
- C07C5/27—Rearrangement of carbon atoms in the hydrocarbon skeleton
- C07C5/2702—Catalytic processes not covered by C07C5/2732 - C07C5/31; Catalytic processes covered by both C07C5/2732 and C07C5/277 simultaneously
- C07C5/2708—Catalytic processes not covered by C07C5/2732 - C07C5/31; Catalytic processes covered by both C07C5/2732 and C07C5/277 simultaneously with crystalline alumino-silicates, e.g. molecular sieves
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C5/00—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
- C07C5/32—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with formation of free hydrogen
- C07C5/373—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with formation of free hydrogen with simultaneous isomerisation
- C07C5/393—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with formation of free hydrogen with simultaneous isomerisation with cyclisation to an aromatic six-membered ring, e.g. dehydrogenation of n-hexane to benzene
- C07C5/41—Catalytic processes
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C6/00—Preparation of hydrocarbons from hydrocarbons containing a different number of carbon atoms by redistribution reactions
- C07C6/08—Preparation of hydrocarbons from hydrocarbons containing a different number of carbon atoms by redistribution reactions by conversion at a saturated carbon-to-carbon bond
- C07C6/12—Preparation of hydrocarbons from hydrocarbons containing a different number of carbon atoms by redistribution reactions by conversion at a saturated carbon-to-carbon bond of exclusively hydrocarbons containing a six-membered aromatic ring
- C07C6/123—Preparation of hydrocarbons from hydrocarbons containing a different number of carbon atoms by redistribution reactions by conversion at a saturated carbon-to-carbon bond of exclusively hydrocarbons containing a six-membered aromatic ring of only one hydrocarbon
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2529/00—Catalysts comprising molecular sieves
- C07C2529/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites, pillared clays
- C07C2529/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S423/00—Chemistry of inorganic compounds
- Y10S423/29—MEL, e.g. ZSM-11
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Materials Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/820,992 US4108881A (en) | 1977-08-01 | 1977-08-01 | Synthesis of zeolite ZSM-11 |
Publications (2)
Publication Number | Publication Date |
---|---|
IT7826376A0 IT7826376A0 (it) | 1978-08-01 |
IT1097569B true IT1097569B (it) | 1985-08-31 |
Family
ID=25232222
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT26376/78A IT1097569B (it) | 1977-08-01 | 1978-08-01 | Procedimento di sintesi della zeolite zsm-11 |
Country Status (9)
Country | Link |
---|---|
US (1) | US4108881A (en, 2012) |
EP (1) | EP0000669B1 (en, 2012) |
JP (1) | JPS5452699A (en, 2012) |
AU (1) | AU515825B2 (en, 2012) |
CA (1) | CA1119146A (en, 2012) |
DE (1) | DE2860140D1 (en, 2012) |
IT (1) | IT1097569B (en, 2012) |
NZ (1) | NZ188025A (en, 2012) |
ZA (1) | ZA784360B (en, 2012) |
Families Citing this family (52)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2830787B2 (de) * | 1978-07-13 | 1981-02-19 | Basf Ag, 6700 Ludwigshafen | Verfahren zur Herstellung von stickstoffhaltigen kirstallinen Metallsilikaten mit Zeolithstniktur |
BR8000226A (pt) * | 1979-01-15 | 1980-10-07 | Mobil Oil Corp | Zeolito zsm-11, processo para sua preparacao, e processo para conversao de uma carga organica |
NZ192909A (en) * | 1979-02-21 | 1982-03-30 | Mobil Oil Corp | Crystalline zeolite designated zsm-48 useful as organic conversion catalyst |
DE2909929A1 (de) * | 1979-03-14 | 1980-09-25 | Basf Ag | Verfahren zur herstellung eines zeolithen vom strukturtyp zsm-5 |
US4229424A (en) * | 1979-04-09 | 1980-10-21 | Mobil Oil Corporation | Crystalline zeolite product constituting ZSM-5/ZSM-11 intermediates |
US4423021A (en) * | 1979-08-08 | 1983-12-27 | Mobil Oil Corporation | Method of preparing silico-crystal ZSM-48 |
US4259306A (en) * | 1979-10-15 | 1981-03-31 | Mobile Oil Corporation | Synthesis of ZSM-39 |
DE3061930D1 (en) * | 1979-12-31 | 1983-03-17 | Mobil Oil Corp | Conversion of olefin containing mixtures to gasoline |
DE3006471A1 (de) * | 1980-02-21 | 1981-08-27 | Basf Ag, 6700 Ludwigshafen | Kristalline isotaktische zeolithe, verfahren zur herstellung derselben sowie deren verwendung als katalysatoren |
CA1167071A (en) * | 1980-03-15 | 1984-05-08 | William J. Ball | Process for the production of aromatic hydrocarbons |
US4324940A (en) * | 1980-04-09 | 1982-04-13 | Mobil Oil Corporation | Shape selective acid catalyzed reactions of olefins over crystalline zeolites |
NZ197291A (en) * | 1980-06-12 | 1984-10-19 | Ici Ltd | Zeolite eu-2,useful in catalytic processes,especially convversion of methanol to hydrocarbons |
EP0042226B1 (en) * | 1980-06-12 | 1984-08-08 | Imperial Chemical Industries Plc | Zeolite eu-1 |
JPS577820A (en) * | 1980-06-18 | 1982-01-16 | Mitsubishi Heavy Ind Ltd | Novel crystalline silicate and its manufacture |
DE3031557C2 (de) * | 1980-08-21 | 1986-05-22 | Basf Ag, 6700 Ludwigshafen | Kristalliner Borsilikatzeolith ZBM-30 und Verfahren zu seiner Herstellung |
US4371457A (en) * | 1980-10-29 | 1983-02-01 | Mobil Oil Corporation | Zeolites modified with group VA metals |
DE3172377D1 (en) * | 1980-12-12 | 1985-10-24 | Exxon Research Engineering Co | Composite zeolite |
DE3268503D1 (en) * | 1981-05-20 | 1986-02-27 | Ici Plc | Zeolites |
CA1185953A (en) * | 1981-06-30 | 1985-04-23 | Muin S. Haddad | Method for manufacture of ams-1b crystalline borosilicate molecular sieve |
NZ202099A (en) * | 1981-10-21 | 1986-07-11 | Ici Plc | Preparation of zeolite nu-10 |
JPS58219130A (ja) * | 1982-06-14 | 1983-12-20 | シエブロン・リサ−チ・コンパニ− | ベンゼンの合成法 |
US4495166A (en) * | 1982-07-19 | 1985-01-22 | Mobil Oil Corporation | Synthesis of ZSM-5 utilizing a mixture of quaternary ammonium ions and amines |
US4481173A (en) * | 1982-11-22 | 1984-11-06 | Mobil Oil Corporation | Manufacture of low sodium zeolite |
DE3361440D1 (en) * | 1982-12-30 | 1986-01-16 | Asahi Chemical Ind | A crystalline aluminosilicate, a process for producing the same, and a catalyst comprising the crystalline aluminosilicate |
US4732747A (en) * | 1983-04-11 | 1988-03-22 | The Dow Chemical Company | Magnesium silicate compositions and process for making |
JPH0739357B2 (ja) * | 1983-10-28 | 1995-05-01 | 三菱化学株式会社 | ジメチルナフタレン類の異性化方法 |
GB2167052B (en) * | 1984-11-17 | 1988-09-07 | Laporte Industries Ltd | Synthetic crystalline molecular sieve materials and a method for their preparation |
US4894212A (en) * | 1987-07-20 | 1990-01-16 | Mobil Oil Corp. | Synthesis of crystalline silicate ZSM-11 |
US4797267A (en) * | 1987-12-23 | 1989-01-10 | Mobil Oil Corporation | Method of producing rod-shaped ZSM-5 zeolite |
US5213786A (en) * | 1991-12-20 | 1993-05-25 | Mobil Oil Corp. | Synthesis of crystalline silicate ZSM-11 |
DE4323774A1 (de) * | 1993-07-15 | 1995-02-09 | Basf Ag | Hohlkugelartig agglomerierte Pentasilzeolithe |
AU7963594A (en) * | 1993-10-01 | 1995-05-01 | Chevron U.S.A. Inc. | Zeolite zsm-11 and a process for preparing zeolite zsm-11 using a 3,5-dimethylpiperidinium templating agent |
US5840264A (en) * | 1994-08-22 | 1998-11-24 | Board Of Trustees Operating Michigan State University | Crystalline inorganic oxide compositions prepared by neutral templating route |
US6162414A (en) | 1994-08-22 | 2000-12-19 | Board Of Trustees Operating Michigan State University | Quasi crystalline inorganic oxide compositions prepared by neutral templating route |
US5785946A (en) * | 1994-08-22 | 1998-07-28 | Board Of Trustees Operating Michigan State University | Crystalline inorganic oxide compositions prepared by neutral templating route |
CN1041399C (zh) * | 1994-12-30 | 1998-12-30 | 中国石油化工总公司 | 一种含稀土的结晶硅酸铝沸石 |
US5622684A (en) * | 1995-06-06 | 1997-04-22 | Board Of Trustees Operating Michigan State University | Porous inorganic oxide materials prepared by non-ionic surfactant templating route |
US5800799A (en) * | 1996-05-02 | 1998-09-01 | Board Of Trustees Operating Michigan State University | Porous inorganic oxide materials prepared by non-ionic surfactant and fluoride ion |
CN1048655C (zh) * | 1996-06-24 | 2000-01-26 | 中国石油化工总公司 | 一种烷基化催化剂及其应用 |
US6027706A (en) * | 1998-05-05 | 2000-02-22 | Board Of Trustees Operating Michigan State University | Porous aluminum oxide materials prepared by non-ionic surfactant assembly route |
US6277355B1 (en) | 1999-07-13 | 2001-08-21 | Exxonmobil Chemical Patents Inc. | Synthesis of ZSM-5 and ZSM-11 |
US6649083B1 (en) | 1999-08-12 | 2003-11-18 | Board Of Trustees Of Michigan State University | Combined porous organic and inorganic oxide materials prepared by non-ionic surfactant templating route |
DE19955557A1 (de) * | 1999-11-18 | 2001-05-23 | Basf Ag | Oxidischer Katalysator mit Zeolithstruktur und Verfahren zu dessen Herstellung |
FR2914635B1 (fr) | 2007-04-05 | 2009-11-20 | Inst Francais Du Petrole | Procede de preparation d'une zeolithe de type structural mel |
RU2346930C1 (ru) * | 2007-11-08 | 2009-02-20 | Государственное образовательное учреждение высшего профессионального образования "Российский химико-технологический университет им. Д.И. Менделеева" (РХТУ им. Д.И. Менделеева) | Способ получения мононитротолуола с повышенным содержанием п-изомера |
CN106673001B (zh) * | 2015-11-09 | 2018-11-20 | 中国石油化工股份有限公司 | Zsm-11分子筛的合成方法及其合成的zsm-11分子筛 |
CN106672999B (zh) * | 2015-11-09 | 2018-10-23 | 中国石油化工股份有限公司 | 含卤素和稀土金属的zsm-11/zsm-5复合分子筛的合成方法及其合成的复合分子筛 |
CN106673002B (zh) * | 2015-11-09 | 2018-11-20 | 中国石油化工股份有限公司 | Zsm-11/zsm-5复合分子筛的合成方法及其合成的复合分子筛 |
CN106673000B (zh) * | 2015-11-09 | 2018-10-23 | 中国石油化工股份有限公司 | 含稀土金属的zsm-11分子筛的合成方法及其合成的分子筛 |
CN106944080B (zh) * | 2016-01-07 | 2018-11-06 | 中国石油化工股份有限公司 | 一种用于乙烷氧化脱氢制乙烯催化剂的制备方法 |
US20220134318A1 (en) | 2019-03-29 | 2022-05-05 | Exxonmobil Chemical Patents Inc. | Mel-Type Zeolite for Converting Aromatic Hydrocarbons, Process for Making and Catalytic Composition Comprising Said Zeolite |
US12060320B2 (en) | 2019-03-29 | 2024-08-13 | ExxonMobil Engineering & Technology Company | Zeolite, process for making same, and use thereof in converting aromatic hydrocarbons |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3853743A (en) * | 1970-04-09 | 1974-12-10 | Mobil Oil | Removal of organic cations from crystalline aluminosilicates |
US3709979A (en) * | 1970-04-23 | 1973-01-09 | Mobil Oil Corp | Crystalline zeolite zsm-11 |
US3804746A (en) * | 1970-04-23 | 1974-04-16 | Mobil Oil Corp | Hydrocarbon conversion using crystalline zeolite zsm-11 catalyst |
US4016245A (en) * | 1973-09-04 | 1977-04-05 | Mobil Oil Corporation | Crystalline zeolite and method of preparing same |
US3947482A (en) * | 1974-03-20 | 1976-03-30 | W. R. Grace & Co. | Method for producing open framework zeolites |
ZA756744B (en) * | 1974-10-30 | 1976-10-27 | Ici Ltd | Improvements in and relating to zeolites |
US4046859A (en) * | 1974-11-29 | 1977-09-06 | Mobil Oil Corporation | Crystalline zeolite and method of preparing same |
US4021447A (en) * | 1975-04-30 | 1977-05-03 | Mobil Oil Corporation | Synthesis of zeolite ZSM-4 |
US4025571A (en) * | 1976-05-12 | 1977-05-24 | Mobil Oil Corporation | Manufacture of hydrocarbons |
US4139600A (en) * | 1977-04-22 | 1979-02-13 | Mobil Oil Corporation | Synthesis of zeolite ZSM-5 |
-
1977
- 1977-08-01 US US05/820,992 patent/US4108881A/en not_active Expired - Lifetime
-
1978
- 1978-07-28 CA CA000308325A patent/CA1119146A/en not_active Expired
- 1978-07-31 AU AU38489/78A patent/AU515825B2/en not_active Expired
- 1978-08-01 IT IT26376/78A patent/IT1097569B/it active
- 1978-08-01 EP EP78300219A patent/EP0000669B1/en not_active Expired
- 1978-08-01 NZ NZ188025A patent/NZ188025A/xx unknown
- 1978-08-01 JP JP9321778A patent/JPS5452699A/ja active Granted
- 1978-08-01 ZA ZA784360A patent/ZA784360B/xx unknown
- 1978-08-01 DE DE7878300219T patent/DE2860140D1/de not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5452699A (en) | 1979-04-25 |
JPS6215488B2 (en, 2012) | 1987-04-08 |
DE2860140D1 (en) | 1980-12-11 |
IT7826376A0 (it) | 1978-08-01 |
EP0000669A1 (en) | 1979-02-07 |
AU515825B2 (en) | 1981-04-30 |
CA1119146A (en) | 1982-03-02 |
EP0000669B1 (en) | 1980-09-03 |
NZ188025A (en) | 1980-11-28 |
AU3848978A (en) | 1980-02-07 |
US4108881A (en) | 1978-08-22 |
ZA784360B (en) | 1980-03-26 |
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