Patents by Inventor Guy L. G. Debras
Guy L. G. Debras has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6541413Abstract: The present invention provides a process for preparing polyolefins having a multimodal or at least bimodal molecular weight distribution by contacting in a reaction mixture under polymeriation conditions at least one olefin and a catalyst system comprising a supported catalyst-component comprising an alumoxane and at least two metallocenes containing the same transition metal and selected from the group consisting of mono, di, and tri-cyclopentadienyls and substituted cyclopentadienyls of a transition metal and wherein at least one of the metallocenes is bridged and at least one of the metallocenes is unbridged.Type: GrantFiled: June 2, 1995Date of Patent: April 1, 2003Assignee: Fina Research, S.A.Inventors: Abbas Razavi, Guy L. G. Debras
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Patent number: 5719241Abstract: The present invention provides a process for preparing polyolefins having a multimodal or at least bimodal molecular weight distribution by contacting in a reaction mixture under polymerization conditions at least one olefin and a catalyst system comprising a supported catalyst-component comprising an alumoxane and at least two metallocenes containing the same transition metal and selected from mono, di, and tri-cyclopentadienyls and substituted cyclopentadienyls of a transition metal and wherein at least one of the metallocenes is bridged and at least one of the metallocenes is unbridged.Type: GrantFiled: April 7, 1994Date of Patent: February 17, 1998Assignee: Fina Research, S.A.Inventors: Abbas Razavi, Guy L.G. Debras
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Patent number: 5674379Abstract: The present invention relates to a process for removing carbonyl sulfide from a liquid hydrocarbon feedstock, said process comprising the steps of (a) passing said hydrocarbon feedstock over an absorbent material comprising nickel deposited on a support material wherein nickel is present as both nickel oxide and metallic nickel and wherein the absorbent material has been conditioned by passing an inert gas flow containing a minor amount of propylene; and (b) recovering a liquid hydrocarbon stream having substantially reduced carbonyl sulfide content.Type: GrantFiled: June 7, 1995Date of Patent: October 7, 1997Assignee: Fina Research, S.A.Inventors: Guy L. G. Debras, Georges E. M. J. De Clippeleir, Raymond M. Cahen
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Patent number: 5492984Abstract: The present invention provides new magnesium chloride-cyclic ether complexes having utility as a component of Ziegler-Natta catalysts for the polymerization of olefins.Type: GrantFiled: August 31, 1993Date of Patent: February 20, 1996Assignee: Fina Research, S.A.Inventors: Patrick Brems, Guy L. G. Debras
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Patent number: 5470456Abstract: The present invention relates to a process for removing carbonyl sulfide from a liquid hydrocarbon feedstock, said process comprising the steps of (a) passing said hydrocarbon feedstock over an absorbent material comprising nickel deposited on a support material wherein nickel is present as both nickel oxide and metallic nickel and wherein the absorbent material has been conditioned by passing an inert gas flow containing a minor amount of propylene; and (b) recovering a liquid hydrocarbon stream having substantially reduced carbonyl sulfide content.Type: GrantFiled: June 1, 1993Date of Patent: November 28, 1995Assignee: Fina Research, S.A.Inventors: Guy L. G. Debras, Georges E. M. J. De Clippeleir, Raymond M. Cahen
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Patent number: 5171331Abstract: A process for production of gasoline comprising oligomerizing a C.sub.2 -C.sub.6 olefin containing feedstock over an intermediate pore size siliceous crystalline molecular sieve catalyst. The catalyst may take the form of silicalite, halogen stabilized silicalite, or a zeolite. Water may be supplied to the oligomerization reaction. The product from the oligomerization reaction is then subjected to an etherification reaction in the presence of methanol over an acid cation exchange catalyst to provide a gasoline product of enhanced octane number.Type: GrantFiled: September 17, 1990Date of Patent: December 15, 1992Assignee: Fina Research, S.A.Inventors: Guy L. G. Debras, Raymond M. Cahen, Georges E. M. J. De Clippeleir
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Patent number: 4831200Abstract: Alkynes are selectively hydrogenated in alkene rich hydrocarbon feeds, such as 1,3-butadiene-rich C.sub.4 cuts, by passing the hydrocarbon feed at least partially in liquid phase over a palladium-based catalyst in the presence of hydrogen, preferably in trickle mode, followed by passing the effluent, at least partially in liquid phase preferably containing about 300-400 ppmw alkynes, over a copper-based catalyst in the presence of hydrogen thereby producing a hydrocarbon product of significantly reduced alkyne concentration.Type: GrantFiled: December 30, 1987Date of Patent: May 16, 1989Assignee: Labofina, S.A.Inventors: Guy L. G. Debras, Georges E. M. J. De Clippeleir, Jacques F. Grootjans, Raymond M. Cahen
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Patent number: 4830735Abstract: The present invention relates to a process for removing carbonyl sulfide from a liquid hydrocarbon feedstock, said process comprising the steps of (a) passing said hydrocarbon feedstock over an absorbent material comprising nickel deposited on a support material wherein nickel is present as both nickel oxide and metallic nickel and wherein the absorbent material has been conditioned by passing an inert gas flow containing a minor amount of propylene; and (b) recovering a liquid hydrocarbon stream having a substantially reduced carbonyl sulfide content.Type: GrantFiled: September 30, 1987Date of Patent: May 16, 1989Assignee: Labofina, S.A.Inventors: Guy L. G. Debras, Georges E. M. J. De Clippeleir, Raymond M. Cahen
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Patent number: 4781906Abstract: A novel crystalline silica composition having a silica to alumina atomic ratio not lower than 80 and having a certain specific X-ray diffraction pattern after calcination in air for at least 3 hours at a temperature of at least 500.degree. C.Type: GrantFiled: December 19, 1983Date of Patent: November 1, 1988Assignee: Labofina, S.A.Inventors: Raymond M. Cahen, Guy L. G. Debras, Georges E. M. J. DeClippeleir
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Patent number: 4772456Abstract: Disclosed is a process for preparing crystalline silicas having the monoclinic symmetry which comprises the step of calcining in air for at least 3 hours at a temperature of at least 500.degree. C. a crystalline silica of the silicalite type having a silica to alumina atomic ratio of at least 80.Type: GrantFiled: December 19, 1983Date of Patent: September 20, 1988Assignee: Labofina, S.A.Inventors: Georges E. M. J. DeClippeleir, Raymond M. Cahen, Hugo Van Thillo, Guy L. G. Debras
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Patent number: 4748291Abstract: A catalytic treatment process is disclosed, which is carried out under pressure, in the presence of water, and with a molecular sieve catalyst which is TEA-silicate or silicalite previously stabilized by halogenation. This process may be applied to the aromatization or to the isomerization of hydrocarbon feedstocks, and to the oligomerization of olefins. The conversion rate of the process is very stable as a function of time.Type: GrantFiled: January 29, 1987Date of Patent: May 31, 1988Assignee: Labofina, S.A.Inventors: Guy L. G. Debras, Raymond M. Cahen, Georges E. M. J. De Clippeleir
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Patent number: 4613724Abstract: The present invention relates to a process for removing carbonyl sulfide from a liquid olefinic hydrocarbon feedstock comprising (a) passing said hydrocarbon feedstock over an absorbent material comprising zinc oxide and a promoter selected from the group consisting of alumina, silico-aluminas and any combination thereof; and (b) recovering a liquid olefinic hydrocarbon stream having a substantially reduced carbonyl sulfide content.Type: GrantFiled: July 9, 1985Date of Patent: September 23, 1986Assignee: Labofina, S.A.Inventors: Guy L. G. Debras, Georges E. M. J. De Clippeleir, Raymond M. Cahen
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Patent number: 4599473Abstract: A process for the selective alkylation of monoalkylbenzene into dialkylbenzenes wherein the para isomer of the disubstituted product is present in a concentration greater than in a thermodynamic equilibrium is provided.The method comprises passing the monoalkylbenzene and an alkylating agent capable of methylation, ethylation or propylation through a reaction zone containing an unmodified crystalline silica catalyst of the silicalite type having the monoclinic symmetry.Type: GrantFiled: December 19, 1983Date of Patent: July 8, 1986Assignee: Cosden Technology, Inc.Inventors: Guy L. G. Debras, Georges E. M. J. De Clippeleir, Raymond M. Cahen
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Patent number: 4587375Abstract: A process for the isomerization of n-butenes, comprising contacting, at elevated temperatures, a feed containing n-butenes with a catalyst comprising a crystalline silica polymorph of the silicalite type in the presence of stream to recover a steam containing isobutene. The reaction can be carried out in either liquid or vapor phase.Type: GrantFiled: April 3, 1985Date of Patent: May 6, 1986Assignee: Labofina, S.A.Inventors: Guy L. G. Debras, Georges E. M. J. De Clippeleir, Raymond M. Cahen
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Patent number: 4556753Abstract: A process for producing isobutene, comprising contacting, at elevated temperatures, a feed containing propylene with a catalyst comprising a crystalline silica polymorph of the silicalite type in the presence of steam to recover a stream containing isobutene. The reaction can be carried out in either liquid or vapor phase.Type: GrantFiled: April 3, 1985Date of Patent: December 3, 1985Assignee: Labofina, S.A.Inventors: Guy L. G. Debras, Georges E. M. J. De Clippeleir, Raymond M. Cahen