Patents by Inventor Jean-Michel Popa
Jean-Michel Popa 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: 6018057Abstract: A process for producing anhydrides by passing a solution of the acid, preferably an organic polyacid, which is to undergo anhydridation over an acidified clay and a process for producing the catalysts therefor.Type: GrantFiled: July 7, 1993Date of Patent: January 25, 2000Assignee: Rhodia ChimieInventors: Michel Alas, Michel Gubelmann, Jean-Michel Popa
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Patent number: 6005145Abstract: The present invention relates to new metal compounds, to a process for the preparation of these metal compounds and to their use as catalysts.The new metal compounds according to the invention have, when they are used as catalysts, in particular as hydrogenation catalysts, an efficiency of the same order as that obtained with Raney nickel or cobalt.These metal compounds are more precisely compounds containing one or a number of divalent metals at least partially in the reduced state, bulked by a phase comprising one or a number of doping metals chosen from chromium, molybdenum, iron, manganese, titanium, vanadium, gallium, indium, bismuth, yttrium, cerium, lanthanum and the other trivalent lanthanides, in the form of oxides.Type: GrantFiled: August 3, 1998Date of Patent: December 21, 1999Assignee: Rhone-Poulenc Fiber and Resin IntermediatesInventors: Georges Cordier, Jean-Michel Popa
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Patent number: 5973210Abstract: The present invention relates to a composition which can be used as reduction catalyst.This composition is characterized in that it comprises a support whose constituent material comprises at least one oxide chosen from oxides which are inert or capable of being made inert relative to the reaction mixture and a phase at least partially covering the said support, of which at least part comprises an intermetallic ruthenium-tin compound of composition Ru.sub.3 Sn.sub.7. The invention also describes the use of the reduction catalyst and its application to organic synthesis.Type: GrantFiled: July 31, 1997Date of Patent: October 26, 1999Assignee: Rhone-Poulenc ChimieInventors: Roland Jacquot, Jean-Marc LeClercq, Claude Mercier, Jean-Michel Popa
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Patent number: 5399336Abstract: Calcined silica/oxide zeolites, characteristically MFI stannozeosilites or zirconozeosilites, well adopted for catalyzing the H.sub.2 O.sub.2 hydroxylation of phenols or phenol ethers, have the formula (I):(Si.sub.96-x T'.sub.x)0.sub.192 (I)in which x is a number ranging from 0.1 to 5.0 and T' is tetravalent tin or tetravalent zirconium.Type: GrantFiled: July 1, 1991Date of Patent: March 21, 1995Assignee: Rhone-Poulenc ChimieInventors: Jean-Louis Guth, Michel Costantini, Annie Lopez, Jean-Michel Popa
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Patent number: 5380691Abstract: Highly microporous zirconia particulates having pore sizes of an average diameter of less than 20 .ANG. (2 nm), well adapted as catalysts and catalyst supports, are prepared by thermohydrolyzing a zirconium salt, separating the resulting precipitate from the medium of thermohydrolysis and then calcining such precipitate, and wherein an anion more covalent than the hydroxyl anion, e.g., a nitrate, sulfate, phosphate or carboxylate, is incorporated into such precipitate upstream of the calcination thereof.Type: GrantFiled: June 12, 1992Date of Patent: January 10, 1995Assignee: Rhone-Poulenc ChimieInventor: Jean-Michel Popa
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Patent number: 5260456Abstract: A process for producing anhydrides by passing a solution of the acid, preferably an organic polyacid, which is to undergo anhydridation over an acidified clay and a process for producing the catalysts therefor.Type: GrantFiled: April 21, 1992Date of Patent: November 9, 1993Assignee: Rhone-Poulenc ChimieInventors: Michel Alas, Michel Gubelmann, Jean-Michel Popa
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Patent number: 5254746Abstract: The phenols and phenol ethers are hydroxylated by reaction with hydrogen peroxide in the presence of a catalytically effective amount of a titanozeosilite, advantageously a silicon oxide/titanium oxide MFI zeolite having the general formula:SI.sub.(96-x), Ti.sub.x O.sub.192.Type: GrantFiled: August 19, 1992Date of Patent: October 19, 1993Assignee: Rhone-Poulenc ChimieInventors: Michel Costantini, Jean-Michel Popa, Michel Gubelmann
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Patent number: 5246688Abstract: MFI zeolites based on silicon oxide and, optionally, the oxides of titanium, germanium, zirconium and/or tin, are produced by (1) heating an aqueous, homogeneous reaction mixture which comprises (a) an M.sub.2/n SiF.sub.6 complex (I), wherein M is a cation of valency n, optionally, at least one M.sub.2/n T'F.sub.6 complex (II), wherein T' is titanium, zirconium, germanium and/or tin, (b) a reagent providing OH. ions by hydrothermal decomposition and a structuring agent (c), e.g., a tertiary amine or a quaternary ammonium compound, whereby a zeolite precipitate is formed therein, and (2) separating and calcining such precipitate to eliminate structuring agent from the pores and channels of the resulting zeolite.Type: GrantFiled: August 29, 1991Date of Patent: September 21, 1993Assignee: Rhone-Poulenc ChimieInventors: Anne C. Faust, Jean-Louis Guth, Frederique Hoffner, Jean-Michel Popa
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Patent number: 5208196Abstract: Novel aluminum bridged clays having an interfoliate spacing of at least 1 nm, well adapted as catalysts/catalyst supports, are prepared by (a) controlledly introducing an aqueous solution of a hydroxide base into an aqueous reaction medium containing suspended clay particulates and a dissolved aluminum salt, at a rate and for such period of time that the ratio of the concentration [C] of the base, in moles of OH.sup.- and expressed in moles/liter, to the duration (h) of introducing such OH.sup.- values, expressed in hours, is at least 0.1, and (b) recovering the reaction product bridged clay thus produced (and optionally drying/lyophilizing and/or calcining same).Type: GrantFiled: December 27, 1990Date of Patent: May 4, 1993Assignee: Rhone-Poulenc ChimieInventors: Alain Aubry, Jean-Michel Popa
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Patent number: 5160496Abstract: The phenols and phenol ethers are economically and efficiently hydroxylated using hydrogen peroxide, in the presence of a catalytically effective amount of a bridged clay, e.g., a zeolite or smectite.Type: GrantFiled: July 16, 1990Date of Patent: November 3, 1992Assignee: Rhone-Poulenc ChimieInventors: Michel Constantini, Jean-Michel Popa
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Patent number: 5149888Abstract: The phenols and phenol ethers, e.g., phenol itself, are effectively hydroxylated by reacting hydrogen peroxide therewith, in the presence of a catalytically effective amount of titanium dioxide.Type: GrantFiled: February 28, 1990Date of Patent: September 22, 1992Assignee: Rone-Poulenc ChimieInventors: Michel Costantini, Eric Garcin, Michel Gubelmann, Jean-Michel Popa
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Patent number: 5118651Abstract: The invention relates to chemical compounds and their use as catalysts in the solvolysis of alkyl halides. The chemical compounds, when dry, have formula (I):(EO.sub.4 M).multidot.(Imp)p (I)wherein E is selected from the group consisting of phosphorus, arsenic, antimony and bismuth, and is preferably phosphorus, and M is a metal or a mixture of metals.Imp corresponds to a basic impregnating compound consisting of alkaline earth metal, or preferably alkali metal, and their mixtures in combination with a counter-anion to ensure electrical neutrality.The coefficient p is between 10.sup.-2 and 1/3.Type: GrantFiled: February 1, 1991Date of Patent: June 2, 1992Assignee: Rhone-Poulenc ChimieInventors: Michel Gubelmann, Philippe-Jean Tirel, Claude Doussain, Helene Pernot, Laurent Gilbert, Jean-Michel Popa
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Patent number: 5082641Abstract: Novel MFI zeolites based on the oxides of silicon and titanium, well adapted as selective adsorbents, catalysts and catalyst supports, have the following formula: ##STR1## wherein x ranges from about 0.1 to 6.Type: GrantFiled: May 23, 1988Date of Patent: January 21, 1992Assignee: Rhone-Poulenc ChimieInventors: Jean-Michel Popa, Jean-Luc Guth, Henri Kessler
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Patent number: 5055623Abstract: Phenol/substituted phenols are prepared by directly hydroxylating an aromatic substrate with nitrous oxide, in vapor phase, in the presence of a modified (acidified) ZSM-5 or ZSM-11 zeolite, containing such elements as Ga, Fe, B, In, Cr, Sc, Co, Ni, Be, Zn, Cu, Sb, As or V.Type: GrantFiled: June 22, 1990Date of Patent: October 8, 1991Assignee: Rhone-Poulenc ChimieInventors: Michel Gubelmann, Jean-Michel Popa, Philipe-Jean Tirel
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Patent number: 5003114Abstract: Phenols/phenol ethers are hydroxylated by reaction with hydrogen peroxide in the presence of a catalytically effective amount of a calcined germanozeosilite MFI zeolite.Type: GrantFiled: June 7, 1989Date of Patent: March 26, 1991Assignee: Rhone-Poulenc ChimieInventors: Michel Costantini, Michel Gubelmann, Jean-Pierre Lecomte, Jean-Michel Popa
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Patent number: 4996376Abstract: Dinitrotoluenes are prepared by reacting mononitrotoluene(s) with nitric acid, in liquid phase, in the presence of an inorganic and acidic solid including at least one component selected from among orthophosphoric acid, pyrophosphoric acid, metaphosphoric acid, a metal dihydrogen phosphate, a metal hydrogen phosphate, a metal orthophosphate or a metal pyrophosphate, such metal cations having from 1 to 5 positive charges.Type: GrantFiled: October 24, 1989Date of Patent: February 26, 1991Assignee: Rhone-Poulenc ChimieInventors: Claude Doussain, Michel Gubelmann, Jean-Michel Popa
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Patent number: 4976944Abstract: Impure gaseous silane containing such impurities as, in particular, phosphines and arsines, is purified, whether by chemisorption and/or physical adsorption, by contacting such silane gas with a sorption mass that includes cooper values, e.g., a copper cation-exchanged molecular sieve.Type: GrantFiled: October 24, 1988Date of Patent: December 11, 1990Assignee: Rhone-Poulenc ChimieInventors: Bernard Pacaud, Jean-Michel Popa, Claude-Bernard Cartier