Patents by Inventor Joseph J. F. Scholten
Joseph J. F. Scholten 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: 5336810Abstract: The invention relates to a catalyst that is very suitable for the conversion of a benzoic acid into the corresponding benzaldehyde. The catalyst can be obtained via coprecipitation of a manganese salt, a salt from which an acid support is formed, a zinc salt and optionally a copper salt at a pH between 4 and 10, calcination, after precipitation, of the coprecipitate at a temperature of between 300 and 700.degree. C. and then, optionally, reduction of the calcined coprecipitate with the aid of a hydrogen-containing gas mixture. Using such a catalyst the hydrogenation of a benzoic acid can be carried out at lower temperature resulting in energy-savings and, hence, cost-savings.Type: GrantFiled: May 7, 1993Date of Patent: August 9, 1994Assignee: DSM N.V.Inventors: Paul C. Van Geem, Xiaoding Xu, Joseph J. F. Scholten
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Patent number: 4473539Abstract: Process for preparing high mechanical strength pure silicon dioxide suitable for demanding high-grade technical applications including the combination of steps of (a) forming a reaction mixture containing a silicon dioxide precipitate by controllably and gradually admixing with firm agitation an at most 15 weight percent aqueous solution of hexafluorosilicic acid with an about 15 to about 35 weight percent ammonium hydroxide solution at about 25.degree. C. to about 45.degree. C. until the pH is about 8.5 to about 9.2 in the thus formed mixture containing a silicon dioxide precipitate; (b) separating the silicon dioxide precipitate from the mixture; (c) washing the thus separated precipitate; and (d) calcining the thus washed precipitate at about 900.degree. C. to about 1500.degree. C. Silicon dioxide produced in accordance with the present process has better physical properties than commercially available porous alpha-alumina.Type: GrantFiled: May 11, 1983Date of Patent: September 25, 1984Assignee: Stamicarbon B.V.Inventors: Joseph J. F. Scholten, Abraham Van Montfoort
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Patent number: 4434302Abstract: A catalyst and process for making same which is used for hydroformylation reactions by the conversion of an olifically unsaturated compound. The catalyst is prepared by the phosphochlorination of the polymer carrier in the presence of borontrifluoride or a borontrifluoride complex. The chlorophosphonyl groups are converted into phosphine or phosphite groups and the resultant groups are reacted with a catalytically active metal complex.Type: GrantFiled: May 19, 1981Date of Patent: February 28, 1984Assignee: Stamicarbon B.V.Inventors: Nicolaas A. De Munck, Joseph J. F. Scholten
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Patent number: 4392001Abstract: The invention relates to a process for the preparation of a cycloalkene through partial hydrogenation of the corresponding aromatic hydrocarbon in the gas phase in the presence of a ruthenium catalyst. This hydrogenation process is carried out in the presence of water vapor.Type: GrantFiled: December 30, 1981Date of Patent: July 5, 1983Assignee: Stamicarbon, B.V.Inventors: Johannes A. Don, Joseph J. F. Scholten
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Patent number: 4386016Abstract: A process is provided for the preparation of an improved porous silicon dioxide catalyst support, wherein a silicon dioxide prepared by flame hydrolysis is converted into an aqueous gel and thereafter admixed with at least 15 vol. % of a C.sub.1 to C.sub.5 alkanol, followed by spray-drying of the resulting aqueous/alcohol silica gel. The resulting catalyst support is particularly useful with chromium oxide catalysts for polyalkene polymerizations.Type: GrantFiled: October 26, 1981Date of Patent: May 31, 1983Assignee: Stamicarbon, B.V.Inventors: Joseph J. F. Scholten, Lambertus J. M. A. vande Leemput
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Patent number: 4356125Abstract: An improved process for the conversion of allyl alcohol with hydrogen and carbon monoxide to form a reaction mixture containing hydroformylation products of 2-hydroxytetrahydrofuran and/or 4-hydroxybutyraldehyde. Allyl alcohol, hydrogen, and carbon monoxide are passed, in a gaseous phase, into contact with a catalyst comprised of a solid porous carrier material containing within its pores a solution of a catalytically active metalloorganic complex dissolved in at least one ligand-forming compound, which solution has a vapor pressure of less than 1.3 mbar under the reaction conditions applied. The improved process is preferably carried out on a continuous basis.Type: GrantFiled: April 22, 1981Date of Patent: October 26, 1982Assignee: Stamicarbon, B.V.Inventors: Nicolaas A. de Munck, Joseph J. F. Scholten
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Patent number: 4292198Abstract: An improved catalyst composition for the hydroformylation of olefinically unsaturated compounds using catalytically active organometallic complexes wherein said complexes are dissolved in a ligand-forming compound and impregnated into a porous solid carrier material which is essentially free of alkali metal ions and acid or basic groups which would otherwise be reactive with the organo-metallic commplex.Type: GrantFiled: April 14, 1980Date of Patent: September 29, 1981Assignee: Stamicarbon, B.V.Inventors: Leendert A. Gerritsen, Joseph J. F. Scholten
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Patent number: 4254297Abstract: Process for the conversion of dimethyl ether into a mixture of substantially aliphatic hydrocarbons and water by means of a catalyst containing boron. The dimethyl ether is put in contact, at a temperature of over 250.degree. C., with a catalyst that consists of a crystalline modification of silica in whose crystal lattice a number of silicon atoms have been replaced by boron atoms.The amount of boron in the crystalline modificaton, expressed as the molar ratio of the oxides B.sub.2 O.sub.3 and SiO.sub.2, may vary between 0.0005 and 0.025.Type: GrantFiled: November 27, 1979Date of Patent: March 3, 1981Assignee: Stamicarbon, B.V.Inventors: Petrus M. G. Frenken, Joseph J. F. Scholten
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Patent number: 4228261Abstract: Process for the preparation of a porous, pure silica which is particularly suitable as a catalyst support for a chromium-oxide catalyst used in polymerizing of olefins. The process comprises the steps of converting a silicon-halogen compound to a silica and then admixing with water to form a silica gel. The gel is then dried and ground to a predetermined particle size. The silica can then be made into a catalyst by placing on the support a chromium compound and then heating in a non-reducing atmosphere.Type: GrantFiled: April 23, 1979Date of Patent: October 14, 1980Assignee: Stamicarbon, B.V.Inventors: Joseph J. F. Scholten, Lambertus J. M. A. van de Leemput
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Patent number: 4228260Abstract: Process for the preparation of a porous, pure silica which is particularly suitable as a catalyst support for a chromium-oxide catalyst used in polymerizing of olefins. The process comprises the steps of converting a silicon-halogen compound to a silica and then admixing with water to form a silica gel. The gel is then spray-dried to achieve the required particle size and pore volume.The silica can then be made into a catalyst by placing on the support a chromium compound and then heating in a non-reducing atmosphere.Type: GrantFiled: April 23, 1979Date of Patent: October 14, 1980Assignee: Stamicarbon, B.V.Inventors: Joseph J. F. Scholten, Lambertus J. M. A. van de Leemput
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Patent number: 4225464Abstract: Process for the preparation of a porous, pure silica which is particularly suitable as a catalyst support for a chromium-oxide catalyst used in polymerizing of olefins. The process comprises the steps of converting a silicon-halogen compound to a silica and then admixing with water to form a silica gel. The gel is then spray-dried to achieve the required particle size and pore volume.The silica can then be made into a catalyst by placing on the support a chromium compound and then heating in a non-reducing atmosphere.Type: GrantFiled: July 14, 1978Date of Patent: September 30, 1980Assignee: Stamicarbon, B.V.Inventors: Joseph J. F. Scholten, Lambertus J. M. A. van de Leemput
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Patent number: 4224189Abstract: Process for the preparation of a porous, pure silica which is particularly suitable as a catalyst support for a chromium-oxide catalyst used in polymerizing of olefins. The process comprises the steps of converting a silicon-halogen compound to a silica and then admixing with water to form a silica gel. The gel is then dried and ground to a predetermined particle size. The silica can then be made into a catalyst by placing on the support a chromium compound and then heating in a non-reducing atmosphere.Type: GrantFiled: July 14, 1978Date of Patent: September 23, 1980Assignee: Stamicarbon, B.V.Inventors: Joseph J. F. Scholten, Lambertus J. M. A. Van de Leemput
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Patent number: 4193942Abstract: Olefinically unsaturated compounds are subjected to hydroformylation to produce the corresponding aldehyde having an additional carbon atom by reacting the compound with hydrogen and carbon monoxide under appropriate conditions of temperature and pressure in the presence of a catalytically active metallo-organic complex in the pores of a solid porous carrier in the form of a solution in a ligand-forming electron-donating phosphorous compound, such as triethyl phosphine, that has a vapor pressure of less than 15 mbar under reaction conditions. The central atom of the metallo-organic complex is preferably rhodium, cobalt, ruthenium or irridium.Type: GrantFiled: January 18, 1978Date of Patent: March 18, 1980Assignee: Stamicarbon, B.V.Inventors: Leendert A. Gerritsen, Joseph J. F. Scholten
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Patent number: 4111842Abstract: A process for preparing activated carbon supported catalysts by mixing an activated carbon support having acid surface groups with an aqueous solution containing one or more cations selected from the groups IB and VIII of the Periodic System of Elements as well as Zn to effect cation exchange with the acid groups on the surface of the activated carbon support, separating the cation exchanged activated carbon. Said exchanged surface cations are thereafter reduced on the carbon support in the medium which is later to be subjected to the catalyzed reaction. The surface of the activated carbon support may be oxidized to increase the number of acid groups per unit area prior to ion exchange.Type: GrantFiled: June 1, 1977Date of Patent: September 5, 1978Assignee: Stamicarbon, B.V.Inventors: Abraham van Montfoort, Joseph J. F. Scholten
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Patent number: 4081516Abstract: A process for forming hydroxylamine and/or its salt, by reducing nitrogen monoxide, nitric acid, or a nitrate salt and improvements therein, wherein starch, gelatin, polyacrylamide or polyvinyl alcohol is added to the reaction mixture.Type: GrantFiled: September 18, 1975Date of Patent: March 28, 1978Assignee: Stamicarbon, B.V.Inventors: Joseph J. F. Scholten, Hendrik L. T. Koks
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Patent number: 4052336Abstract: The invention relates to a process for preparing active noble-metal catalysts on a carbon carrier. In particular, the process comprises adsorbing a salt of the catalytically active metal onto the carbon in an aqueous medium; hydrolyzing said salt to the oxide or hydroxide, by employing a basic reagent; and reducing said oxide or hydroxide to the metal.Type: GrantFiled: March 9, 1976Date of Patent: October 4, 1977Assignee: Stamicarbon B.V.Inventors: Abraham van Montfoort, Joseph J. F. Scholten
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Patent number: 3962139Abstract: Powdery alloys of two or more metals, as well as of alloys distributed in finely divided state over a carrier material, e.g., catalysts consisting of an alloy of two or more metals, are obtained by adding one of the metals as a powder or in finely divided state on a carrier to a liquid which contains a dissolved compound of the metal or dissolved compounds of the metals to be alloyed, whereupon the metal particles are treated with a reducing agent.In this way an alloy is formed without the risk for sintering of the formed alloy particles.Type: GrantFiled: November 28, 1973Date of Patent: June 8, 1976Assignee: Stamicarbon B.V.Inventors: Cornelis G. M. van de Moesdijk, Joseph J. F. Scholten, Jacobus J. M. G. Eurlings