Patents by Inventor Dennis Hucul
Dennis Hucul 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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Publication number: 20100139152Abstract: A heterogeneous catalyst for use in esterification and/or transesterification reactions is provided having the formula AxB2-xO4-x, where x is between 0.25 and 1.2, A is selected from calcium, magnesium, strontium, or barium, and B is selected from manganese, cerium, titanium, zirconium, silicon, tin or germanium. The heterogeneous catalyst is formed by co-precipitating the corresponding nitrates of the catalyst materials with ammonium carbonate to form a precipitated product which is then calcined. The heterogeneous catalysts can be used to make mono-alkyl ester fuel from feedstocks containing waste oils, fats and grease in the presence of water and/or free fatty acids.Type: ApplicationFiled: December 7, 2009Publication date: June 10, 2010Inventors: Dennis Hucul, Richard S. Shull
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Patent number: 6399538Abstract: A hydrogenation catalyst and a process for hydrogenating an unsaturated polymer comprising contacting the unsaturated polymer with a hydrogenating agent in the presence of a mixed hydrogenation catalyst, characterized in that the mixed hydrogenation catalyst comprises a Group VIII metal component and at least one component selected from the group consisting of a rhenium, molybdenum, tungsten, tantalum and niobium component.Type: GrantFiled: November 21, 2000Date of Patent: June 4, 2002Assignee: The Dow Chemical CompanyInventor: Dennis A. Hucul
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Patent number: 6395841Abstract: The present invention is a continuous process for hydrogenating an unsaturated polymer comprising: contacting the unsaturated polymer with a hydrogenating agent in a fixed bed reactor, wherein the reactor is packed with a hydrogenation catalyst characterized in that the hydrogenation catalyst comprises a Group VIII metal component and at least one deactivation resistant component.Type: GrantFiled: November 21, 2000Date of Patent: May 28, 2002Assignee: The Dow Chemical CompanyInventors: Edward M. Calverley, Avani Patel, Dennis A. Hucul, Jonathan H. Siddall
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Patent number: 6376622Abstract: The present invention is directed to a hydrogenation catalyst and a process for hydrogenating an aromatic polymer having a number average molecular weight (Mn) of from 40,000 to less than 120,000 comprising contacting the aromatic polymer with a hydrogenating agent in the presence of a silica supported metal hydrogenation catalyst, characterized in that the silica has a pore size distribution such that at least 95 percent of the pore volume is defined by pores having diameter from 300 to 1000 angstroms, less than 4 percent of the pore volume is defined by pores having a diameter of 200 angstroms or less and at least 80 percent aromatic hydrogenation is achieved.Type: GrantFiled: November 21, 2000Date of Patent: April 23, 2002Assignee: The Dow Chemical CompanyInventor: Dennis A. Hucul
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Patent number: 6350922Abstract: A process for making 2,3-dihalopropanol including reacting 2,3-dihalopropanal with a hydrogenating agent in the presence of an iridium and a second transition metal mixed metal catalyst where the second transition metal is selected from the group comprising ruthenium, iron, molybdenum, tungsten, rhenium, osmium, manganese or vanadium, under conditions such that 2,3-dihalopropanol is formed. The 2,3-dihalopropanol is particularly useful in a process for making epihalohydrin.Type: GrantFiled: December 16, 1999Date of Patent: February 26, 2002Assignee: The Dow Chemical CompanyInventors: Paul C. Vosejpka, Dennis A. Hucul, Bob R. Maughon, Larry N. Ito, Robert M. Campbell
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Publication number: 20010008948Abstract: Aliphatic primary alcohols, including aliphatic primary alcohols possessing one or more oxygen, nitrogen and/or phosphorus heteroatoms that may be atoms substituting for carbon atoms in the alkyl group or component atoms of substituents on the alkyl group, were converted into salts of carboxylic acids by contacting an alkaline aqueous solution of the primary alcohol with a catalyst comprising cobalt, copper, and at least one of cerium, iron, zinc, and zirconium. Diethanolamine, for example, was converted to sodium iminodiacetate by treatment in an aqueous medium containing sodium hydroxide with a catalyst that was obtained by reducing a mixture of cobalt, copper, and zirconium oxides with hydrogen.Type: ApplicationFiled: February 5, 2001Publication date: July 19, 2001Inventors: James W. Ringer, David C. Molzahn, Dennis A. Hucul
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Patent number: 6229045Abstract: Aliphatic primary alcohols, including aliphatic primary alcohols possessing one or more oxygen, nitrogen and/or phosphorus heteroatoms that may be atoms substituting for carbon atoms in the alkyl group or component atoms of substituents on the alkyl group, were converted into salts of carboxylic acids by contacting an alkaline aqueous solution of the primary alcohol with a catalyst comprising cobalt, copper, and at least one of cerium, iron, zinc, and zirconium. Diethanolamine, for example, was converted to sodium iminodiacetate by treatment in an aqueous medium containing sodium hydroxide with a catalyst that was obtained by reducing a mixture of cobalt, copper, and zirconium oxides with hydrogen.Type: GrantFiled: September 14, 1999Date of Patent: May 8, 2001Assignee: Dow AgroSciences LLCInventors: James W. Ringer, Dennis A. Hucul, David C. Molzahn
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Patent number: 6172165Abstract: The present invention is a process of hydrogenating high molecular weight aromatic polymers comprising hydrogenating the high molecular weight aromatic polymer in the presence of a silica supported metal hydrogenation catalyst, characterized in that the silica has a pore size distribution such that at least 98 percent of the pore volume is defined by pores having diameter of greater than 600 angstroms.Type: GrantFiled: July 24, 1998Date of Patent: January 9, 2001Assignee: The Dow Chemical CompanyInventors: Dennis A. Hucul, Stephen F. Hahn
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Patent number: 6090359Abstract: The present invention is a process of hydrogenating high molecular weight aromatic polymers comprising hydrogenating the high molecular weight aromatic polymer in the presence of a silica supported metal hydrogenation catalyst, characterized in that the silica has a pore size distribution such that at least 98 percent of the pore volume is defined by pores having diameter of greater than 600 angstroms.Type: GrantFiled: February 17, 1998Date of Patent: July 18, 2000Assignee: The Dow Chemical CompanyInventor: Dennis A. Hucul
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Patent number: 5700878Abstract: The present invention is a process of hydrogenating high molecular weight aromatic polymers comprising hydrogenating the high molecular weight aromatic polymer in the presence of a silica supported metal hydrogenation catalyst, characterized in that the silica has a pore size distribution such that at least 98 percent of the pore volume is defined by pores having diameter of greater than 600 angstroms.Type: GrantFiled: April 3, 1996Date of Patent: December 23, 1997Assignee: The Dow Chemical CompanyInventors: Dennis A. Hucul, Stephen F. Hahn
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Patent number: 5654253Abstract: The present invention is a process of hydrogenating high molecular weight aromatic polymers comprising hydrogenating the high molecular weight aromatic polymer in the presence of a silica supported metal hydrogenation catalyst, characterized in that the silica has a pore size distribution such that at least 98 percent of the pore volume is defined by pores having diameter of greater than 600 angstroms.Type: GrantFiled: April 3, 1996Date of Patent: August 5, 1997Assignee: The Dow Chemical CompanyInventors: Dennis A. Hucul, Stephen F. Hahn
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Patent number: 5612422Abstract: The present invention is a process of hydrogenating high molecular weight aromatic polymers comprising hydrogenating the high molecular weight aromatic polymer in the presence of a silica supported metal hydrogenation catalyst, characterized in that the silica has a pore size distribution such that at least 98 percent of the pore volume is defined by pores having diameter of greater than 600 angstroms.Type: GrantFiled: May 4, 1995Date of Patent: March 18, 1997Assignee: The Dow Chemical CompanyInventors: Dennis A. Hucul, Stephen F. Hahn
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Patent number: 5583268Abstract: A process of catalytically reacting a 3-18 carbon mono-olefin such as cyclohexene with an arylhydroxide such as phenol in the liquid phase forming an ortho-alkylated arylhydroxide which is subsequently catalytically dehydrogentated to form an ortho-alkenylarylhydroxide or ortho-arylarylhydroxide such as ortho-phenylphenol.Type: GrantFiled: December 15, 1995Date of Patent: December 10, 1996Assignee: The Dow Chemical CompanyInventors: Guo-shuh J. Lee, Juan M. Garces, Dennis A. Hucul, Tracy L. Young, Kenneth A. Burdett
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Patent number: 5336822Abstract: 4-Vinylcyclohexene is converted to styrene in the presence of a catalyst comprising tin, antimony, and oxygen. The feed stream to be contacted with the catalyst comprises water, 4-vinylcyclohexene, and oxygen. A ratio of water to 4-vinylcyclohexene above about 12:1, preferably above about 14:1, significantly increases the half-life of the catalyst. The catalyst is prepared by coprecipitating a tin chloride and an antimony chloride followed by calcination of the precipitate at a temperature in the range from 850.degree. C. to 1000.degree. C.Type: GrantFiled: June 14, 1993Date of Patent: August 9, 1994Assignee: The Dow Chemical CompanyInventor: Dennis A. Hucul
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Patent number: 5110779Abstract: The hydrogenation of unsaturated polymers is effected employing a heterogeneous catalyst comprising a Group VIII metal and a porous support wherein the porous support is characterized by a pore size distribution such that at least 95% of the pore volume is defined by pores having diameters greater than 450 angstroms and the ratio of metal surface area to carrier surface area is in the range from about 0.07-0.75:1.Type: GrantFiled: May 7, 1991Date of Patent: May 5, 1992Assignee: The Dow Chemical CompanyInventor: Dennis A. Hucul
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Patent number: 5028665Abstract: The hydrogenation of unsaturated polymers is effected employing a heterogeneous catalyst comprising a Group VIII metal and a porous support wherein the porous support is characterized by a pore size distribution such that at least 95% of the pore volume is defined by pores having diameters greater than 450 angstroms and the ratio of metal surface area to carrier surface area is in the range from about 0.07-0.75:1.Type: GrantFiled: January 9, 1989Date of Patent: July 2, 1991Assignee: The Dow Chemical CompanyInventor: Dennis A. Hucul
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Patent number: 5015749Abstract: An improved process for the preparation of aluminoxanes comprising contacting an aluminoxane precursor such as a hydrocarbyl substituted aluminum compound with a porous organic or inorganic aqueous imbiber material containing water sorbed or imbibed therein.Type: GrantFiled: September 7, 1989Date of Patent: May 14, 1991Assignee: The Dow Chemical CompanyInventors: Gregory F. Schmidt, Dennis A. Hucul, Richard E. Campbell, Jr.
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Patent number: 4891346Abstract: Included is a process for redispersing catalysts wherein the catalyst metal is selected from the group consisting of ruthenium, osmium, rhodium and palladium comprising contacting the catalyst serially with (1) a reducing agent; (2) a halogen redispersing agent; and (3) a reducing agent, under conditions sufficient to redisperse the sintered catalyst. A preliminary oxygen treatment is optional. Also included are the novel catalysts such as redispersed by the foregoing process and processes in which sintered catalysts are redispersed and in which the redispersed catalysts are employed.The redispersed catalysts can have very high activity and can even have activity higher than originally found. A preferred metal is palladium and a preferred support is alumina.A preferred process for employing the redispersed catalyst is the production of .alpha.-substituted acrylate esters.Type: GrantFiled: February 25, 1986Date of Patent: January 2, 1990Assignee: The Dow Chemical CompanyInventor: Dennis A. Hucul
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Patent number: 4762858Abstract: A process for the conversion of a mixture of synthesis gas into preponderantly C.sub.1-10 oxygenated hydrocarbons and especially C.sub.1-5 mixed alcohols using a reduced catalyst of the necessary components of(1) niobium, tantalum, molybdenum, tungsten, technetium and/or rhenium; and(2) yttrium, a lanthanide and/or actinide series metal;and the optional components of(3) a promoter; and/or(4) a support.High synthesis gas conversions are possible in large part due to the high catalytic activity of the reduced catalyst. The reduced catalyst composition itself with yttrium as cocatalyst metal or promoted with special levels of a Fisher-Tropsch promoter.Type: GrantFiled: October 31, 1986Date of Patent: August 9, 1988Assignee: The Dow Chemical CompanyInventors: Dennis A. Hucul, Rex R. Stevens
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Patent number: 4743705Abstract: The invention is a vapor phase process for the preparation of an a-substituted acrylate ester which comprises contacting a haloalkene, wherein the halogen is substituted on an olefinic carbon atom which is further substituted with a C.sub.1-10 alkyl, C.sub.3-10 cycloalkyl, C.sub.6-10 aryl, C.sub.7-10 alkaryl, C.sub.7-10 aralkyl, cyano, trihalomethyl group, with an alcohol or an ether, and carbon monoxide in the presence of a heterogeneous catalyst which comprises palladium, platinum, nickel, ruthenium or rhodium, on a support, under conditions such that an a-substituted acrylate ester and a hydrocarbyl halide is prepared wherein the catalyst productivity is 0.06 g of product per gram of catalyst per hour or greater.Type: GrantFiled: March 13, 1986Date of Patent: May 10, 1988Assignee: The Dow Chemical CompanyInventors: Dennis A. Hucul, Kathryn A. Eickholt