Patents by Inventor David C. Molzahn

David C. Molzahn 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).

  • Publication number: 20080108800
    Abstract: Spinetoram is selectively produced in excellent yields by hydrogenating a mixture of 3?-O-ethyl spinosyn J and 3?-O-ethyl spinosyn L in a water miscible organic solvent using hydrogen gas and a heterogeneous catalyst.
    Type: Application
    Filed: November 2, 2007
    Publication date: May 8, 2008
    Applicant: Dow AgroSciences LLC
    Inventors: David E. Podhorez, Gary A. Roth, David C. Molzahn, Timothy Adaway
  • Patent number: 6642423
    Abstract: Ethoxylations of various initiator compounds are performed in the presence of metal cyanide catalysts. The catalysts surprisingly form a wide variety of polyether products that in most cases contain only small amounts of high molecular weight poly(ethylene oxide).
    Type: Grant
    Filed: April 24, 2002
    Date of Patent: November 4, 2003
    Assignee: Dow Global Technologies, Inc.
    Inventors: Katherine S. Clement, Louis L. Walker, Richard M. Wehmeyer, Robert H. Whitmarsh, David C. Molzahn, William P. Dianis, David E. Laycock, John W. Weston, Richard J. Elwell
  • Publication number: 20020198413
    Abstract: Ethoxylations of various initiator compounds are performed in the presence of metal cyanide catalysts. The catalysts surprisingly form a wide variety of polyether products that in most cases contain only small amounts of high molecular weight poly(ethylene oxide).
    Type: Application
    Filed: April 24, 2002
    Publication date: December 26, 2002
    Inventors: Katherine S. Clement, Louis L. Walker, Richard M. Wehmeyer, Robert H. Whitmarsh, David C. Molzahn, William P. Dianis, Daivd E. Laycock, John W. Weston, Richard J. Elwell
  • Patent number: 6429342
    Abstract: Ethoxylations of various initiator compounds are performed in the presence of metal cyanide catalysts. The catalysts surprisingly form a wide variety of polyether products that in most cases contain only small amounts of high molecular weight poly(ethylene oxide).
    Type: Grant
    Filed: July 7, 2000
    Date of Patent: August 6, 2002
    Assignee: Dow Global Technologies Inc.
    Inventors: Katherine S. Clement, Louis L. Walker, Richard M. Wehmeyer, Robert H. Whitmarsh, David C. Molzahn, William P. Dianis, David E. Laycock
  • Patent number: 6423662
    Abstract: Metal cyanide catalysts are prepared by first forming a precipitate using no more than a stoichiometric amount of a water-soluble metal salt of the form MxAy, based on the amount of metal cyanide compound that is used. The precipitate is then treated with an additional quantity of a metal salt of the form M3xAy, in which M3 may be the same as or different than M. The catalyst is treated with a complexing agent, either during the precipitation step or during the subsequent treatment with the M3xAy salt.
    Type: Grant
    Filed: May 19, 2000
    Date of Patent: July 23, 2002
    Assignee: Dow Global Technologies Inc.
    Inventors: David C. Molzahn, William P. Dianis
  • Publication number: 20010008948
    Abstract: 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: Application
    Filed: February 5, 2001
    Publication date: July 19, 2001
    Inventors: James W. Ringer, David C. Molzahn, Dennis A. Hucul
  • Patent number: 6229045
    Abstract: 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: Grant
    Filed: September 14, 1999
    Date of Patent: May 8, 2001
    Assignee: Dow AgroSciences LLC
    Inventors: James W. Ringer, Dennis A. Hucul, David C. Molzahn
  • Patent number: 5554793
    Abstract: A process of reforming an alkyleneamine feedstock or a mixture of such feedstocks to an alkyleneamine or a mixture of alkyleneamines which is different from the feedstock or feedstock mixture. The process is catalyzed by one of the following: Group VB metal oxides, Group VB metal phosphates, Group IIA metal silicates, and tungsten oxides. For example, ethylenediamine is contacted with a catalyst of niobic acid or magnesium silicate to yield predominantly diethylenetriamine and non-cyclic triethylenetetramines; whereas high molecular weight polyethylenepolyamines are cracked by the same catalysts to mixtures of lower molecular weight linear and cyclic materials.
    Type: Grant
    Filed: December 19, 1994
    Date of Patent: September 10, 1996
    Assignee: The Dow Chemical Company
    Inventors: George E. Hartwell, Robert G. Bowman, David C. Molzahn
  • Patent number: 5410087
    Abstract: A process of reforming an alkyleneamine feedstock or a mixture of such feedstocks to an alkyleneamine or a mixture of alkyleneamines which is different from the feedstock or feedstock mixture. The process is catalyzed by one of the following: Group VB metal oxides, Group VB metal phosphates, Group IIA metal silicates, and tungsten oxides. For example, ethylenediamine is contacted with a catalyst of niobic acid or magnesium silicate to yield predominantly diethylenetriamine and non-cyclic triethylenetetramines; whereas high molecular weight polyethylenepolyamines are cracked by the same catalysts to mixtures of lower molecular weight linear and cyclic materials.
    Type: Grant
    Filed: November 17, 1993
    Date of Patent: April 25, 1995
    Assignee: The Dow Chemical Company
    Inventors: George E. Hartwell, David C. Molzahn, Robert G. Bowman
  • Patent number: 5387708
    Abstract: A process for the production of dialkyl carbonates, such as dimethyl carbonate. In one aspect, the process involves contacting under reaction conditions an alkanol, such as methanol, with carbon monoxide and oxygen in the vapor phase and in the presence of a catalyst containing (1) a copper halide, a copper oxyhalide, or a copper carboxylate halide, (2) a quaternary ammonium salt, and (3) a support component. The catalyst achieves high selectivity and productivity to dialkyl carbonates. In a second aspect, the addition of a chlorocarbon catalyst regenerator to the alkanol feed increases catalyst stability and lifetime and increases the selectivity and/or productivity to dialkyl carbonates.
    Type: Grant
    Filed: December 10, 1993
    Date of Patent: February 7, 1995
    Assignee: The Dow Chemical Company
    Inventors: David C. Molzahn, Mark E. Jones, George E. Hartwell, Jose Puga
  • Patent number: 5288909
    Abstract: A process of reforming an alkyleneamine feedstock or a mixture of such feedstocks to an alkyleneamine or a mixture of alkyleneamines which is different from the feedstock or feedstock mixture. The process is catalyzed by one of the following: Group VB metal oxides, Group VB metal phosphates, Group IIA metal silicates, and tungsten oxides. For example, ethylenediamine is contacted with a catalyst of niobic acid or magnesium silicate to yield predominantly diethylenetriamine and non-cyclic triethylenetetramines; whereas high molecular weight polyethylenepolyamines are cracked by the same catalysts to mixtures of lower molecular weight linear and cyclic materials.
    Type: Grant
    Filed: August 19, 1992
    Date of Patent: February 22, 1994
    Assignee: The Dow Chemical Company
    Inventors: George E. Hartwell, Robert G. Bowman, David C. Molzahn
  • Patent number: 5256786
    Abstract: A process of reforming cyclic alkyleneamines to amine-extended cyclic alkyleneamines involving contacting a cyclic alkyleneamine or mixture of cyclic alkyleneamines in the liquid phase with a catalyst under reaction conditions. The catalyst is selected from the group consisting of (a) Group VB metal oxides, (b) Group VB metal phosphates, (c) silicates of Groups IIA, IIIB, IVB and VB, and (d) specified tungsten oxides. For example, piperazine or a mixture of piperazine and aminoethylpiperazine is contacted with magnesium silicate to yield a mixture of amine-extended piperazines, including 1,2-bis(piperazinyl)-ethane and N,N'-bis(2-piperazinylethyl)piperazine.
    Type: Grant
    Filed: March 2, 1992
    Date of Patent: October 26, 1993
    Assignee: The Dow Chemical Company
    Inventors: Robert G. Bowman, David C. Molzahn, George E. Hartwell
  • Patent number: 5210307
    Abstract: A process for reforming alkyleneamines to predominantly linearly-extended polyalkylenepolyamines comprising contacting an alkyleneamine or mixture thereof with a catalyst under conditions such that a mixture of polyalkylenepolyamines enriched in linearly-extended products is formed, said catalyst containing at least one compound selected from the group consisting of (a) Group VB metal oxides, (b) Group VB metal phosphates, (c) silicates of Groups IIA, IIIB, IVB, VB, and the lanthanide and actinide metals, and (d) tungsten oxides, with the proviso that the silicates and tungsten oxides are essentially free of aluminum. For example, ethylenediamine is contacted with a catalyst of niobium phosphate or niobic acid under reaction conditions to yield predominantly non-cyclic polyethylenepolyamines.
    Type: Grant
    Filed: January 31, 1992
    Date of Patent: May 11, 1993
    Assignee: The Dow Chemical Company
    Inventors: Robert G. Bowman, David C. Molzahn, George E. Hartwell
  • Patent number: 5166442
    Abstract: A process of reforming an alkyleneamine feedstock or a mixture of such feedstocks to an alkyleneamine or a mixture of alkyleneamines which is different from the feedstock or feedstock mixture. The process is catalyzed by one of the following: Group VB metal oxides, Group VB metal phosphates, Group IIA metal silicates, and tungsten oxides. For example, ethylenediamine is contacted with a catalyst of niobic acid or magnesium silicate to yield predominantly diethylenetriamine and non-cyclic triethylenetetramines; whereas high molecular weight polyethylenepolyamines are cracked by the same catalysts to mixtures of lower molecular weight linear and cyclic materials.
    Type: Grant
    Filed: July 16, 1991
    Date of Patent: November 24, 1992
    Assignee: The Dow Chemical Company
    Inventors: George E. Hartwell, Robert G. Bowman, David C. Molzahn
  • Patent number: 5145987
    Abstract: A process is disclosed for preparing cyclohexane tricarboxylic acids and esters thereof comprising contacting carbon monoxide, cis-1,2,3,6-tetrahydrophthalic acid anhydride and water or a lower alkanol at elevated pressure and temperature and in the presence of a palladium complex and an ether solvent wherein the selectivity to cis-1,2-trans-4-cyclohexane tricarboxylic acids and esters thereof is greater than that obtained in the absence of the ether solvent.
    Type: Grant
    Filed: May 22, 1991
    Date of Patent: September 8, 1992
    Assignee: The Dow Chemical Company
    Inventor: David C. Molzahn
  • Patent number: 5118850
    Abstract: A process for reforming alkyleneamines to predominantly linearly-extended polyalkylenepolyamines comprising contacting an alkyleneamine or mixture thereof with a catalyst under conditions such that a mixture of polyalkylenepolyamines enriched in linearly-extended products is formed, said catalyst containing at least one compound selected from the group consisting of (a) Group VB metal oxides, (b) Group VB metal phosphates, (c) silicates of Groups IIA, IIIB, IVB, VB, and the lanthanide and actinide metals, and (d) tungsten oxdies, with the proviso that the silicates and tungsten oxides are essentially free of aluminum. For example, ethylenediamine is contacted with a catalyst of niobium phosphate or niobic acid under reaction conditions to yield predominantly non-cyclic polyethylenepolyamines.
    Type: Grant
    Filed: November 9, 1990
    Date of Patent: June 2, 1992
    Assignee: The Dow Chemical Company
    Inventors: Robert G. Bowman, David C. Molzahn, George E. Hartwell
  • Patent number: 5118851
    Abstract: A process of preparing a mixture of polyalkylenepolyamines and alkanolpolyamines comprising contacting a difunctional aliphatic alcohol with a primary or secondary aliphatic amine in the presence of a metal silicate catalyst wherein the metal is selected from the group consisting of Groups IIA, IIIB, and the lanthanide and actinide metals. For example, monoethanolamine reacts with diethylenetriamine in the presence of magnesium silicate to yield a mixture of higher molecular weight linear and branched polyethylenepolyamines and their corresponding alkanolpolyamines. These product mixtures are useful in the formation of specialty polyurethanes.
    Type: Grant
    Filed: December 5, 1990
    Date of Patent: June 2, 1992
    Inventors: Robert G. Bowman, David C. Molzahn, George E. Hartwell
  • Patent number: 5073635
    Abstract: A process of preparing linearly-extended polyalkylenepolyamines, such as linear and branched polyethylenepolyamines, comprising contacting a difunctional aliphatic alcohol, such as monoethanolamine, with a reactant aliphatic amine, such as ethylenediamine, in the presence of a metal silicate catalyst wherein the metal is selected from Groups IIIB, IVB, VB and the lanthanide rare earth metals. Reactions of piperazines with alkanolamines to yield alcohol-extended and/or amine-extended piperazines are included in the process of this invention.
    Type: Grant
    Filed: June 22, 1990
    Date of Patent: December 17, 1991
    Assignee: The Dow Chemical Company
    Inventors: Robert G. Bowman, David C. Molzahn, George E. Hartwell
  • Patent number: 5030740
    Abstract: A process for preparing linearly-extended polyalkylenepolyamines, such as linear and branched polyethylenepolyamines, comprising contacting a difunctional aliphatic alcohol, such as monoethanolamine, with a reactant amine, such as ethylenediamine, in the presence of a catalyst containing tungsten oxide essentially free of the metals of Groups VIII, IB, and IIB of the Periodic Table. Included among the linearly-extended polyalkylenepolyamines are alcohol-extended piperazines, such as N-(2-hydroxyethyl)-piperazine, and amine-extended piperazines, such as N-(2-aminoethyl)piperazine.
    Type: Grant
    Filed: October 14, 1988
    Date of Patent: July 9, 1991
    Assignee: The Dow Chemical Company
    Inventors: Robert G. Bowman, David C. Molzahn, George E. Hartwell
  • Patent number: 5011999
    Abstract: A process for the preparation of predominantly non-cyclic polyalkylenepolyamines comprising contacting a difunctional aliphatic alcohol with ammonia or a primary or secondary aliphatic amine in the presence of a catalyst selected from the group consisting of Group VB metal oxides, niobium phosphates, tantalum phosphates, and mixtures thereof. For example, monoethanolamine is aminated by ethylenediamine to predominantly linear and branched polyethylenepolyamines in the presence of a catalyst containing niobium oxide supported on boehmite alumina.
    Type: Grant
    Filed: February 23, 1989
    Date of Patent: April 30, 1991
    Assignee: The Dow Chemical Company
    Inventors: Robert G. Bowman, George E. Hartwell, David C. Molzahn, Enrique G. Ramirez, John E. Lastovica, Jr.