Patents by Inventor Gamini A. Vedage
Gamini A. Vedage 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: 20070259773Abstract: The present invention provides trimerization catalyst compositions and methods to produce a polyisocyanurate/polyurethane foam using such trimerization catalyst compositions. The catalyst composition is the contact product of at least one ?,?-unsaturated carboxylate salt and at least one second carboxylate salt.Type: ApplicationFiled: May 4, 2006Publication date: November 8, 2007Inventors: Juan Burdeniuc, Torsten Panitzsch, John Dewhurst, Gamini Vedage
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Publication number: 20070066849Abstract: The present invention relates to processes for the catalytic hydrogenation of aromatic amines to their acyclic counterparts using a ruthenium catalyst on a lithium aluminate support. The hydrogenation process comprises contacting an aromatic amine with hydrogen in the presence of a ruthenium catalyst under temperature and pressure conditions suitable to effect ring hydrogenation. The process is especially useful for hydrogenating aniline to cyclohexylamine.Type: ApplicationFiled: September 22, 2005Publication date: March 22, 2007Inventors: Gamini Vedage, Hao Ding, Matthew Engel, Eugene Lutz, Lenore Emig
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Publication number: 20060047173Abstract: The invention is directed to an improvement in a catalytic process for the ring hydrogenation of a methylenedianiline feedstock, including crude methylenedianiline. One component of the improvement is a pretreatment process which resides in passing the crude methylenedianiline feedstock over a ruthenium catalyst carried on a fixed bed support, cooling without venting, and then hydrogenation of the pretreated crude methylenedianiline feedstock over a rhodium catalyst or a mixed Rh/Ru catalyst carried on a monolith support and carrying out the ring hydrogenation in a batch reaction. Another component in the improvement is the employment of a catalyst comprised of rhodium and ruthenium carried on a monolith support.Type: ApplicationFiled: August 24, 2004Publication date: March 2, 2006Inventors: Hao Ding, Anthony Cartolano, Vipul Dholakia, Gamini Vedage
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Publication number: 20050261525Abstract: This invention relates to a process for the catalytic hydrogenation of impurity laden methylenedianiline feedstocks commonly referred to a MDA-50 and MDA-60. The process for hydrogenating methylenedianiline containing at least 40% oligomer function by weight comprises: contacting the feedstock with hydrogen in the presence of a rhodium/ruthenium containing catalyst system carried on a lithium aluminate support under conditions for effecting ring hydrogenation.Type: ApplicationFiled: May 19, 2004Publication date: November 24, 2005Inventors: Hao Ding, Gamini Vedage, William Martine, Vipul Dholakia
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Publication number: 20050054872Abstract: This invention relates to an improved hydrogenation process for the preparation of etheramines. In the process, cyanoethylated alcohols, i.e., the reaction product of an alcohol with (meth)acrylonitrile, are contacted with hydrogen in the presence of a sponge cobalt catalyst. The improvement in the process resides in effecting the hydrogenation process utilizing a cyanoethylated alcohol feedstock contaminated with byproduct acrylonitrile and utilizing a solvent that solubilizes byproduct (meth)acrylonitrile present in the feedstock. Specific classes of solvents employed are ethers and amides.Type: ApplicationFiled: September 4, 2003Publication date: March 10, 2005Inventors: Gamini Vedage, Eugene Lutz, Matthew Engel
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Publication number: 20050033091Abstract: A method for converting amino ether alcohols to amino ether amines by amination in the vapor phase with a catalyst comprising copper and zinc. The catalyst may also comprise an alkali, alkaline earth, or lanthanide element as a promoter.Type: ApplicationFiled: August 4, 2003Publication date: February 10, 2005Inventors: John Mitchell, Richard Underwood, Michael Ford, Gamini Vedage, Hong-Xin Li
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Patent number: 5574189Abstract: This invention relates to an improvement in a process for the production of amines and particularly secondary amines by the hydrogenation of aliphatic and aromatic nitriles. The improvement resides in the use of a multi-metallic catalyst, preferably a bimetallic catalyst comprising nickel or cobalt in combination with rhodium, ruthenium or palladium. Optionally, the catalyst is carried on an alumina support.Type: GrantFiled: February 2, 1995Date of Patent: November 12, 1996Assignee: Air Products and Chemicals, Inc.Inventors: Gamini A. Vedage, John N. Armor
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Patent number: 5567847Abstract: This invention relates to an improvement in a process for the production of amines and particularly secondary amines by the hydrogenation of aliphatic and aromatic nitriles and disproportionation of the resulting primary amine containing feedstock. The improvement resides in the use of a bimetallic catalyst comprising nickel or cobalt in combination with rhodium, ruthenium or palladium platinum. Optionally, the catalyst is carried on an alumina support.Type: GrantFiled: February 21, 1995Date of Patent: October 22, 1996Assignee: Air Products and Chemicals, Inc.Inventors: Gamini A. Vedage, John N. Armor
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Patent number: 5545756Abstract: This invention relates to an improved hydrogenation process wherein aromatic amines are hydrogenated to their ring hydrogenated counterparts using an improved rhodium catalyst. The aromatic amines are represented by the formulas: ##STR1## wherein R is hydrogen or C.sub.1-6 aliphatic, R.sub.1 and R.sub.2 are hydrogen or C.sub.1-6 aliphatic, A is C.sub.1-4 alkyl, n is 0 or 1, x is 1-3 and y is 1 to 2 except the sum of the y groups in Formula I excluding A may be 1.The rhodium catalyst is carried on a support selected from the group consisting of TiAl.sub.2 O.sub.5, TiSrO.sub.3 and TiSiO.sub.4.Type: GrantFiled: September 14, 1994Date of Patent: August 13, 1996Assignee: Air Products and Chemicals, Inc.Inventors: Gamini A. Vedage, John N. Armor
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Patent number: 5444170Abstract: This invention pertains to an improved process for the hydrogenation of acetylenic compounds prepared by the condensation of ketones or aldehydes with acetylene wherein the acetylenic compounds are contacted with hydrogen in the presence of a hydrogenation catalyst under conditions for effecting hydrogenation. The improvement in the process resides in utilizing a novel cocatalyst system for hydrogenating the acetylenic compounds to paraffins. The cocatalyst converts the inhibiting impurity in the feed to a noninhibiting species and comprises palladium and platinum, typically in a ratio of from 1 to 40 weight parts palladium per weight part platinum.Type: GrantFiled: January 10, 1994Date of Patent: August 22, 1995Assignee: Air Products and Chemicals, Inc.Inventor: Gamini A. Vedage
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Patent number: 5360934Abstract: This invention relates to an improved hydrogenation process wherein aromatic amines are hydrogenated to their ring hydrogenated counterparts. These aromatic amines are presented by the formulas: ##STR1## wherein R is hydrogen or C.sub.1-6 aliphatic, R1 and R2 are hydrogen or C.sub.1-6 aliphatic, A is C.sub.1-4 or NH; n is 0-2, x is 1-3 and y is 1 to 2 except the sum of the y groups in Formula I may be 1. The improvement resides in the utilization of a catalyst comprising rhodium carried on a support of kappa, theta or delta alumina.Type: GrantFiled: June 25, 1993Date of Patent: November 1, 1994Assignee: Air Products and Chemicals, Inc.Inventors: Gamini A. Vedage, John N. Armor
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Patent number: 5288424Abstract: This invention pertains to alkyl substituted bi(cyclohexylamine) and derivatives having a high trans, trans-isomer distribution. This isomer distribution represents a thermodynamic mixture of the isomers and provides for extended pot life and extended thermal properties in epoxy resins which are not seen with the kinetic isomer mixture. The bridged cyclohexylamine and derivatives are represented by the formula: ##STR1## wherein; R.sup.1 is hydrogen or C.sub.1-4 alkyl;R.sup.2 is C.sub.1-4 alkyl; andR.sup.3 is hydrogen or C.sub.1-4 alkylThe invention also relates to epoxy resins cured with the bridged bi(cyclohexylamines).Type: GrantFiled: July 15, 1993Date of Patent: February 22, 1994Assignee: Air Products and Chemicals, Inc.Inventors: Peter A. Lucas, Gamini A. Vedage, Jeremiah P. Casey
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Patent number: 5264501Abstract: This invention pertains to alkyl substituted bi(cyclohexylamine) and derivatives having a high trans,trans-isomer distribution. This isomer distribution represents a thermodynamic mixture of the isomers and provides for extended pot life and extended thermal properties in epoxy resins which are not seen with the kinetic isomer mixture. The bridged cyclohexylamine and derivatives are represented by the formula: ##STR1## wherein; R.sup.1 is hydrogen or C.sub.1-4 alkyl;R.sup.2 is C.sub.1-4 alkyl; andR.sup.3 is hydrogen or C.sub.1-4 alkylThe invention also relates to epoxy resins cured with the bridged bi(cyclohexylamines).Type: GrantFiled: August 9, 1991Date of Patent: November 23, 1993Assignee: Air Products and Chemicals, Inc.Inventors: Peter A. Lucas, Gamini A. Vedage, Jeremiah P. Casey
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Patent number: 5196587Abstract: This invention relates to an improved process for the catalytic hydrogenation of methylene bridged polyphenylamines using rhodium as th e catalyst to produce the methylene bridged polycyclohexylamine counterparts. The improvement for hydrogenating crude methylene bridged polyphenylamines containing polyphenylamine oligomers and trace amounts of impurities, such as the formamide of the methylene bridged polyphenylamines, comprises contacting the crude polyphenylamine feed with a hydrogenation catalyst, other than rhodium, and one which is not a catalyst poison to rhodium, under conditions sufficient to at least partially hydrogenate the polyphenylamine mixture and then effecting hydrogenation of the methylene bridged polyphenylamine to the polycyclohexylamine counterpart in the presence of a rhodium catalyst.Type: GrantFiled: May 13, 1991Date of Patent: March 23, 1993Assignee: Air Products and Chemicals, Inc.Inventors: Gamini A. Vedage, William W. Henderson, Bernard A. Toseland
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Patent number: 5026914Abstract: This invention relates to an improved hydrogenation process wherein aromatic amines are hydrogenated to their ring hydrogenated counterparts using an improved rhodium catalyst and to the catalyst. The aromatic amines are represented by the formulas: ##STR1## wherein R is hydrogen or C.sub.1-6 aliphatic, R.sub.1 and R.sub.2 are hydrogen or C.sub.1-6 aliphatic, A is C.sub.1-4 alkylene, NH, or ##STR2## n is 0-2, x is 1-3 and y is 1 to 2 except the sum of the y groups in Formula I excluding A may be 1.The rhodium catalyst is supported on titania bonded to silica or zirconia or bonded with silica, zirconia or titania from a sol or zirconia bonded with silica or alumina. The resulting catalyst has greater activity and attrition resistance. Zirconia bonded with silica or alumina also results in a catalyst with increased attrition resistance.Type: GrantFiled: April 11, 1989Date of Patent: June 25, 1991Assignee: Air Products and Chemicals, Inc.Inventors: Richard J. Jenkins, Robert A. Treskot, Gamini A. Vedage, James F. White
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Patent number: 4960941Abstract: This invention relates to an improved hydrogenation process wherein aromatic amines are hydrogenated to their ring hydrogenated counterparts. These aromatic amines are presented by the formulas: ##STR1## wherein R is hydrogen or C.sub.1-6 aliphatic, R.sub.1 and R.sub.2 are hydrogen or C.sub.1-6 aliphatic, A is C.sub.1-4, NH or ##STR2## n is 0-2, x is 1-3 and y is 1 to 2 except the sum of the y groups in Formula I excluding A may be 1.The improvement resides in the use of a rhodium catalyst carried on titania support.Type: GrantFiled: March 30, 1988Date of Patent: October 2, 1990Assignee: Air Products and Chemicals, Inc.Inventors: Gamini A. Vedage, William W. Henderson, Bernard A. Toseland, Michel Deeba
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Patent number: 4766247Abstract: The present invention relates to a process for the reduction of the color of polyamines by reacting at elevated temperature, i.e. 50.degree. to 175.degree. C., and pressure, i.e. 50 to 1500 psig, such colored polyamines, e.g. triethylenetetramine or tetraethylenepentamine, in the presence of a hydrogenation catalyst, e.g. Raney nickel or palladium on carbon, and a hydrogen atmosphere for a period of time sufficient to effectuate the desired reduction in color. In the process of the present invention, the polyamines can either be distilled into a narrow product composition and then hydrogenated or a crude polyamine product can be hydrogenated and then distilled to produce the desired product composition.Type: GrantFiled: September 26, 1986Date of Patent: August 23, 1988Assignee: Air Products and Chemicals, Inc.Inventors: Michael E. Ford, Thomas A. Johnson, Gamini A. Vedage
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Patent number: 4642381Abstract: This invention relates to an improved catalyst and method for the selective production of methylamines. More particularly, it is concerned with the preparation of stable highly active catalysts for producing methylamines by a catalytic reaction of ammonia or substituted amines and binary synthesis gas (CO+H.sub.2).Type: GrantFiled: November 28, 1983Date of Patent: February 10, 1987Assignee: Lehigh UniversityInventors: Kamil Klier, Richard G. Herman, Gamini A. Vedage
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Patent number: 4480131Abstract: A primary alkyl amine and an alcohol of up to 12 carbon atoms are reacted at low temperature (50.degree.-250.degree. C.) over specific catalysts (alkali-treated catalysts generally or binary Cu/ZnO and Pd/SiO.sub.2 systems, with or without alkali treatment) to produce, with good selectivity, secondary and tertiary alkylamines of the general formula, R.sub.1 N(R.sub.2).sub.2, wherein R.sub.1 is a lower alkyl or an aryl group, and R.sub.2 is hydrogen or another lower alkyl or aryl group, with at least one of R.sub.2 's being an alkyl or aryl group.Type: GrantFiled: June 1, 1983Date of Patent: October 30, 1984Assignee: Lehigh UniversityInventors: Kamil Klier, Richard G. Herman, Gamini A. Vedage