Patents by Inventor Raghunath V Chaudhari
Raghunath V Chaudhari 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: 10821422Abstract: In a first aspect, the present invention is directed to a process for forming a metal alloy catalyst. Another aspect of the present invention is directed to a process for oxidizing a substrate that includes contacting a substrate with an oxidant in the presence of a metal alloy catalyst to form one or more carboxylic acids. Suitable substrates include sugars, polyols, furfural alcohols, and polyhydroxycarboxylic acids. The oxidation process may use the alloy catalyst formed from the process of the first aspect of the invention.Type: GrantFiled: November 17, 2016Date of Patent: November 3, 2020Assignee: UNIVERSITY OF KANSASInventors: Raghunath V. Chaudhari, Xin Jin, Bala Subramaniam
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Publication number: 20190308175Abstract: In a first aspect, the present invention is directed to a process for forming a metal alloy catalyst. Another aspect of the present invention is directed to a process for oxidizing a substrate that includes contacting a substrate with an oxidant in the presence of a metal alloy catalyst to form one or more carboxylic acids. Suitable substrates include sugars, polyols, furfural alcohols, and polyhydroxycarboxylic acids. The oxidation process may use the alloy catalyst formed from the process of the first aspect of the invention.Type: ApplicationFiled: November 17, 2016Publication date: October 10, 2019Inventors: RAGHUNATH V. CHAUDHARI, XIN JIN, BALA SUBRAMANIAM
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Patent number: 9994601Abstract: Provided is a process for depolymerizing lignin, the process comprising exposing a liquid feed comprising lignin and a solvent to a metal-incorporated solid mesoporous silicate catalyst under conditions sufficient to depolymerize the lignin to produce one or more aromatic monomers.Type: GrantFiled: November 18, 2016Date of Patent: June 12, 2018Assignee: University of KansasInventors: Bala Subramaniam, Anand Ramanathan, Kakasaheb Y. Nandiwale, Andrew M. Danby, Raghunath V. Chaudhari
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Publication number: 20170145043Abstract: Provided is a process for depolymerizing lignin, the process comprising exposing a liquid feed comprising lignin and a solvent to a metal-incorporated solid mesoporous silicate catalyst under conditions sufficient to depolymerize the lignin to produce one or more aromatic monomers.Type: ApplicationFiled: November 18, 2016Publication date: May 25, 2017Inventors: Bala Subramaniam, Anand Ramanathan, Kakasaheb Y. Nandiwale, Andrew M. Danby, Raghunath V. Chaudhari
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Patent number: 9085521Abstract: A process for producing lactic acid from glycerol using a reaction mixture comprising glycerol, a dehydrogenation catalyst (preferably a copper-based catalyst), an alkaline component, and water.Type: GrantFiled: March 28, 2012Date of Patent: July 21, 2015Assignee: UNIVERSITY OF KANSASInventors: Raghunath V. Chaudhari, Bala Subramaniam, Debdut S. Roy
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Patent number: 8822734Abstract: Allyl alcohol, particularly from biobased sources such as glycerol, is hydroformylated to products including 4-hydroxybutyraldehyde and 4-hydroxy-2-methylpropionaldehyde by forming a homogeneous reaction mixture including allyl alcohol, a rhodium-based hydroformylation catalyst and a near critical liquefiable petroleum gas or mixture of such gases, reacting the near critical liquefiable petroleum gas (or gas mixture)-expanded allyl alcohol substrate with carbon monoxide and with hydrogen in the presence of the catalyst, and recovering substantially all of the petroleum gas or gases overhead by reducing the pressure and degassing the product mixture. Dense propane is especially useful as a single inert solvent/diluent, and substantially no other solvent/diluent is needed.Type: GrantFiled: February 14, 2012Date of Patent: September 2, 2014Assignee: The University of KansasInventors: Bala Subramaniam, Raghunath V. Chaudhari, Bibhas Sarkar
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Publication number: 20140081050Abstract: Allyl alcohol, particularly from biobased sources such as glycerol, is hydroformylated to products including 4-hydroxybutyraldehyde and 4-hydroxy-2-methylpropionaldehyde by forming a homogeneous reaction mixture including allyl alcohol, a rhodium-based hydroformylation catalyst and a near critical liquefiable petroleum gas or mixture of such gases, reacting the near critical liquefiable petroleum gas (or gas mixture)-expanded allyl alcohol substrate with carbon monoxide and with hydrogen in the presence of the catalyst, and recovering substantially all of the petroleum gas or gases overhead by reducing the pressure and degassing the product mixture. Dense propane is especially useful as a single inert solvent/diluent, and substantially no other solvent/diluent is needed.Type: ApplicationFiled: February 14, 2012Publication date: March 20, 2014Applicant: THE UNIVERSITY OF KANSASInventors: Bala Subramaniam, Raghunath V. Chaudhari, Bibhas R. Sarkar
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Patent number: 8415511Abstract: A catalyst composition/system can include: a platinum catalyst metal (Pt) and/or rhenium catalyst metal (Re) on a first support; and a ruthenium catalyst metal (Ru) and/or rhenium catalyst metal (Re) on a second support or a platinum catalyst metal (Pt) and a ruthenium catalyst metal (Ru) and/or a rhenium catalyst metal (Re) on the same support. The Pt:Ru, Re:Pt and/or Re:Ru weight ratio can be between about 1:4 and about 4:1. The support can be alumina, carbon, silica, a zeolite, TiO2, ZrO2 or another suitable material. The first and second support can be on the same support structure or on different support structures. In one option, the first and second supports can be positioned such that the Pt and/or Re are capable of catalyzing a dehydrogenation and/or reforming reaction that produces hydrogen and the Ru and/or Re are capable of catalyzing a hydrogenolysis reaction.Type: GrantFiled: June 8, 2010Date of Patent: April 9, 2013Assignee: University of KansasInventors: Raghunath V. Chaudhari, Debdut S. Roy, Bala Subramaniam
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Publication number: 20120253067Abstract: A process for producing lactic acid from glycerol using a reaction mixture comprising glycerol, a dehydrogenation catalyst (preferably a copper-based catalyst), an alkaline component, and water.Type: ApplicationFiled: March 28, 2012Publication date: October 4, 2012Inventors: Raghunath V. Chaudhari, Bala Subramaniam, Debdut S. Roy
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Patent number: 8252963Abstract: A catalyst composition can include: a support; a ruthenium catalyst (Ru) nanoparticle; and a linker linking the Ru nanoparticle to the support, wherein the linker is stable under hydrogenolysis conditions. In one aspect, the linker can include 3-aminopropyl trimethoxysilane (APTS) or derivatives thereof, such as those with amine functionality. In another aspect, the linker can include phosphotungstic acid (PTA) or other similar solid acid agents. In another aspect, the support can be selected from alumina, carbon, silica, a zeolite, TiO2, ZrO2, or another suitable material. A specific example of a support includes zeolite, such as a NaY zeolite. The Ru nanoparticle can have a size range from about 1 nm to about 25 nm, and can be obtained by reduction of Ru salts.Type: GrantFiled: June 9, 2010Date of Patent: August 28, 2012Assignee: University of KansasInventors: Raghunath V. Chaudhari, Debdut S. Roy, Bala Subramaniam
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Publication number: 20110028773Abstract: A process for the complete deoxygenation of an oxygenate, especially those from bio-oils comprises forming a reaction mixture comprising the oxygenate, molecular hydrogen, and a hydrodeoxygenation catalyst in a solvent. The reaction mixture is maintained at a temperature that is 0.7 to 1.3 times the solvent critical temperature in absolute temperature units (K). Complete deoxygenation occurs via a hydrodeoxygenation pathway and a decarbonylation pathway.Type: ApplicationFiled: July 29, 2010Publication date: February 3, 2011Inventors: Bala Subramaniam, Jackson W. Ford, Raghunath V. Chaudhari
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Publication number: 20110004029Abstract: A catalyst composition/system can include: a platinum catalyst metal (Pt) and/or rhenium catalyst metal (Re) on a first support; and a ruthenium catalyst metal (Ru) and/or rhenium catalyst metal (Re) on a second support or a platinum catalyst metal (Pt) and a ruthenium catalyst metal (Ru) and/or a rhenium catalyst metal (Re) on the same support. The Pt:Ru, Re:Pt and/or Re:Ru weight ratio can be between about 1:4 and about 4:1. The support can be alumina, carbon, silica, a zeolite, TiO2, ZrO2 or another suitable material. The first and second support can be on the same support structure or on different support structures. In one option, the first and second supports can be positioned such that the Pt and/or Re are capable of catalyzing a dehydrogenation and/or reforming reaction that produces hydrogen and the Ru and/or Re are capable of catalyzing a hydrogenolysis reaction.Type: ApplicationFiled: June 8, 2010Publication date: January 6, 2011Inventors: Raghunath V. Chaudhari, Debdut S. Roy, Bala Subramaniam
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Publication number: 20100317901Abstract: A catalyst composition can include: a support; a ruthenium catalyst (Ru) nanoparticle; and a linker linking the Ru nanoparticle to the support, wherein the linker is stable under hydrogenolysis conditions. In one aspect, the linker can include 3-aminopropyl trimethoxysilane (APTS) or derivatives thereof, such as those with amine functionality. In another aspect, the linker can include phosphotungstic acid (PTA) or other similar solid acid agents. In another aspect, the support can be selected from alumina, carbon, silica, a zeolite, TiO2, ZrO2, or another suitable material. A specific example of a support includes zeolite, such as a NaY zeolite. The Ru nanoparticle can have a size range from about 1 nm to about 25 nm, and can be obtained by reduction of Ru salts.Type: ApplicationFiled: June 9, 2010Publication date: December 16, 2010Inventors: Raghunath V. Chaudhari, Debdut S. Roy, Bala Subramaniam
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Patent number: 7141702Abstract: The present invention provides an improved process for the synthesis of ?-substituted acroleins from olefins by a tandem hydroformylation and Mannich reaction sequence in the presence of syngas and formaldehyde, wherein the two catalysts are segregated into two different phases thereby preventing deactivation of the catalysts by each other, and yielding a highly selective and active catalyst.Type: GrantFiled: March 26, 2004Date of Patent: November 28, 2006Assignee: Council of Scientific and Industrial ResearchInventors: Raj M. Deshpande, Makarand M. Diwakar, Raghunath V. Chaudhari
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Patent number: 6380426Abstract: The present invention relates to a process for the preparation of a carboxylic acid by carbonylating the corresponding alcohol in carbon monoxide atmosphere and in the presence of water, a solvent, a palladium catalyst and a promoter system consisting of an organic or inorganic halide and an organic sulphonic acid, at a temperature in the range of 50-250° C., at a pressure in the range of 50-2000 psig for 1 to 10 hours, the concentration of the catalyst being one mole of catalyst per every 50-50000 moles of the alcohol, the amount of the organic or inorganic halide being in the range of 5-500 moles per mole of the catalyst, and the amount of the organic sulphonic acid being in the range of 5-500 moles per mole of the catalyst, collecting the resulting product.Type: GrantFiled: September 26, 2001Date of Patent: April 30, 2002Assignee: Council of Scientific and Industrial ResearchInventors: Ashutosh A Kelkar, Sunil S Tonde, Raghunath V Chaudhari
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Patent number: 6093847Abstract: The present invention relates to an process for the preparation of ibuprofen, which comprises reacting para isobutyl phenylethanol (p-IBPE), a halide source, a protonic acid, water and the catalyst which is a compound having formula 1 which is shown herebelow: ##STR1## Wherein M = a group VIII metal specifically palladium or platinum,R.sub.1, R.sub.2, R.sub.3 = substituents on the phosphine ligand such as hydrogen, alkyl, aryl, arylalkyl cycloaliphatic,X = groups such as aryl or alkyl sulphonato or aryl or alkyl carboxylato ort formato or halides such as CI.sup.-, Br.sup.-, I.sup.-, ##STR2## = a semilabile anionic chelating ligand containing a donor and an O.sup.Type: GrantFiled: March 31, 1999Date of Patent: July 25, 2000Assignee: Council of Scientific and Industrial ResearchInventors: Raghunath V. Chaudhari, Seayad A. Majeed, Jayasree Seayad
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Patent number: 6069253Abstract: The present invention relates to novel group VIII transition metal complexes represented by the formula (I) as: ##STR1## wherein M is the central transition metal; represents a semilabile anionic chelating ligand; R.sub.1, R.sub.2 & R.sub.3 are substituents on the phosphine ligand, X is chosen from sulphonato, carboxylato, formato group or halides and 1<n<10. The invention also provides a process for the preparation of said transition metal complex.Type: GrantFiled: March 31, 1999Date of Patent: May 30, 2000Assignee: Council of Scientific and Industrial ResearchInventors: Raghunath V. Chaudhari, Jayasree Seayad, Seayad A. Majeed
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Patent number: 5502241Abstract: The invention relates to an efficient process for the preparation of methyl methyl carbamate by reacting methyl amine or N,N'-dimethyl urea with carbon monoxide, an oxidizing agent and a monoalcohol in the presence of a catalyst system including(i) a precursor selected from the group consisting of platinum group metals and soluble compounds of platinum group metals, and (ii) a promoter comprising at least one halogen containing compound selected from the group consisting of alkali metal halides, alkaline earth metal halides, quaternary ammonium halides, oxo acids of halogen atoms and their salts, and complex compounds containing halogen ions, organic halides and halogen molecules.Type: GrantFiled: September 16, 1994Date of Patent: March 26, 1996Assignee: Council of Scientific & Industrial ResearchInventors: Raghunath V. Chaudhari, Sunil P. Gupte, Ashutosh A. Kelkar, Devidas S. Kolhe, deceased
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Patent number: 5498801Abstract: A process is effected using water soluble metal complex catalysts in the presence of a promoter in the organic (water immiscible) phase. The process results in the enhancement of the rate of hydroformylation by interfacial catalysis induced by the presence of a ligand (promoter) in a catalyst immiscible phase. The reaction comprises of two phases viz - organic phase and aqueous phase. The organic phase consists of an olefin and P- containing water insoluble ligand with or without water immiscible solvent. The aqueous phase consists of a metal complex catalyst comprising of group VIII element such as Rh, Ru, Ir or Co and a water soluble ligand.Type: GrantFiled: December 30, 1994Date of Patent: March 12, 1996Assignee: Council of Scientific & Industrial InterestInventors: Raghunath V. Chaudhari, Bhalchandra M. Bhanage, Sunil S. Divekar, Raj M. Deshpande
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Patent number: 4902659Abstract: The present invention provides a process for the preparation of an improved nickel-containing catalyst suitable for the conversion of alcohols to the corresponding carboxylic acid which involves combining a nickel compound, an N-containing organic compound and an iodine promoter, bringing the combination in contact with an alcohol in the presence of carbon monoxide and subjecting the mixture to a temperature and pressure sufficient to initiate carbonylation of the alcohol. The process is characterized in that the N-containing organic compound is isoquinoline or a derivative thereof.Type: GrantFiled: July 12, 1988Date of Patent: February 20, 1990Assignee: Council of Scientific and Industrial ResearchInventors: Ashutosh A. Kelkar, Rengaswamy Jaganathan, Devidas S. Kolhe, Raghunath V. Chaudhari