Patents by Inventor Ajay M. Madgavkar
Ajay M. Madgavkar 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: 5104972Abstract: A process is provided comprising the steps of contacting a Group VIII metal hydrogenation catalyst residue containing polymer solution with a silicate, and recovering a polymer solution comprising less than 5 ppm by weight, based on the solution, of the Group VIII metal. In a preferred embodiment, the silicate is calcium silicate, magnesium silicate or diatomaceous earth.Type: GrantFiled: November 23, 1990Date of Patent: April 14, 1992Assignee: Shell Oil CompanyInventors: Ajay M. Madgavkar, Carma J. Gibler, David W. Daum
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Patent number: 5089541Abstract: A process is provided comprising the steps of contacting a polymer solution which contains Group VIII metal hydrogenation catalyst residue with molecular oxygen, contacting the polymer solution with activated carbon, and recovering a polymer cement comprising less than 5 ppm by weight, based on the solution of Group VIII metals.Type: GrantFiled: November 23, 1990Date of Patent: February 18, 1992Assignee: Shell Oil CompanyInventors: Ajay M. Madgavkar, David W. Daum, Carma J. Gibler
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Patent number: 4985139Abstract: A process is disclosed for the removal of basic heterocyclic nitrogen compounds from a petroleum crude oil or fraction thereof which comprises treating, the petroleum crude oil in a distillation zone to form a distillation bottoms stream which is rich in basic heterocyclic nitrogen compounds. This stream is passed without cooling or heat removal to a two-phase extraction zone with an extractant consisting essentially of an aqueous solution of a lower carboxylic acid and preferably having from 1 to 15 carbon atoms. The extractant complexes the basic heterocyclic nitrogen compound to produce a stream of petroleum crude oil or fraction thereof having a smaller content of heterocyclic nitrogen compounds and a stream comprising the lower carboxylic acid extractant with an increased quantity of basic heterocyclic nitrogen compounds. Both of these streams are passed to distillation without heating.Type: GrantFiled: July 14, 1988Date of Patent: January 15, 1991Assignee: Shell Oil CompanyInventor: Ajay M. Madgavkar
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Patent number: 4861723Abstract: The invention disclosed is for a combination of two processes to enable the clean burning of coal in a coal water mixture. First the coal is ground and then treated with a desulfurizing microorganism to desulfurize the coal. After separation the coal is formulated into a coal water admixture in requisite quantities of water to coal, and with proper inclusion of additives, is combusted in a suitable furnace equipped with a means to burn a coal-water mixture. The desulfurized coal, after treatment with a select microorganism, will contain less than 1.0 wt % pyritic (inorganic) sulfur, be low in ash content and be cleanly combustible to capture its latent heat values.Type: GrantFiled: December 15, 1986Date of Patent: August 29, 1989Assignee: Shell Oil CompanyInventor: Ajay M. Madgavkar
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Patent number: 4790930Abstract: A process is disclosed for the removal of basic heterocyclic nitrogen compounds from a petroleum crude oil or fraction thereof which comprises first treating the petroleum crude oil or fraction thereof rich in basic heterocyclic nitrogen compounds in a two-phase extraction zone with an extractant consisting essentially of an aqueous solution of a lower carboxylic acid, preferably having between 1 and 15 carbon atoms. The extractant complexes the basic heterocyclic nitrogen compounds to produce a stream of petroleum crude oil or fraction thereof having a smaller content of heterocyclic nitrogen compounds and a stream comprising the lower carboxylic acid extractant with an increased quantity of basic heterocyclic nitrogen compounds. The petroleum crude oil or fraction thereof possessing a reduced quantity of heterocyclic nitrogen compounds is hydrotreated in the presence of hydrogen and a hydrotreating catalyst to further remove the basic heterocyclic nitrogen compounds.Type: GrantFiled: May 29, 1987Date of Patent: December 13, 1988Assignee: Shell Oil CompanyInventors: Ajay M. Madgavkar, Don M. Washecheck
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Patent number: 4749472Abstract: The instant invention discloses a method of removing heterocyclic basic nitrogen compounds from petroleum oils which comprises first enhancing the concentration of the heterocyclic basic nitrogen compounds in a portion of the petroleum oil and then extracting the enhanced portion of the heterocyclic basic nitrogen compounds with a two phase system having an aliphatic carboxylic acid as the extracting agent. In the hydrotreating embodiment of this invention a portion of all of the nitrogen compounds are converted to heterocyclic basic nitrogen compounds and thereby more feasibly extracted. In the distillation embodiment of this invention the nitrogen compounds are actually concentrated and thereby result in a more feasible extraction with the aliphatic carboxylic acid.Type: GrantFiled: March 6, 1987Date of Patent: June 7, 1988Assignee: Shell Oil CompanyInventor: Ajay M. Madgavkar
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Patent number: 4671865Abstract: The instant invention discloses a method of removing heterocyclic basic nitrogen compounds from petroleum oils which comprises first enhancing the concentration of the heterocyclic basic nitrogen compounds in a portion of the petroleum oil and then extracting the enhanced portion of the heterocyclic basic nitrogen compounds with a two phase system having an aliphatic carboxylic acid as the extracting agent. In the hydrotreating embodiment of this invention a portion of all of the nitrogen compounds are converted to heterocyclic basic nitrogen compounds and thereby more feasibly extracted. In the distillation embodiment of this invention the nitrogen compounds are actually concentrated and thereby result in a more feasible extraction with the aliphatic carboxylic acid.Type: GrantFiled: September 27, 1985Date of Patent: June 9, 1987Assignee: Shell Oil CompanyInventors: Ajay M. Madgavkar, Donald M. Washecheck
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Patent number: 4454366Abstract: Spent boron trifluoride catalyst is removed from organic liquids by contacting the liquid with polyvinyl alcohol. For example, boron trifluoride catalyst is removed from 1-olefin oligomer product by passing the liquid oligomer through a bed of granular polyvinyl alcohol. The boron trifluoride is recovered from the polyvinyl alcohol and is recycled for use as a catalyst.Type: GrantFiled: December 15, 1982Date of Patent: June 12, 1984Assignee: Gulf Research & Development CompanyInventors: Roger F. Vogel, Ajay M. Madgavkar, Harold E. Swift
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Patent number: 4433197Abstract: Boron trifluoride is removed from coordination compounds contaminating organic liquids by contacting the contaminated liquid with silica. For example, boron trifluoride is removed from a boron trifluoride-n-butanol coordination compound contaminating a 1-olefin oligomer product by passing the contaminated liquid oligomer through a bed of silica.Type: GrantFiled: July 8, 1982Date of Patent: February 21, 1984Assignee: Gulf Research & Development CompanyInventors: Roger F. Vogel, Ajay M. Madgavkar, Harold E. Swift
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Patent number: 4426280Abstract: There is provided a process for reduction of the nitrogen content of shale oil. The process comprises contacting shale oil with a low acid strength solvent in a first extraction zone, followed by contacting the shale oil with a high acid strength solvent in a second extraction zone. A portion of the high acid strength solvent containing extracted nitrogen-containing and non-nitrogen-containing compounds is passed to the first extraction zone and diluted to form low acid strength solvent, and at least a portion of the non-nitrogen-containing compounds redissolve into the shale oil in contact with the low acid strength solvent and are recovered. Thus, oil recovery is maximized at high nitrogen removal.Type: GrantFiled: February 9, 1982Date of Patent: January 17, 1984Assignee: Occidental Petroleum CorporationInventors: Paul Y. Chen, Ajay M. Madgavkar
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Patent number: 4394296Abstract: A three-component catalyst is prepared comprising a particulate silica adsorbent with boron trifluoride and water adsorbed on the silica. The silica-water-boron trifluoride catalyst is used in hydrocarbon conversion reactions such as the oligomerization of 1-decene to a product predominating in the trimer and tetramer.Type: GrantFiled: August 3, 1981Date of Patent: July 19, 1983Assignee: Gulf Research & Development CompanyInventors: Ajay M. Madgavkar, Harold E. Swift
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Patent number: 4384162Abstract: Boron trifluoride contaminant is removed from organic liquids by contacting the contaminated liquid with polyvinyl alcohol. For example, boron trifluoride catalyst is removed from 1-olefin oligomer product by passing the liquid oligomer through a bed of granular polyvinyl alcohol.Type: GrantFiled: July 8, 1982Date of Patent: May 17, 1983Assignee: Gulf Research & Development CompanyInventors: Roger F. Vogel, Ajay M. Madgavkar, Harold E. Swift
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Patent number: 4382912Abstract: Hydrogen sulfide is selectively oxidized in a gas stream containing at least 20 mol percent a carbon dioxide using an iron catalyst, preferably Fe.sub.2 O.sub.3 supported on a ceramic honeycomb support.Type: GrantFiled: September 10, 1981Date of Patent: May 10, 1983Assignee: Gulf Research & Development CompanyInventors: Ajay M. Madgavkar, Harold E. Swift
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Patent number: 4381641Abstract: The combustible component of a gas stream of low heating value is combusted using less than a stoichiometric amount of oxygen under conditions for the suppression of carbon monoxide including the presence of an oxidation catalyst and a small amount of arsine, and the heat energy in the combusted gas is utilized, for example, by expansion in a gas turbine.Type: GrantFiled: June 23, 1980Date of Patent: May 3, 1983Assignee: Gulf Research & Development CompanyInventors: Ajay M. Madgavkar, Harold E. Swift
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Patent number: 4378048Abstract: Low heating value gases are combusted substoichiometrically in two combustion zones in series in contact with two different supported platinum catalysts in which the concentration of platinum in the catalyst in the first zone is higher than the concentration of platinum in the second catalyst. The combusted gas of reduced carbon monoxide can be directly vented to the atmosphere after energy has been extruded from it for a useful purpose.Type: GrantFiled: May 8, 1981Date of Patent: March 29, 1983Assignee: Gulf Research & Development CompanyInventors: Ajay M. Madgavkar, Harold E. Swift
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Patent number: 4366668Abstract: The combustible component of a stream of low heating value gas comprising carbon monoxide, hydrogen and methane is combusted using less than a stoichiometric amount of air in the presence of an oxygenation catalyst and the heat energy in the combusted gas is utilized, for example, by expansion in a gas turbine.Type: GrantFiled: February 25, 1981Date of Patent: January 4, 1983Assignee: Gulf Research & Development CompanyInventors: Ajay M. Madgavkar, Roger F. Vogel, Harold E. Swift
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Patent number: 4363361Abstract: The combustible component of a gas stream of low heating value is combusted using less than a stoichiometric amount of oxygen with minor production of carbon monoxide due to the use of an oxygenation catalyst comprising at least three metals in a perovskite-type crystal structure. This combusted gas can be directly vented to the atmosphere after energy has been extracted from it for a useful purpose.Type: GrantFiled: March 19, 1981Date of Patent: December 14, 1982Assignee: Gulf Research & Development CompanyInventors: Ajay M. Madgavkar, Roger F. Vogel
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Patent number: 4308414Abstract: An alpha-olefin is oligomerized in the presence of a three-component catalyst comprising a particulate solid adsorbent having boron trifluoride and water adsorbed on the solid adsorbent. For example, 1-decene is oligomerized to a product predominating in the trimer and tetramer using silica as the solid adsorbent.Type: GrantFiled: December 17, 1979Date of Patent: December 29, 1981Assignee: Gulf Research & Development CompanyInventors: Ajay M. Madgavkar, Harold E. Swift
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Patent number: 4299086Abstract: The combustible component of a gas stream of low heating value is combusted using less than a stoichiometric amount of oxygen in the presence of an oxygenation catalyst and the heat energy in the combusted gas is utilized, for example, by expansion in a gas turbine.Type: GrantFiled: December 7, 1978Date of Patent: November 10, 1981Assignee: Gulf Research & Development CompanyInventors: Ajay M. Madgavkar, Roger F. Vogel, Harold E. Swift
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Patent number: 4273188Abstract: An integrated in situ combustion process for recovering subterranean liquid and solid carbonaceous deposits in which the resulting flue gas of low heating value is combusted at substoichiometric conditions over two different oxidation catalysts in two combustion zones in series and is expanded in a gas turbine which drives the air compressor for injecting the combustion air into the underground carbonaceous deposit. One of the oxidation catalysts comprising platinum and at least one metal cocatalyst selected from Groups IIA and VIIB, Group VIII up through atomic No. 45, the lanthanides, chromium, zinc, silver, tin and antimony is provided to reduce the carbon monoxide in the combusted flue gas.Type: GrantFiled: April 30, 1980Date of Patent: June 16, 1981Assignee: Gulf Research & Development CompanyInventors: Roger F. Vogel, Ajay M. Madgavkar, Harold E. Swift