Patents by Inventor Indira Jayaweera
Indira Jayaweera 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: 9321015Abstract: The invention provides methods for preparing an asymmetric hollow fiber, the asymmetric hollow fibers prepared by such methods, and uses of the asymmetric hollow fibers. One method involves passing a polymeric solution through an outer annular orifice of a tube-in-orifice spinneret, passing a bore fluid though an inner tube of the spinneret, dropping the polymeric solution and bore fluid through an atmosphere over a dropping distance, and quenching the polymeric solution and bore fluid in a bath to form an asymmetric hollow fiber.Type: GrantFiled: February 26, 2014Date of Patent: April 26, 2016Assignee: SRI INTERNATIONALInventors: Indira Jayaweera, Gopala N. Krishnan, Angel Sanjurjo, Palitha Jayaweera, Srinivas Bhamidi
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Publication number: 20140175007Abstract: The invention provides methods for preparing an asymmetric hollow fiber, the asymmetric hollow fibers prepared by such methods, and uses of the asymmetric hollow fibers. One method involves passing a polymeric solution through an outer annular orifice of a tube-in-orifice spinneret, passing a bore fluid though an inner tube of the spinneret, dropping the polymeric solution and bore fluid through an atmosphere over a dropping distance, and quenching the polymeric solution and bore fluid in a bath to form an asymmetric hollow fiber.Type: ApplicationFiled: February 26, 2014Publication date: June 26, 2014Applicant: SRI INTERNATIONALInventors: Indira Jayaweera, Gopala N. Krishnan, Angel Sanjurjo, Palitha Jayaweera, Srinivas Bhamidi
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Patent number: 8758493Abstract: A method and system for reducing an amount of ammonia in a flue gas stream. The system 100 includes: a wash vessel 180 for receiving an ammonia-containing flue gas stream 170, the wash vessel 180 including a first absorption stage 181a and a second absorption stage 181b, each of the first absorption stage 181a and the second absorption stage 181b having a mass transfer device 184; and a liquid 187 introduced to the wash vessel 180, the liquid 187 for absorbing ammonia from the ammonia-containing flue gas stream 170 thereby forming an ammonia-rich liquid 192 and a reduced ammonia containing flue gas stream 190 exiting the wash vessel 180.Type: GrantFiled: November 9, 2010Date of Patent: June 24, 2014Assignee: ALSTOM Technology LtdInventors: Eli Gal, Indira Jayaweera
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Patent number: 8168149Abstract: A method and system for CO2 capture from flue gas uses an absorber vessel in which a flue gas stream containing CO2 is contacted with an ammoniated solution to remove CO2 from the flue gas, and a regenerator vessel in which CO2 is released from the ammoniated solution. Parasitic energy consumption of the system can be reduced by adding to the ammoniated solution a promoter effective to enhance the formation of ammonium bicarbonate within the ammoniated solution. The amount of ammoniated solution recycled from the regenerator vessel to the absorber vessel is less than that which would be required using the ammoniated solution without the promoter for removal of the same amount of CO2 from the flue gas.Type: GrantFiled: December 2, 2010Date of Patent: May 1, 2012Assignee: ALSTOM Technology LtdInventors: Eli Gal, Otto Morten Bade, Indira Jayaweera, Gopala Krishnan
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Publication number: 20110070136Abstract: A method and system for CO2 capture from flue gas uses an absorber vessel in which a flue gas stream containing CO2 is contacted with an ammoniated solution to remove CO2 from the flue gas, and a regenerator vessel in which CO2 is released from the ammoniated solution. Parasitic energy consumption of the system can be reduced by adding to the ammoniated solution a promoter effective to enhance the formation of ammonium bicarbonate within the ammoniated solution. The amount of ammoniated solution recycled from the regenerator vessel to the absorber vessel is less than that which would be required using the ammoniated solution without the promoter for removal of the same amount of CO2 from the flue gas.Type: ApplicationFiled: December 2, 2010Publication date: March 24, 2011Applicant: ALSTOM Technology LtdInventors: Eli Gal, Otto Morten Bade, Indira Jayaweera, Gopala Krishnan
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Publication number: 20110048239Abstract: A method and system for reducing an amount of ammonia in a flue gas stream. The system 100 includes: a wash vessel 180 for receiving an ammonia-containing flue gas stream 170, the wash vessel 180 including a first absorption stage 181a and a second absorption stage 181b, each of the first absorption stage 181a and the second absorption stage 181b having a mass transfer device 184; and a liquid 187 introduced to the wash vessel 180, the liquid 187 for absorbing ammonia from the ammonia-containing flue gas stream 170 thereby forming an ammonia-rich liquid 192 and a reduced ammonia containing flue gas stream 190 exiting the wash vessel 180.Type: ApplicationFiled: November 9, 2010Publication date: March 3, 2011Applicant: ALSTOM Technology Ltd.Inventors: Eli Gal, Indira Jayaweera
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Patent number: 7862788Abstract: A chilled ammonia based CO2 capture system and method is provided. A promoter is used to help accelerate certain capture reactions that occur substantially coincident to and/or as a result of contacting a chilled ammonia based ionic solution with a gas stream that contains CO2.Type: GrantFiled: November 18, 2008Date of Patent: January 4, 2011Assignee: ALSTOM Technology LtdInventors: Eli Gal, Otto Morten Bade, Indira Jayaweera, Gopala Krishnan
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Patent number: 7846240Abstract: A method and system for reducing an amount of ammonia in a flue gas stream. The system 100 includes: a wash vessel 180 for receiving an ammonia-containing flue gas stream 170, the wash vessel 180 including a first absorption stage 181a and a second absorption stage 181b, each of the first absorption stage 181a and the second absorption stage 181b having a mass transfer device 184; and a liquid 187 introduced to the wash vessel 180, the liquid 187 for absorbing ammonia from the ammonia-containing flue gas stream 170 thereby forming an ammonia-rich liquid 192 and a reduced ammonia containing flue gas stream 190 exiting the wash vessel 180.Type: GrantFiled: September 9, 2009Date of Patent: December 7, 2010Assignee: ALSTOM Technology LtdInventors: Eli Gal, Indira Jayaweera
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Publication number: 20100083831Abstract: A method and system for reducing an amount of ammonia in a flue gas stream. The system 100 includes: a wash vessel 180 for receiving an ammonia-containing flue gas stream 170, the wash vessel 180 including a first absorption stage 181a and a second absorption stage 181b, each of the first absorption stage 181a and the second absorption stage 181b having a mass transfer device 184; and a liquid 187 introduced to the wash vessel 180, the liquid 187 for absorbing ammonia from the ammonia-containing flue gas stream 170 thereby forming an ammonia-rich liquid 192 and a reduced ammonia containing flue gas stream 190 exiting the wash vessel 180.Type: ApplicationFiled: September 9, 2009Publication date: April 8, 2010Applicant: ALSTOM TECHNOLOGY LTD.Inventors: Eli Gal, Indira Jayaweera
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Publication number: 20090148930Abstract: A chilled ammonia based CO2 capture system and method is provided. A promoter is used to help accelerate certain capture reactions that occur substantially coincident to and/or as a result of contacting a chilled ammonia based ionic solution with a gas stream that contains CO2.Type: ApplicationFiled: November 18, 2008Publication date: June 11, 2009Applicant: ALSTOM Technology LtdInventors: Eli Gal, Otto Morten Bade, Indira Jayaweera, Gopala Krishnan
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Patent number: 6010632Abstract: A process for hot or supercritical water oxidative decomposition of wastes, particularly halogenated organic compounds, is described. The process employs a heterogeneous reagent which accelerates the decomposition and is effective to neutralize acidic byproducts. The reagent is maintained in suspension throughout the reaction by operating at conditions of temperature and pressure at which the heterogeneous reagent is largely or fully insoluble in water, and preferably at which liquid water is not present. Production of potentially corrosive brine is also minimized by operating at conditions under which sodium chloride is insoluble.Type: GrantFiled: April 29, 1998Date of Patent: January 4, 2000Assignee: SRI InternationalInventors: David S. Ross, Indira Jayaweera, David C. Bomberger, Roald N. Leif
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Patent number: 5837149Abstract: This invention relates to a process for the decomposition of material selected from the group consisting of organic compounds, inorganic compounds, or combinations thereof to compounds which are environmentally acceptable, or are amenable to further degradation by conventional disposal systems to produce environmentally acceptable products, which process comprises: (a) conveying an aqueous solution or an aqueous slurry of material into a reaction zone capable of withstanding the temperatures and pressures of decomposition of the material; (b) contacting the material in the reaction zone with aqueous sodium carbonate as a reactant in an amount effective to decompose the material under hot water or supercritical water oxidation conditions of between about 300.degree. and 600.degree. C. and a pressure of between about 20 and 400 atmospheres for between 0.Type: GrantFiled: March 22, 1996Date of Patent: November 17, 1998Assignee: SRI InternationalInventors: David S. Ross, Indira Jayaweera, Roald N. Leif
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Patent number: 5746926Abstract: This invention relates to a process for the decomposition of material selected from halogenated organic compounds, to compounds which are environmentally acceptable, or are amenable to further degradation by conventional disposal systems to produce environmentally acceptable products, which process comprises: (a) conveying an aqueous solution or an aqueous slurry of material into a reaction zone capable of withstanding the temperatures and pressures of decomposition of the material; (b)contacting the material in the reaction zone with aqueous sodium carbonate as a reactant in an amount effective to decompose the material under hydrothermal oxidation conditions of between about 300.degree. and 400.degree. C. and a pressure of between about 20 and 400 atmospheres for between 0.Type: GrantFiled: April 15, 1996Date of Patent: May 5, 1998Assignee: SRI InternationalInventors: David S. Ross, Indira Jayaweera, Roald N. Leif
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Patent number: 5709800Abstract: The present invention relates to a process for the disposal of waste or the conversion of hydrothermally labile chemical groups and compounds to species which are environmentally acceptable, or are amendable to further degradation by conventional disposal systems to produce environmentally acceptable products, which process comprises:(a) conveying an aqueous solution or slurry of the waste material into a reaction zone capable of withstanding the temperatures and pressures of hydrothermal decomposition;(b) reacting the waste material in the reaction zone with an aqueous composition comprising catalyst selected from silica or one or more alkali metal silicates, borates, phosphates, biphosphates, or trisubstituted-phosphates, or comprising as promoting reagent independently selected from one or more alkali metal nitrites, alkaline earth metal nitrites or combinations thereof at between 200.degree. C. and 500.degree. C. and at a pressure between 10 and 400 atmospheres for between about 0.Type: GrantFiled: January 16, 1996Date of Patent: January 20, 1998Assignee: SRI InternationalInventors: David S. Ross, Indira Jayaweera
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Patent number: 5409617Abstract: The present invention relates to a process for the disposal of waste or the conversion of hydrothermally labile chemical groups and compounds to species which are environmentally acceptable, or are amendable to further degradation by conventional disposal systems to produce environmentally acceptable products, which process comprises:(a) conveying an aqueous solution or slurry of ordnance waste material into a reaction zone capable of withstanding the temperatures and pressures of hydrothermal decomposition;(b) reacting the waste material in the reaction zone with an aqueous composition comprising one or more alkali or alkaline earth metal silicates, borates, phosphates, biphosphates, or trisubstituted-phosphates, at between 200.degree. C. and 500.degree. C. and at a pressure between 10 and 400 atmospheres for between about 0.Type: GrantFiled: July 13, 1993Date of Patent: April 25, 1995Assignee: SRI InternationalInventors: David S. Ross, Indira Jayaweera, Lien Nguyen, Georgina P. Hum, Werner R. Haag