Patents by Inventor Surajit Roy
Surajit Roy 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: 7828877Abstract: An inventive adsorptive gas separation process is provided capable of producing a purified methane product gas as a light non-adsorbed product gas as opposed to a heavy desorbed exhaust gas component, from a feed gas mixture comprising at least methane, and carbon dioxide. In an embodiment of the invention, the feed gas mixture may comprise at least about 10% carbon dioxide, and the purified methane product gas may be desirably purified to contain less than about 5000 ppm carbon dioxide. In another embodiment of the invention, the feed gas mixture may comprise at least about 50% carbon dioxide, and the purified methane product gas may be desirably purified to contain less than about 5000 ppm carbon dioxide.Type: GrantFiled: November 7, 2005Date of Patent: November 9, 2010Assignee: Xebec Adsorption, Inc.Inventors: James A. Sawada, Matthew L. Babicki, Amy Chiu, Andre Boulet, Surajit Roy, Edward J. Rode
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Patent number: 7674539Abstract: A process and system for providing a hydrogen-containing gas stream to a fuel cell anode that includes providing a hydrogen-containing gas stream that includes carbon monoxide, introducing the hydrogen-containing gas stream into a pressure swing adsorption module that includes at least one carbon monoxide-selective adsorbent to produce a purified hydrogen-containing gas stream, and introducing the purified hydrogen-containing gas stream to the fuel cell anode. The pressure swing adsorption module can also include a second adsorbent and/or catalyst. Also disclosed is a fuel cell system coupled to an internal combustion engine and a fuel cell system that utilizes fuel cell waste heat for vaporizing a hydrocarbon/water mixture.Type: GrantFiled: April 12, 2006Date of Patent: March 9, 2010Assignee: Xebec Adsorption Inc.Inventors: Bowie G. Keefer, James A. Sawada, Erik P. Johannes, Surajit Roy, Michael J. Brown
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Patent number: 7645324Abstract: Improved adsorbent sheet based parallel passage adsorbent structures for enhancing the kinetic selectivity of certain kinetic-controlled adsorption processes, such as PSA, TSA and PPSA processes, and combinations thereof, are provided. The enhancements in kinetic selectivity made possible through the implementation of the present inventive improved adsorbent structures may unexpectedly enable significant intensification of selected kinetic adsorption processes relative to attainable performance with conventional adsorbent materials in beaded or extruded form. Such process intensification enabled by the present inventive adsorbent structures may provide for increased adsorption cycle frequencies, and increased gas flow velocities within the adsorbent beds, which may increase the productivity and/or recovery of a kinetic adsorption system incorporating the inventive adsorbent structures.Type: GrantFiled: January 6, 2006Date of Patent: January 12, 2010Assignee: Xebec Adsorption Inc.Inventors: Edward J. Rode, Andre J. J. Boulet, Aaron M. Pelman, Matthew L. Babicki, Bowie G. Keefer, James A. Sawada, Soheil Alizadeh-Khiavi, Surajit Roy, Andrea C. Gibbs, Steven M. Kuznicki
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Publication number: 20090214902Abstract: Disclosed embodiments concern adsorptive gas bulk separation systems and methods that may be advantageously less expensive to utilize than some in the prior art. Embodiments of the present invention concern processing a feed gas source, typically comprising at least one fuel gas component and at least one diluent, using a displacement purge adsorptive separator apparatus comprising at least one adsorbent bed, at least one purge gas source for purge regeneration of the at least one adsorbent bed, and a product conduit for supplying upgraded gas product. The feed gas typically is supplied to the displacement purge adsorptive separator apparatus at substantially the ambient pressure of the feed gas source. The displacement purge adsorptive separator apparatus is operable to adsorb at least a portion of the at least one diluent component from the feed gas stream to produce an upgraded gas.Type: ApplicationFiled: June 15, 2006Publication date: August 27, 2009Inventors: Aaron M. Pelman, Surajit Roy, Sean Patrick Mezei
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Publication number: 20070261551Abstract: An inventive adsorptive gas separation process is provided capable of producing a purified methane product gas as a light non-adsorbed product gas as opposed to a heavy desorbed exhaust gas component, from a feed gas mixture comprising at least methane, and carbon dioxide. In an embodiment of the invention, the feed gas mixture may comprise at least about 10% carbon dioxide, and the purified methane product gas may be desirably purified to contain less than about 5000 ppm carbon dioxide. In another embodiment of the invention, the feed gas mixture may comprise at least about 50% carbon dioxide, and the purified methane product gas may be desirably purified to contain less than about 5000 ppm carbon dioxide.Type: ApplicationFiled: November 7, 2005Publication date: November 15, 2007Inventors: James Sawada, Matthew Babicki, Amy Chiu, Andre Boulet, Surajit Roy, Edward Rode
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Patent number: 7189280Abstract: A method and system for adsorptive separation of a feed gas mixture provides for increased system efficiency and product recovery. The requirement for purge gas streams consuming desired product gas to regenerate adsorption beds is reduced through an inventive method for adsorbent selection and adsorption bed and process design.Type: GrantFiled: June 29, 2004Date of Patent: March 13, 2007Assignee: QuestAir Technologies Inc.Inventors: Soheil Alizadeh-Khiavi, Surajit Roy, James A. Sawada
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Publication number: 20060280993Abstract: Power plant systems and processes are described that enable recovery of at least a portion of the fuel storage energy associated with a storage system for supplying fuel to the power plant systems. A first embodiment of an energy-recovery power plant system includes at least one fuel storage container and at least one expander that can receive fuel from the fuel storage container at a first pressure and provide the fuel to the power plant at a second pressure that is lower than the first pressure. A second embodiment of an energy-recovery power plant system includes a first conduit fluidly coupling the fuel storage container and the power plant for delivering fuel from the fuel storage container to the power plant and at least one regenerative thermodynamic cycle engine thermally coupled to the first conduit such that heat may be exchanged between the fuel and a working fluid for the regenerative thermodynamic cycle engine.Type: ApplicationFiled: August 17, 2006Publication date: December 14, 2006Inventors: Bowie Keefer, Surajit Roy, Jean St.-Pierre, Amy Nelson, Shanna Knights
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Publication number: 20060182680Abstract: A process and system for providing a hydrogen-containing gas stream to a fuel cell anode that includes providing a hydrogen-containing gas stream that includes carbon monoxide, introducing the hydrogen-containing gas stream into a pressure swing adsorption module that includes at least one carbon monoxide-selective adsorbent to produce a purified hydrogen-containing gas stream, and introducing the purified hydrogen-containing gas stream to the fuel cell anode. The pressure swing adsorption module can also include a second adsorbent and/or catalyst. Also disclosed is a fuel cell system coupled to an internal combustion engine and a fuel cell system that utilizes fuel cell waste heat for vaporizing a hydrocarbon/water mixture.Type: ApplicationFiled: April 12, 2006Publication date: August 17, 2006Inventors: Bowie Keefer, James Sawada, Erik Johannes, Surajit Roy, Michael Brown
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Publication number: 20060169142Abstract: Improved adsorbent sheet based parallel passage adsorbent structures for enhancing the kinetic selectivity of certain kinetic-controlled adsorption processes, such as PSA, TSA and PPSA processes, and combinations thereof, are provided. The enhancements in kinetic selectivity made possible through the implementation of the present inventive improved adsorbent structures may unexpectedly enable significant intensification of selected kinetic adsorption processes relative to attainable performance with conventional adsorbent materials in beaded or extruded form. Such process intensification enabled by the present inventive adsorbent structures may provide for increased adsorption cycle frequencies, and increased gas flow velocities within the adsorbent beds, which may increase the productivity and/or recovery of a kinetic adsorption system incorporating the inventive adsorbent structures.Type: ApplicationFiled: January 6, 2006Publication date: August 3, 2006Inventors: Edward Rode, Andre Boulet, Aaron Pelman, Matthew Babicki, Bowie Keefer, James Sawada, Soheil Alizadeh-Khiavi, Surajit Roy, Andrea Gibbs, Steven Kuznicki
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Patent number: 7041272Abstract: A process and system for providing a hydrogen-containing gas stream to a fuel cell anode that includes providing a hydrogen-containing gas stream that includes carbon monoxide, introducing the hydrogen-containing gas stream into a pressure swing adsorption module that includes at least one carbon monoxide-selective adsorbent to produce a purified hydrogen-containing gas stream, and introducing the purified hydrogen-containing gas stream to the fuel cell anode. The pressure swing adsorption module can also include a second adsorbent and/or catalyst. Also disclosed is a fuel cell system coupled to an internal combustion engine and a fuel cell system that utilizes fuel cell waste heat for vaporizing a hydrocarbon/water mixture.Type: GrantFiled: October 26, 2001Date of Patent: May 9, 2006Assignee: QuestAir Technologies Inc.Inventors: Bowie G. Keefer, James A. Sawada, Erik P. Johannes, Surajit Roy, Michael J. Brown
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Publication number: 20060090395Abstract: Compact synthesis gas generation systems are provided incorporating effective gas purification means to control the purity of the desired components of the synthesis gas product. The compact synthesis gas generation systems of the invention may particularly incorporate compact rotary pressure swing adsorption systems to accomplish the required gas purification. The compact synthesis gas generation systems of the invention may be adapted to utilize various fuel feedstock's and reforming reactor technologies known generally in the art, and are particularly suitable for use in applications where equipment size is desirably minimized, such as mobile applications.Type: ApplicationFiled: January 29, 2004Publication date: May 4, 2006Inventors: Edward Rode, Marie Taponat, Surajit Roy, Mark Grist
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Publication number: 20050284291Abstract: A method and system for adsorptive separation of a feed gas mixture provides for increased system efficiency and product recovery. The requirement for purge gas streams consuming desired product gas to regenerate adsorption beds is reduced through an inventive method for adsorbent selection and adsorption bed and process design.Type: ApplicationFiled: June 29, 2004Publication date: December 29, 2005Inventors: Soheil Alizadeh-Khiavi, Surajit Roy, James Sawada
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Publication number: 20050129952Abstract: High density adsorbent structures may be constructed in parallel passage contactor configurations using improved high density adsorbent sheets. Improved high density adsorbent sheets may be formed using adsorptively active support or substrate materials upon which adsorbent material is applied, such as by coating processes, so that in the resulting high density adsorbent structure both the substrate and the coated adsorbent material are active in adsorption processes. Alternatively, improved high density adsorbent sheets may be formed comprising precursor materials, such as certain clays, which may be coated onto known support materials and thereafter converted to active adsorbent materials using known conversion techniques. This produces high-density adsorbent sheets comprising adsorbent material without inert binder material fractions. Improved self-supporting adsorbent sheets also may be formed without using support material, resulting in higher adsorbent densities relative to known adsorbent sheets.Type: ApplicationFiled: September 29, 2004Publication date: June 16, 2005Inventors: James Sawada, Soheil Alizadeh-Khiavi, Surajit Roy, Steven Kuznicki
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Patent number: 6902602Abstract: The present disclosure relates to systems and processes for adsorptive gas separations where a first gas mixture including components A and B is to be separated so that a first product of the separation is enriched in component A, while component B is mixed with a third gas component C contained in a displacement purge stream to form a second gas mixture including components B and C, and with provision to prevent cross contamination of component C into the first product containing component A, or of component A into the second gas mixture containing component C. The invention may be applied to hydrogen (component A) enrichment from syngas mixtures, where dilute carbon dioxide (component B) is to be rejected such as directly to the atmosphere, and with preferably nitrogen-enriched air as the displacement purge stream containing residual oxygen (component C).Type: GrantFiled: March 14, 2003Date of Patent: June 7, 2005Assignee: QuestAir Technologies Inc.Inventors: Bowie G. Keefer, Matthew L. Babicki, Andre Jason Joseph Boulet, Aaron M. Pelman, Brian G. Sellars, Surajit Roy
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Publication number: 20040011198Abstract: The present disclosure relates to systems and processes for adsorptive gas separations where a first gas mixture including components A and B is to be separated so that a first product of the separation is enriched in component A, while component B is mixed with a third gas component C contained in a displacement purge stream to form a second gas mixture including components B and C, and with provision to prevent cross contamination of component C into the first product containing component A, or of component A into the second gas mixture containing component C. The invention may be applied to hydrogen (component A) enrichment from syngas mixtures, where dilute carbon dioxide (component B) is to be rejected such as directly to the atmosphere, and with preferably nitrogen-enriched air as the displacement purge stream containing residual oxygen (component C).Type: ApplicationFiled: March 14, 2003Publication date: January 22, 2004Applicant: QuestAir Technologies, Inc.Inventors: Bowie G. Keefer, Matthew L. Babicki, Andre Jason Joseph Boulet, Aaron M. Pelman, Brian G. Sellars, Surajit Roy
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Patent number: 6565635Abstract: Disclosed embodiments of the apparatus address the challenges of rotary PSA systems, both axial and radial flow, with M>1 by providing interpenetrating, layered manifolds to accommodate all of the steps of a complex PSA cycle, suitable with equal compactness for any value of “M”. This approach extends readily to accommodate a plurality of rotary PSA modules and their cooperating compression machinery within a single layered manifold assembly for a single PSA plant train. Described embodiments of the rotary PSA apparatus include stators that define fluid ports. In particular embodiments of the described apparatus, a second stator defines pressure swing adsorption cycle sectors, each sector being defined by a light product delivery port, light product withdrawal ports, and light reflux return ports. The adsorber elements may directly contact one or more of the stators in a fluidly sealing manner (i.e., have a clearance gap of from about 0 to about 50 microns) using described reinforced adsorbers.Type: GrantFiled: September 25, 2001Date of Patent: May 20, 2003Assignee: QuestAir Technologies, Inc.Inventors: Bowie G. Keefer, Matthew Babicki, Brian Sellars, Ian Spencer Parker, David G. Doman, Alain Carel, Surajit Roy
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Publication number: 20020112479Abstract: Power plant systems and processes are described that enable recovery of at least a portion of the fuel storage energy associated with a storage system for supplying fuel to the power plant systems. A first embodiment of an energy-recovery power plant system includes at least one fuel storage container and at least one expander that can receive fuel from the fuel storage container at a first pressure and provide the fuel to the power plant at a second pressure that is lower than the first pressure. A second embodiment of an energy-recovery power plant system includes a first conduit fluidly coupling the fuel storage container and the power plant for delivering fuel from the fuel storage container to the power plant and at least one regenerative thermodynamic cycle engine thermally coupled to the first conduit such that heat may be exchanged between the fuel and a working fluid for the regenerative thermodynamic cycle engine.Type: ApplicationFiled: January 8, 2002Publication date: August 22, 2002Inventors: Bowie G. Keefer, Surajit Roy, Jean St.-Pierre, Amy E. Nelson, Shanna D. Knights
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Publication number: 20020098394Abstract: A process and system for providing a hydrogen-containing gas stream to a fuel cell anode that includes providing a hydrogen-containing gas stream that includes carbon monoxide, introducing the hydrogen-containing gas stream into a pressure swing adsorption module that includes at least one carbon monoxide-selective adsorbent to produce a purified hydrogen-containing gas stream, and introducing the purified hydrogen-containing gas stream to the fuel cell anode. The pressure swing adsorption module can also include a second adsorbent and/or catalyst. Also disclosed is a fuel cell system coupled to an internal combustion engine and a fuel cell system that utilizes fuel cell waste heat for vaporizing a hydrocarbon/water mixture.Type: ApplicationFiled: October 26, 2001Publication date: July 25, 2002Inventors: Bowie G. Keefer, James A. Sawada, Erik P. Johannes, Surajit Roy, Michael J. Brown
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Publication number: 20020066367Abstract: Disclosed embodiments of the apparatus address the challenges of rotary PSA systems, both axial and radial flow, with M>1 by providing interpenetrating, layered manifolds to accommodate all of the steps of a complex PSA cycle, suitable with equal compactness for any value of “M”. This approach extends readily to accommodate a plurality of rotary PSA modules and their cooperating compression machinery within a single layered manifold assembly for a single PSA plant train. Described embodiments of the rotary PSA apparatus include stators that define fluid ports. In particular embodiments of the described apparatus, a second stator defines pressure swing adsorption cycle sectors, each sector being defined by a light product delivery port, light product withdrawal ports, and light reflux return ports. The adsorber elements may directly contact one or more of the stators in a fluidly sealing manner (i.e., have a clearance gap of from about 0 to about 50 microns) using described reinforced adsorbers.Type: ApplicationFiled: September 25, 2001Publication date: June 6, 2002Inventors: Bowie G. Keefer, Matthew Babicki, Brian Sellars, Ian Spencer Parker, David G. Doman, Alain Carel, Surajit Roy
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Publication number: 20020034458Abstract: A process of producing hydrogen by autothermal steam reformation of a hydrocarbon comprises the steps of providing a reactor vessel having a fluidized catalyst bed, introducing steam and a gaseous hydrocarbon, introducing oxygen, maintaining the bed temperature below the spontaneous combustion temperature of the hydrocarbon in a fluidized bed, and withdrawing hydrogen by means of a perm selective membrane. An apparatus for producing hydrogen comprises a reactor vessel, steam and hydrocarbon inlets, an oxygen inlet, a fluidized bed of catalyst within the reactor vessel and a perm selective membrane for withdrawing hydrogen from the reactor.Type: ApplicationFiled: October 4, 2001Publication date: March 21, 2002Inventors: Surajit Roy, Barry Pruden, Alaa Adris, John Grace