Patents by Inventor Mohamed Safdar Allie Baksh
Mohamed Safdar Allie Baksh 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: 8016914Abstract: The present invention provides a method and a control system for controlling an adsorbent bed unit in which an adsorbent bed concentration of an impurity within an adsorbent bed of the adsorbent bed unit is measured. The adsorbent bed concentration is controlled by manipulating the feed cycle time during which an adsorbent bed is adsorbing the impurities to maintain the adsorbent bed concentration at a targeted adsorption bed concentration. The targeted adsorption bed concentration is determined such that the product impurity concentration is maintained at product impurity concentration targets. The method and control system can incorporate a supervisory level of control reactive to product impurity concentration levels and related targets to determine the targeted adsorption bed concentration and a primary level of control that calculates the feed cycle time based upon an error between the measured and targeted adsorption bed concentrations. Proportional integral control can be used for such purposes.Type: GrantFiled: March 25, 2009Date of Patent: September 13, 2011Assignee: Praxair Technology, Inc.Inventors: Paul W. Belanger, Mohamed Safdar Allie Baksh, Preeti Chandra, Andrew C. Rosinski
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Patent number: 7867320Abstract: The present invention relates to a dual feed and dual vacuum four bed VPSA process for selectively adsorbing a component from a feed stream, e.g., nitrogen from air, to produce an oxygen-enriched gas stream using a multi-port indexing drum valve, a system comprising a multi-port indexing drum valve and method for operating such a system.Type: GrantFiled: September 30, 2008Date of Patent: January 11, 2011Assignee: Praxair Technology, Inc.Inventors: Mohamed Safdar Allie Baksh, Michael S. Manning, Ashwin Desai, Preeti Chandra, Paul William Belanger
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Publication number: 20100251892Abstract: The present invention relates generally to processes and systems for recovering helium from low helium-containing feed gases (i.e., containing less than about 10 volume % helium and more typically, less than about 5% helium by volume). The present invention more particularly relates to processes and systems for recovering helium from low helium-containing feed gases using temperature swing adsorption (TSA) systems and multiple (e.g. two) stage vacuum pressure swing adsorption (VPSA) systems. In preferred embodiments of the invention, the first stage VPSA system is configured to provide regeneration gas for the TSA system, and/or the VPSA second stage tail gas is recycled to the first stage VPSA system.Type: ApplicationFiled: April 28, 2010Publication date: October 7, 2010Inventor: Mohamed Safdar Allie Baksh
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Publication number: 20100242722Abstract: The present invention provides a method and a control system for controlling an adsorbent bed unit in which an adsorbent bed concentration of an impurity within an adsorbent bed of the adsorbent bed unit is measured. The adsorbent bed concentration is controlled by manipulating the feed cycle time during which an adsorbent bed is adsorbing the impurities to maintain the adsorbent bed concentration at a targeted adsorption bed concentration. The targeted adsorption bed concentration is determined such that the product impurity concentration is maintained at product impurity concentration targets. The method and control system can incorporate a supervisory level of control reactive to product impurity concentration levels and related targets to determine the targeted adsorption bed concentration and a primary level of control that calculates the feed cycle time based upon an error between the measured and targeted adsorption bed concentrations. Proportional integral control can be used for such purposes.Type: ApplicationFiled: March 25, 2009Publication date: September 30, 2010Inventors: Paul W. Belanger, Mohamed Safdar Allie Baksh, Preeti Chandra, Andrew C. Rosinski
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Patent number: 7780764Abstract: The present invention relates generally to processes and systems for recovering helium from low helium-containing feed gases (i.e., containing less than about 10 volume % helium and more typically, less than about 5% helium by volume). The present invention more particularly relates to processes and systems for recovering helium from low helium-containing feed gases using temperature swing adsorption (TSA) systems and multiple (e.g. two) stage vacuum pressure swing adsorption (VPSA) systems. In preferred embodiments of the invention, the first stage VPSA system is configured to provide regeneration gas for the TSA system, and/or the VPSA second stage tail gas is recycled to the first stage VPSA system.Type: GrantFiled: June 27, 2008Date of Patent: August 24, 2010Assignee: Praxair Technology, Inc.Inventor: Mohamed Safdar Allie Baksh
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Patent number: 7763100Abstract: Novel polybed VPSA process and system to achieve enhanced O2 recovery are disclosed. The VPSA process comprises using three or more adsorber beds; providing a continuous feed supply gas using a single feed blower to one bed, wherein at any instant during the process, two beds are in an evacuation step and only one bed is in a feed mode; and purging the adsorber beds using two purge gases of different purity. The VPSA cycle may further comprise utilizing a storage device (e.g., a packed or empty equalization tank) to capture void gases during co-current depressurization step of the VPSA cycle, which is used at a later stage for purging and repressurization of the bed. In addition, the VPSA process employs a single feed compressor and two vacuum pumps at 100% utilization. Furthermore, the use of the storage device minimizes the use of product quality gas for purging. About 10-20% improvement in O2 productivity is realized in the new VPSA process.Type: GrantFiled: July 6, 2006Date of Patent: July 27, 2010Assignee: Praxair Technology, Inc.Inventors: Mohamed Safdar Allie Baksh, Andrew Chester Rosinski
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Publication number: 20100077920Abstract: The present invention relates to a dual feed and dual vacuum four bed VPSA process for selectively adsorbing a component from a feed stream, e.g., nitrogen from air, to produce an oxygen-enriched gas stream using a multi-port indexing drum valve, a system comprising a multi-port indexing drum valve and method for operating such a system.Type: ApplicationFiled: September 30, 2008Publication date: April 1, 2010Inventors: MOHAMED SAFDAR ALLIE BAKSH, Michael S. Manning, Ashwin Desai, Preeti Chandra, Paul William Belanger
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Publication number: 20090320679Abstract: The present invention relates generally to processes and systems for recovering helium from low helium-containing feed gases (i.e., containing less than about 10 volume % helium and more typically, less than about 5 % helium by volume). The present invention more particularly relates to processes and systems for recovering helium from low helium-containing feed gases using temperature swing adsorption (TSA) systems and multiple (e.g. two) stage vacuum pressure swing adsorption (VPSA) systems. In preferred embodiments of the invention, the first stage VPSA system is configured to provide regeneration gas for the TSA system, and/or the VPSA second stage tail gas is recycled to the first stage VPSA system.Type: ApplicationFiled: June 27, 2008Publication date: December 31, 2009Applicant: Praxair Technology, Inc.Inventor: Mohamed Safdar Allie Baksh
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Patent number: 7537742Abstract: This invention discloses an optimum set of adsorbents for use in H2-PSA processes. Each adsorbent bed is divided into four regions; Region 1 contains adsorbent for removing water; Region 2 contains a mixture of strong and weak adsorbents to remove bulk impurities like CO2; Region 3 contains a high bulk density (>38 lbm/ft3) adsorbent to remove remaining CO2; and most of CH4 and CO present in H2 containing feed mixtures; and Region 4 contains adsorbent having high Henry's law constants for the final cleanup of N2 and residual impurities to produce hydrogen at the desired high purity.Type: GrantFiled: December 22, 2003Date of Patent: May 26, 2009Assignee: Praxair Technology, Inc.Inventors: Mohamed Safdar Allie Baksh, Mark William Ackley, Frank Notaro
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Publication number: 20080282891Abstract: The present invention generally relates to large capacity (e.g., greater than 350 tons/day O2) vacuum pressure adsorption (VPSA) systems and processes that employ a single train including four beds, at least one feed compressor feeding two beds simultaneously at any given instant in time, and a single vacuum pump. The compressor(s) and the vacuum pump can be utilized 100% of the time. Use of product quality gas for purging is avoided, with about 10-20% improvement in O2 productivity and 5-10% reduction in capital cost expected.Type: ApplicationFiled: June 3, 2008Publication date: November 20, 2008Applicant: Praxair Technology, Inc.Inventors: Mohamed Safdar Allie Baksh, Andrew Rosinski
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Patent number: 7396387Abstract: The present invention generally relates to large capacity (e.g., greater than 350 tons/day O2) vacuum pressure adsorption (VPSA) systems and processes that employ a single train including four beds, at least one feed compressor feeding two beds simultaneously at any given instant in time, and a single vacuum pump. The compressor(s) and the vacuum pump can be utilized 100% of the time. Use of product quality gas for purging is avoided, with about 10-20% improvement in O2 productivity and 5-10% reduction in capital cost expected.Type: GrantFiled: November 1, 2005Date of Patent: July 8, 2008Assignee: Praxair Technology, Inc.Inventors: Mohamed Safdar Allie Baksh, Andrew Rosinski
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Publication number: 20080148936Abstract: The present invention relates to composite structured adsorbents and methods of use therefor. The invention more particularly relates to composite structured adsorbents that can include a multi-channel framework (e.g., monoliths), the channels of the multi-channel framework containing adsorbent beads particles therein, with a channel-to-particle diameter ratio in the range of 1 to 10, more preferably 1 to 7 and even more preferably 1 to 5. In the case of non-spherical particles, the hydraulic diameter is used in the calculation of the channel-to-particle diameter. The composite structured adsorbents of the present invention can be used in various industrial applications, for example in pressure swing adsorption (PSA) or vacuum pressure swing adsorption (VPSA) processes to produce O2 from air.Type: ApplicationFiled: December 22, 2006Publication date: June 26, 2008Inventor: Mohamed Safdar Allie Baksh
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Publication number: 20080006151Abstract: Novel polybed VPSA process and system to achieve enhanced O2 recovery are disclosed. The VPSA process comprises using three or more adsorber beds; providing a continuous feed supply gas using a single feed blower to one bed, wherein at any instant during the process, two beds are in an evacuation step and only one bed is in a feed mode; and purging the adsorber beds using two purge gases of different purity. The VPSA cycle may further comprise utilizing a storage device (e.g., a packed or empty equalization tank) to capture void gases during co-current depressurization step of the VPSA cycle, which is used at a later stage for purging and repressurization of the bed. In addition, the VPSA process employs a single feed compressor and two vacuum pumps at 100% utilization. Furthermore, the use of the storage device minimizes the use of product quality gas for purging. About 10-20% improvement in O2 productivity is realized in the new VPSA process.Type: ApplicationFiled: July 6, 2006Publication date: January 10, 2008Inventors: Mohamed Safdar Allie Baksh, Andrew Chester Rosinski
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Patent number: 7294172Abstract: A gas recovery system comprising a source of gas having a preselected concentration of a desired component (9), at least one application (1) that adds impurities to said gas, and at least one an adsorption system (6) that purifies said gas to produce a purified gas for re-use in application (1), wherein said at least one adsorption system includes at least one adsorbent bed (A) having at least three layers of adsorbents. A recovery process is also disclosed.Type: GrantFiled: July 31, 2002Date of Patent: November 13, 2007Assignee: Praxair Technology, Inc.Inventors: Mohamed Safdar Allie Baksh, Scot Eric Jaynes, Bernard Thomas Neu, James Smolarek, Mark Thomas Emley
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Patent number: 7276107Abstract: The present invention relates to a PSA system using an indexing rotary dual valve regulating a stepping mode of operation that controls a variable bed inlet feed flow rate, controllable pressure between feed lines in different beds of the PSA system and varied output flow rate of product gas such as high purity hydrogen gas.Type: GrantFiled: December 23, 2003Date of Patent: October 2, 2007Assignee: Praxair Technology, Inc.Inventors: Mohamed Safdar Allie Baksh, Michael S. Manning, Andrew C. Rosinski, James Smolarek, Alan Barnard Stewart, Bernard Thomas Neu
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Patent number: 7179324Abstract: A three-bed pressure swing adsorption system providing a constant continuous supply gas, preferably containing a hydrogen component, in a multi-step and preferably in a twelve-step, process cycle that can produce a purified gas product, preferably hydrogen, on a constant flow.Type: GrantFiled: May 19, 2004Date of Patent: February 20, 2007Assignee: Praxair Technology, Inc.Inventors: Mohamed Safdar Allie Baksh, Andrew C. Rosinski
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Patent number: 7169210Abstract: The present invention relates to a gas recycling system that includes a) a source of gas having a predetermined purity; b) an application system that uses the gas and adds contaminants to the gas; c) an adsorption system for removing the contaminants from the gas to produce a purified gas and a waste gas; d) a gas purity analyzer for measuring the amount of the contaminants in the waste gas; and e) conduits connecting the gas source to the application system, and the application system to the adsorption system.Type: GrantFiled: July 31, 2002Date of Patent: January 30, 2007Assignee: Praxair Technology, Inc.Inventors: Mohamed Safdar Allie Baksh, Scot Eric Jaynes, Bernard Thomas Neu, James Smolarek, Mark Thomas Emley
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Patent number: 7166151Abstract: The present invention is a PSA system having at least one vessel that uses a multi-segmented flow distributor to provide a uniform fluid across the adsorbent bed in the vessel.Type: GrantFiled: January 15, 2004Date of Patent: January 23, 2007Assignee: Praxair Technology, Inc.Inventors: Mohamed Safdar Allie Baksh, Bernard Thomas Neu, Dariush H. Zadeh
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Publication number: 20040237789Abstract: A gas recovery system comprising a source of gas having a preselected concentration of a desired component (9), at least one application (1) that adds impurities to said gas, and at least one an adsorption system (6) that purifies said gas to produce a purified gas for re-use in application (1), wherein said at least one adsorption system includes at least one adsorbent bed (A) having at least three layers of adsorbents. A recovery process is also disclosed.Type: ApplicationFiled: January 27, 2004Publication date: December 2, 2004Inventors: Mohamed Safdar Allie Baksh, Scot Eric Jaynes, Bernard Thomas Neu, James Smolarek, Mark Thomas Emley
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Publication number: 20040216609Abstract: The invention comprises a gas recycling system comprising: a) a source of gas having a predetermined purity (28); b) an application system (6) that uses said gas and adds contaminants to said gas; c) an adsorption system (1) for removing said contaminants from said gas to produce a purified gas, and a waste gas; d) a gas purity analyzer (100) for measuring the amount of said contaminants in said waste gas; e) conduits ((5), (8), (9) (13) and (15) connecting the gas source (4) to said application system, said application system (6) to said adsorption system.Type: ApplicationFiled: June 23, 2004Publication date: November 4, 2004Inventors: Mohamed Safdar Allie Baksh, Scot Eric Jaynes, Bernard Thomas Neu, James Smolarek, Mark Thomas Emley