Patents by Inventor Robert B. Fedich
Robert B. Fedich 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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Publication number: 20150027056Abstract: A process for increasing the selectivity of an alkanolamine absorption process for selectively removing hydrogen sulfide (H2S) from a gas mixture which also contains carbon dioxide (CO2) and possibly other acidic gases such as COS, HCN, CS2 and sulfur derivatives of C1 to C4 hydrocarbons, comprises contacting the gas mixture with a liquid absorbent which is a severely sterically hindered capped alkanolamine. The improvement in selectivity is achieved at the high(er) pressures, typically least about 10 bara at conditions nearing the H2S/CO2 equilibrium at which CO2 begins to displace absorbed hydrosulfide species from the absorbent solution.Type: ApplicationFiled: July 3, 2014Publication date: January 29, 2015Applicant: ExxonMobil Research and Engineering CompanyInventors: Pavel Kortunov, Michael Siskin, Robert B. Fedich
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Publication number: 20150027055Abstract: A process for increasing the selectivity of an alkanolamine absorption process for selectively removing hydrogen sulfide (H2S) from a gas mixture which also contains carbon dioxide (CO2) and possibly other acidic gases such as COS, HCN, CS2 and sulfur derivatives of C1 to C4 hydrocarbons, comprises contacting the gas mixture with a liquid absorbent which is a severely sterically hindered capped alkanolamine or more basic sterically hindered secondary and tertiary amine. The improvement in selectivity is achieved at the high(er) pressures, typically least about 10 bara at conditions nearing the H2S/CO2 equilibrium at which CO2 begins to displace absorbed hydrosulfide species from the absorbent solution.Type: ApplicationFiled: July 24, 2014Publication date: January 29, 2015Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANYInventors: Pavel Kortunov, Michael Siskin, Robert B. Fedich
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Patent number: 8771594Abstract: Aminoethers are used as corrosion inhibitors in boiler systems in which a working fluid comprising water with an aminoether corrosion inhibitor is circulated from a heater to a utilization site at which the working fluid gives up energy and decreases in temperature. A preferred class of aminoethers are the alkoxytriethyleneglycol-tert-alkylamines such as methoxy triethyleneglycol-tert-butylamine.Type: GrantFiled: May 15, 2012Date of Patent: July 8, 2014Assignee: ExxonMobil Research and Engineering CompanyInventors: Michael Siskin, Robert B. Fedich, Michel A. Daage
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Publication number: 20140178278Abstract: Systems and methods are provided for performing CO2 sorption and regeneration processes that can take advantage of phase changes between solutions of amine-CO2 reaction products and precipitate slurries, where the slurry particles can include solid precipitates formed based on the amine-CO2 reaction products. An amine solution can be used to capture CO2 from a gas phase stream. During this initial capture process, the amine-CO2 reaction product can remain in solution. The solution containing the amine-CO2 reaction product can then be exposed to a set of conditions which result in precipitation of a portion of the amine-CO2 reaction product to form a slurry. The precipitate slurry can be passed into one or more release stages where the conditions for the slurry are altered to allow for release of the CO2.Type: ApplicationFiled: November 22, 2013Publication date: June 26, 2014Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANYInventors: Michael Siskin, Patrick L. Hanks, Pavel Kortunov, Robert B. Fedich, Patrick P. McCall, Hans Thomann, Daniel Leta, Lisa S. Baugh, David C. Calabro, Harry W. Deckman
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Publication number: 20130309129Abstract: Aminoethers are used as corrosion inhibitors in boiler systems in which a working fluid comprising water with an aminoether corrosion inhibitor is circulated from a heater to a utilization site at which the working fluid gives up energy and decreases in temperature. A preferred class of aminoethers are the alkoxytriethyleneglycol-tert-alkylamines such as methoxy triethyleneglycol-tert-butylamine.Type: ApplicationFiled: May 15, 2012Publication date: November 21, 2013Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANYInventors: Michael SISKIN, Robert B. FEDICH, Michel A. DAAGE
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Publication number: 20130310623Abstract: A process for the selective absorption of acidic components from normally gaseous hydrocarbon mixtures using an aqueous amine absorbent solution comprising an antioxidant and a non-detergent co-solvent for the amine and the antioxidant.Type: ApplicationFiled: May 15, 2012Publication date: November 21, 2013Applicant: ExxonMobil Research and Engineering CompanyInventors: Michael SISKIN, Robert B. FEDICH, Michel A. DAAGE
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Patent number: 8524184Abstract: A process for the removal of hydrogen sulfide from a gas stream in which the gas stream is first passed through a Claus unit operating at a sub-stoichiometric ratio (H2S:SO2) of greater than 2:1 to produce a tail gas stream comprising less than 2000 vppm SO2. This tail gas stream is then treated to increase the sulfur recovery to at least 99.5% by first directly cooling the tail gas stream by contact with water as a coolant, followed by contacting the gas stream with a circulating stream of a dilute, absorbent solution of a severely sterically hindered secondary aminoether alcohol to further cool the gas stream, and then removing the H2S from the stream using a stronger absorbent solution of a severely sterically hindered secondary aminoether alcohol.Type: GrantFiled: June 29, 2010Date of Patent: September 3, 2013Assignee: ExxonMobil Research and Engineering CompanyInventors: Jagannathan N. Iyengar, David Perry, Robert B. Fedich
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Publication number: 20110217218Abstract: A method and system for the selective removal of CO2 and/or H2S from a gaseous stream containing one or more acid gases. In particular, a system and method for separating CO2 and/or H2S from a gas mixture containing an acid gas using an absorbent solution and one or more ejector venturi nozzles in flow communication with one or more absorbent contactors. The method involves contacting a gas mixture containing at least one acid gas with the absorbent solution under conditions sufficient to cause absorption of at least a portion of said acid gas. The absorbent contactors operate in co-current flow and are arranged in a counter-current configuration to increase the driving force for mass transfer. Monoliths can be used that operate in a Taylor flow or slug flow regime. The absorbent solution is treated under conditions sufficient to cause desorption of at least a portion of the acid gas.Type: ApplicationFiled: February 18, 2011Publication date: September 8, 2011Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANYInventors: Ramesh Gupta, Krishnan Sankaranarayanan, Himanshu Gupta, Benjamin A. McCool, Robert B. Fedich, Richard D. Lenz
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Publication number: 20110008229Abstract: A process for the removal of hydrogen sulfide from a gas stream in which the gas stream is first passed through a Claus unit operating at a sub-stoichiometric ratio (H2S:SO2) of greater than 2:1 to produce a tail gas stream comprising less than 2000 vppm SO2. This tail gas stream is then treated to increase the sulfur recovery to at least 99.5% by first directly cooling the tail gas stream by contact with water as a coolant, followed by contacting the gas stream with a circulating stream of a dilute, absorbent solution of a severely sterically hindered secondary aminoether alcohol to further cool the gas stream, and then removing the H2S from the stream using a stronger absorbent solution of a severely sterically hindered secondary aminoether alcohol.Type: ApplicationFiled: June 29, 2010Publication date: January 13, 2011Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANYInventors: Jagannathan N. IYENGAR, David PERRY, Robert B. FEDICH
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Patent number: 6692711Abstract: Sour natural gas is processed to remove the sulfur compounds and recover C4+/C5+ hydrocarbons by scrubbing the gas with an amine solution to remove most of the sulfur, followed cooling the gas to remove C4+/C5+ hydrocarbons and more sulfur compounds as liquid condensate to produce a gas having less than 20 vppm of total sulfur. The condensate is sent to a fractionator to recover the C4+/C5+ hydrocarbons. The sulfur and hydrocarbon reduced gas is contacted first with zinc oxide and then nickel, to produce a gas having less than 10 vppb of total sulfur which is passed into a synthesis gas generating unit to form a very low sulfur synthesis gas comprising a mixture of H2 and CO. This synthesis gas is useful for hydrocarbon synthesis with increased life of the hydrocarbon synthesis catalyst and greater hydrocarbon production from the hydrocarbon synthesis reactor. Contacting the synthesis gas with zinc oxide further reduces the sulfur content to below 3 vppb.Type: GrantFiled: June 2, 2000Date of Patent: February 17, 2004Assignee: ExxonMobil Research and Engineering CompanyInventors: Dennis G. Alexion, Robert B. Fedich, John C. Wilbur, James H. Taylor, Jr., James P. Glass, Jr., Geoffrey R. Say, Richard P. O'Connor
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Publication number: 20030178342Abstract: Sour natural gas is processed to remove the sulfur compounds and recover C4+/C5+ hydrocarbons by scrubbing the gas with an amine solution to remove most of the sulfur, followed cooling the gas to remove C4+/C5+ hydrocarbons and more sulfur compounds as liquid condensate to produce a gas having less than 20 vppm of total sulfur. The condensate is sent to a fractionator to recover the C4+/C5+ hydrocarbons. The sulfur and hydrocarbon reduced gas is contacted first with zinc oxide and then nickel, to produce a gas having less than 10 vppb of total sulfur which is passed into a synthesis gas generating unit to form a very low sulfur synthesis gas comprising a mixture of H2 and CO. This synthesis gas is useful for hydrocarbon synthesis with increased life of the hydrocarbon synthesis catalyst and greater hydrocarbon production from the hydrocarbon synthesis reactor. Contacting the synthesis gas with zinc oxide further reduces the sulfur content to below 3 vppb.Type: ApplicationFiled: March 14, 2003Publication date: September 25, 2003Inventors: Dennis G. Alexion, Robert B. Fedich, John C. Wilbur, James H. Taylor, James P. Glass, Geoffrey R. Say, Richard P. O'Connor
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Patent number: 6168768Abstract: Sour natural gas is processed to remove the sulfur compounds and recover C4+/C5+ hydrocarbons by scrubbing the gas with an amine solution to remove most of the sulfur, followed cooling the gas to remove C4+/C5+ hydrocarbons and more sulfur compounds as liquid condensate to produce a gas having less than 20 vppm of total sulfur. The condensate is sent to a fractionator to recover the C4+C5+ hydrocarbons. The sulfur and hydrocarbon reduced gas is contacted first with zinc oxide and then nickel, to produce a gas having less than 10 vppb of total sulfur which is passed into a synthesis gas generating unit to form a very low sulfur synthesis gas comprising a mixture of H2 and CO. This synthesis gas is useful for hydrocarbon synthesis with increased life of the hydrocarbon synthesis catalyst and greater hydrocarbon production from the hydrocarbon synthesis reactor. Contacting the synthesis gas with zinc oxide further reduces the sulfur content to below 3 vppb.Type: GrantFiled: January 23, 1998Date of Patent: January 2, 2001Assignee: Exxon Research and Engineering CompanyInventors: Dennis G. Alexion, Robert B. Fedich, John C. Wilbur, James H. Taylor, Jr., James P. Glass, Jr., Geoffrey R. Say, Richard P. O'Connor