Patents by Inventor Mutsunori Karasaki
Mutsunori Karasaki 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: 6689332Abstract: A process for removing CO2 from a combustion gas which comprises bringing a combustion gas containing oxygen and CO2 and a CO2 absorbent solution into contact at the atmospheric pressure, thereby allowing the CO2 absorbent solution to absorb CO2 from the combustion gas, and, in the ensuing step, heating the absorbent solution that has absorbed CO2 to liberate CO2 and regenerate the CO2 absorbent solution, and circulating the regenerated solution for reuse. An aqueous solution of a hindered amine selected from the group consisting of 2-amino-2-methyl-1-propanol (AMP), 2-(ethylamino)-ethanol (EAE), 2-(methylamino)-ethanol (MAE), and 2-(diethylamino)-ethanol (DEAE) is used as the CO2 absorbent solution, and carbon steel is used in building the members of the equipment that contact the aqueous hindered amine solution. The absorbent solution contains cupric carbonate which is a corrosion inhibitor.Type: GrantFiled: February 20, 1996Date of Patent: February 10, 2004Assignees: The Kansai Electric Power Co, Inc., Mitsubishi Jukogyo Kabushiki KaishaInventors: Kunihiko Yoshida, Tomio Mimura, Shigeru Shimojo, Mutsunori Karasaki, Masaki Iijima, Shigeaki Mitsuoka
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Patent number: 6500397Abstract: There are disclosed a method for removing CO2 from a combustion exhaust gas which comprises the step of bringing the combustion exhaust gas under atmospheric pressure into contact with an aqueous solution of a hindered amine selected from the group consisting of 2-amino-2-methyl-1-propanol, 2-methylaminoethanol, 2-ethylamino-ethanol and 2-piperidineethanol; and another method for removing carbon dioxide from a combustion exhaust gas which comprises the step of bringing the combustion exhaust gas under atmospheric pressure into contact with a mixed aqueous solution of 100 parts by weight of an amine compound (X) selected from the group consisting of 2-amino-2-methyl-1, 3-propanediol, 2-amino-2-methyl-1-propanol, 2-amino-2-ethyl-1, 3-propanediol, t-butyldiethanolamine and 2-amino-2-hydroxymethyl-1,3-propanediol; and 1-25 parts by weight of an amine compound (Y) selected from the group consisting of piperazine, piperidine, morpholine, glycine, 2-methylamino-ethanol, 2-piperidineethanol and 2-ethylaminoethanol.Type: GrantFiled: November 6, 1998Date of Patent: December 31, 2002Assignees: The Kansai Electrical Power Co., Inc., Mitsubishi Jukogyo Kabushiki KaishaInventors: Kunihiko Yoshida, Tomio Mimura, Shigeru Shimojo, Mutsunori Karasaki, Masaki Iijima, Touru Seto, Shigeaki Mitsuoka
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Patent number: 6274108Abstract: A process is provided for removing carbon dioxide out of combustion exhaust gas by scrubbing the exhaust gas with an aqueous solution of monoethanolamine in a scrubber, and regenerating the carbon dioxide-loaded aqueous solution of monoethanolamine in a regenerator. The process is provided with means for replenishing the aqueous solution of monoethanolamine with a stock, aqueous solution containing from about 70% to about 75% by weight of monoethanolamine. By providing a stock, aqueous solution containing from about 70% to about 75% by weight of monoethanolamine, which is injected into the carbon dioxide-loaded aqueous solution of monoethanolamine being transferred from the scrubber to the regenerator, the entire carbon dioxide recovery system is free from flammables, rendering fire-fighting precautions unnecessary.Type: GrantFiled: February 28, 1997Date of Patent: August 14, 2001Assignees: The Kansai Electric Power Co., Ltd., Mitsubishi Jukogyo Kabushiki KaishaInventors: Masumi Fujii, Yoshitsugu Hotta, Taiichiro Suda, Kenji Kobayashi, Kunihiko Yoshida, Shigeru Shimojo, Mutsunori Karasaki, Masaki Iijima, Toru Seto, Shigeaki Mitsuoka
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Patent number: 6036931Abstract: There are disclosed a method for removing CO.sub.2 from a combustion exhaust gas which comprises the step of bringing the combustion exhaust gas under atmospheric pressure into contact with an aqueous solution of a hindered amine selected from the group consisting of 2-amino-2-methyl-1-propanol, 2-methylaminoethanol, 2-ethylaminoethanol and 2-piperidineethanol; and another method for removing carbon dioxide from a combustion exhaust gas which comprises the step of bringing the combustion exhaust gas under atmospheric pressure into contact with a mixed aqueous solution of 100 parts by weight of an amine compound (X) selected from the group consisting of 2-amino-2-methyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, 2-amino-2-ethyl-1,3-propanediol, t-butyldiethanolamine and 2-amino-2-hydroxymethyl-1,3-propanediol; and 1-25 parts by weight of an amine compound (Y) selected from the group consisting of piperazine, piperidine, morpholine, glycine, 2-methylaminoethanol, 2-piperidineethanol and 2-ethylaminoethanol.Type: GrantFiled: June 3, 1997Date of Patent: March 14, 2000Assignees: The Kansai Electric Power Co., Inc., Mitsubishi Jukogyo Kabushiki KaishaInventors: Kunihiko Yoshida, Tomio Mimura, Shigeru Shimojo, Mutsunori Karasaki, Masaki Iijima, Touru Seto, Shigeaki Mitsuoka
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Patent number: 5603908Abstract: A process for removing CO.sub.2 from a combustion gas which comprises removing CO.sub.2 from the combustion gas through contact of an aqueous hindered amine solution used as a CO.sub.2 absorbent solution with the combustion gas at atmospheric pressure and then, in a regeneration column, liberating CO.sub.2 from the absorbent solution that has absorbed CO.sub.2 by heating it and thereby regenerating the absorbent solution. The process further comprises a partial absorbent solution regeneration step in at least one stage wherein the absorbent solution that has absorbed CO.sub.2 is heated through heat exchange with a high-temperature regenerated absorbent solution and part of the CO.sub.2 that is liberated is separated from the absorbent solution. Following this, according to the necessity, part of the partially regenerated absorbent solution thus obtained is returned to the step of removing CO.sub.2 from the combustion gas for use as part of the CO.sub.Type: GrantFiled: May 22, 1996Date of Patent: February 18, 1997Assignees: The Kansai Electric Power Co., Inc., Mitsubishi Jukogyo Kabushiki KaishaInventors: Kunihiko Yoshida, Tomio Mimura, Shigeru Shimojo, Mutsunori Karasaki, Masaki Iijima, Touru Seto, Shigeaki Mitsuoka
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Patent number: 5536454Abstract: An apparatus for gas-liquid contact in which tubular structure fillers having a cross section of any of various shapes and having straight tubular portions are arranged in a substantially vertical direction in the form of plural steps so that the gas-liquid contact surfaces of the fillers may be parallel with the flow of the gas,the apparatus for gas-liquid contact being characterized in that the gas-liquid contact surfaces comprise rough surface portions, porous surface portions, meshes or plates to which meshes adhere, or there is interposed, between the plural steps of the fillers, a dispersing plate for receiving the liquid downward coming from the site above the fillers, dispersing the liquid, and allowing the liquid to downward flow.Type: GrantFiled: June 5, 1995Date of Patent: July 16, 1996Assignees: Mitsubishi Jukogyo Kabushiki Kaisha, Kansai Electric Power Co., Inc.Inventors: Masumi Fujii, Yoshitsugu Hotta, Taiichiro Suda, Kouichi Kitamura, Yukihiro Jinno, Tomio Mimura, Shigeru Shimojo, Masami Kawasaki, Kunihiko Yoshida, Mutsunori Karasaki, Masaki Iijima, Shigeaki Mitsuoka
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Patent number: 5378442Abstract: A method for recovering carbon dioxide by absorbing carbon dioxide present in a combustion exhaust gas using an aqueous alkanolamine solution, comprising the step of bringing a combustion exhaust gas from which carbon dioxide has been absorbed and removed into contact with water containing carbon dioxide. A method for treating a combustion exhaust gas for denitration using ammonia as a reducing agent and for removal of carbon dioxide by absorption with an aqueous alkanolamine solution, which method comprising the steps of recovering ammonia present in the combustion exhaust gas after the carbon dioxide removal, and using the recovered ammonia as a reducing agent for the denitration. A method for removing CO.sub.2 from a combustion exhaust gas comprising the step of bringing the combustion exhaust gas into contact under atmospheric pressure with an aqueous monoethanolamine solution having a concentration of 35% by weight or more.Type: GrantFiled: January 13, 1993Date of Patent: January 3, 1995Assignees: The Kansai Electric Power Co., Inc., Mitsubishi Jukogyo Kabushiki KaishaInventors: Masumi Fujii, Taiichiro Suda, Yoshitsugu Hotta, Kenji Kobayashi, Kunihiko Yoshida, Shigeru Shimojo, Koichi Kitamura, Masami Kawasaki, Mutsunori Karasaki, Masaki Iijima, Touru Seto, Shigeaki Mitsuoka
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Patent number: 5344627Abstract: A process for removing carbon dioxide (CO.sub.2) from a combustion exhaust gas of a boiler (1) which generates steam for driving high (3), intermediate (7), and low (8) pressure turbines. The process comprises the steps of removing CO.sub.2 in the combustion exhaust gas by absorption with a CO.sub.2 -absorbing liquid (19), liquefying the removed CO.sub.2 (28) by compression (42) and cooling (48), storing (52) the CO.sub.2, and regenerating the CO.sub.2 -absorbing liquid by a CO.sub.2 -absorbing liquid regeneration column (24) equipped with a reboiler (30). In the process, a part (40) of steam discharged from the high pressure turbine (3) is used to drive turbines (41, 43) for compressors (42, 44) that compress the CO.sub.2, and a refrigerant for cooling the CO.sub.2, and steam (45) discharged from the compressor turbines is supplied as a heating source to the reboiler (30) for the regeneration of the CO.sub.2 -absorbing liquid.Type: GrantFiled: January 15, 1993Date of Patent: September 6, 1994Assignees: The Kansai Electric Power Co., Inc., Mitsubishi Jukogyo Kabushiki KaishaInventors: Masumi Fujii, Taiichiro Suda, Yoshitsugu Hotta, Kenji Kobayashi, Kunihiko Yoshida, Shigeru Shimojo, Mutsunori Karasaki, Masaki Iijima, Touru Seto, Shigeaki Mitsuoka
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Patent number: 5339633Abstract: An electric generating power plant and a method of operation thereof wherein the boiler (1) produces steam to a turbine driven-generator (2), carbon dioxide from combustion exhaust gas emitted from the boiler is simultaneously absorbed in an absorbing solution in an absorber (7), the absorbing solution with the absorbed carbon dioxide is passed through a regenerator (10) where the carbon dioxide is stripped from the absorbing solution, the regenerated absorbing solution is returned to the absorber (7), and steam from either the boiler (1) or turbine of the turbine-driven generator (2) is supplied to a reboiler (13) to provide heat for operation of the regenerator (10). During periods of high demand for electric power steam extraction from the boiler or turbine is discontinued, operation of the regenerator (10) is discontinued and the absorbing solution from the absorber (7) is stored in a first storage unit (15).Type: GrantFiled: October 7, 1992Date of Patent: August 23, 1994Assignees: The Kansai Electric Power Co., Ltd., Mitsubishi Jukogyo Kabushiki KaishaInventors: Masumi Fujii, Yoshitsugu Hotta, Taiichiro Suda, Kenji Kobayashi, Kunihiko Yoshida, Shigeru Shimojo, Mutsunori Karasaki, Masaki Iijima, Toru Seto, Shigeaki Mitsuoka
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Patent number: 5318758Abstract: An apparatus and a process for removing CO.sub.2 from a combustion exhaust gas, by effecting counterflow contact of aqueous alkanolamine solution with the combustion exhaust gas to absorb CO.sub.2 from the gas in the alkanolamine solution and effecting a further contact of the gas with either, condensate water formed by causing condensation of the gas after removal of CO.sub.2, or condensate water formed by causing condensation of the combustion exhaust gas directly after combustion of the fuel. The apparatus includes a tower (1), a first contact section (2) in the tower through which the exhaust gas flows upwardly in counterflow contact with the aqueous alkanolamine solution dispersed by a nozzle device (7) downstream of the first contact section (2), a second contact section (3) in the tower (1) downstream of the nozzle device (7) for effecting counterflow contact of reflux water from a spent absorbent liquor regenerating tower (28) with the gas after removal of CO.sub.2.Type: GrantFiled: March 9, 1992Date of Patent: June 7, 1994Assignees: Mitsubishi Jukogyo Kabushiki Kaisha, Kansai Electric Power Co., Inc.Inventors: Masumi Fujii, Yoshitsugu Hotta, Taiichiro Suda, Kenji Kobayashi, Kunihiko Yoshida, Shigeru Shimojo, Mutsunori Karasaki, Masaki Iijima, Fumio Tomikawa, Touro Seto, Shigeaki Mitsuoka