Patents by Inventor Yukishige Maezawa
Yukishige Maezawa 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: 11278842Abstract: Disclosed herein are acid gas absorbents that afford high acid gas (CO2) absorption amount per unit volume and high absorption speed and can prevent the absorbent components from diffusing.Type: GrantFiled: August 20, 2020Date of Patent: March 22, 2022Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATIONInventors: Shinji Murai, Yukishige Maezawa, Tetsuya Kaseda, Takehiko Muramatsu, Satoshi Saito, Mitsuru Udatsu, Daigo Muraoka, Masatoshi Hodotsuka
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Publication number: 20200376428Abstract: Disclosed herein are acid gas absorbents that afford high acid gas (CO2) absorption amount per unit volume and high absorption speed and can prevent the absorbent. components from diffusing.Type: ApplicationFiled: August 20, 2020Publication date: December 3, 2020Applicants: KABUSHIKI KASSHA TOSHIBA, TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATIONInventors: Shinji MURAI, Yukishige MAEZAWA, Tetsuya KASEDA, Takehiko MURAMATSU, Satoshi SAITO, Mitsuru UDATSU, Daigo MURAOKA, Masatoshi HGDOTSUKA
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Patent number: 10850227Abstract: Disclosed herein are acid gas absorbents that afford high acid gas (CO2) absorption amount per unit volume and high absorption speed and can prevent the absorbent components from diffusing. Also disclosed herein is a method and device for removing an acid gas, in which the energy required for separating the acid gas and regenerating the absorbent is reduced, are provided.Type: GrantFiled: November 27, 2018Date of Patent: December 1, 2020Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATIONInventors: Shinji Murai, Yukishige Maezawa, Tetsuya Kaseda, Takehiko Muramatsu, Satoshi Saito, Mitsuru Udatsu, Daigo Muraoka, Masatoshi Hodotsuka
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Publication number: 20190160422Abstract: Disclosed herein are acid gas absorbents that afford high acid gas (CO2) absorption amount per unit volume and high absorption speed and can prevent the absorbent components from diffusing. Also disclosed herein is a method and device for removing an acid gas, in which the energy required for separating the acid gas and regenerating the absorbent is reduced, are provided.Type: ApplicationFiled: November 27, 2018Publication date: May 30, 2019Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATIONInventors: Shinji Murai, Yukishige Maezawa, Tetsuya Kaseda, Takehiko Muramatsu, Satoshi Saito, Mitsuru Udatsu, Daigo Muraoka, Masatoshi Hodotsuka
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Patent number: 10046269Abstract: There are provided an acidic gas absorbing agent that is large in recovery amount of an acidic gas. The acidic gas absorbing agent comprising an amine compound represented by general formula (1), and an acidic gas removing method and an acidic gas removing apparatus using the absorbing agent: wherein R1 represents a cycloalkyl group having 3 to 6 carbon atoms; R2 represents an alkyl group having 1 to 3 carbon atoms or a hydrogen atom; R3 and R4 each independently represent an alkyl group having 1 to 3 carbon atoms or a hydrogen atom; and R5 represents an alkyl group having 1 to 3 carbon atoms.Type: GrantFiled: April 4, 2016Date of Patent: August 14, 2018Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Shinji Murai, Yasuhiro Kato, Takehiko Muramatsu, Satoshi Saito, Daigo Muraoka, Yukishige Maezawa
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Patent number: 9724642Abstract: An acid gas absorbent includes at least one kind of secondary amine compound represented by formula (1): where R1 is a cyclopentyl group or a cyclohexyl group which may be substituted by a substituted or non-substituted alkyl group having 1 to 3 carbon atoms, R2 and R3 each indicate an alkylene group having 2 to 4 carbon atoms, and R2 and R3 may each be the same or different, and be a straight chain or have a side chain.Type: GrantFiled: November 28, 2014Date of Patent: August 8, 2017Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Shinji Murai, Yukishige Maezawa, Yasuhiro Kato, Takehiko Muramatsu, Masatoshi Hodotsuka, Satoshi Saito
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Publication number: 20160296882Abstract: There are provided an acidic gas absorbing agent that is large in recovery amount of an acidic gas. The acidic gas absorbing agent comprising an amine compound represented by general formula (1), and an acidic gas removing method and an acidic gas removing apparatus using the absorbing agent: wherein R1 represents a cycloalkyl group having 3 to 6 carbon atoms; R2 represents an alkyl group having 1 to 3 carbon atoms or a hydrogen atom; R3 and R4 each independently represent an alkyl group having 1 to 3 carbon atoms or a hydrogen atom; and R5 represents an alkyl group having 1 to 3 carbon atoms.Type: ApplicationFiled: April 4, 2016Publication date: October 13, 2016Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Shinji MURAI, Yasuhiro KATO, Takehiko MURAMATSU, Satoshi SAITO, Daigo MURAOKA, Yukishige MAEZAWA
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Patent number: 9409119Abstract: An acid gas absorbent of which recovery amount of acid gas such as carbon dioxide is high, and an acid gas removal device and an acid gas removal method using the acid gas absorbent are provided. The acid gas absorbent of the embodiment comprising at least one type of tertiary amine compound represented by the following general formula (1). (In the above-stated formula (1), either one of the R1, R2 represents a substituted or non-substituted alkyl group of which carbon number is 2 to 5, and the other one represents a substituted or non-substituted alkyl group of which carbon number is 1 to 5. The R3 represents a methyl group or an ethyl group, and the R4 represents a hydroxyalkyl group. The R1, R2 may either be the same or different, and they may be coupled to form a cyclic structure.Type: GrantFiled: December 20, 2011Date of Patent: August 9, 2016Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Shinji Murai, Yukishige Maezawa, Yasuhiro Kato, Takehiko Muramatsu, Satoshi Saito, Hiroko Watando, Naomi Shida, Reiko Yoshimura, Takashi Kuboki
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Publication number: 20150298054Abstract: The CO2 recovery apparatus 10A includes: an absorption tower 11 in which a discharge gas 21 is contacted with a second lean solution 22B to allow the second lean solution 22B to absorb CO2; a temperature regulator 12 in which a first rich solution 23A discharged from the absorption tower is heated or cooled to allow the first rich solution 23A to be a solution in which a precipitate containing the reaction accelerator is dispersed; a phase separator 13 in which a second rich solution 23B passed through the temperature regulator 12 is separated into an amino group-containing compound rich phase 31 and a reaction accelerator rich phase 32; a regeneration tower 15 in which a third rich solution 23C is regenerated; and a solution mixing line L13A through which a reaction accelerator rich solution 34 is supplied to a first lean solution 22A discharged from the regeneration tower 15.Type: ApplicationFiled: March 25, 2015Publication date: October 22, 2015Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Daigo MURAOKA, Shinji Murai, Yukishige Maezawa, Masatoshi Hodotsuka
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Publication number: 20150151246Abstract: An acid gas absorbent according to an embodiment includes at least one kind of secondary amine compound represented by the following general formula (1). In the above-described formula (1), R1 indicates a cyclopenthyl group or a cyclohexyl group in which a part of a hydrogen atom may be substituted by a substituted or non-substituted alkyl group having 1 to 3 carbon atoms, R2 and R3 each indicate an alkylene group having 2 to 4 carbon atoms, and, R2 and R3 may each be the same or different, and be a straight chain or have a side chain.Type: ApplicationFiled: November 28, 2014Publication date: June 4, 2015Applicant: Kabushiki Kaisha ToshibaInventors: Shinji MURAI, Yukishige MAEZAWA, Yasuhiro KATO, Takehiko MURAMATSU, Masatoshi HODOTSUKA, Satoshi SAITO
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Publication number: 20150044114Abstract: An acid gas absorbent according to an embodiment includes at least one kind of amino acid salt represented by the following general formula (1). In the above-described formula (1), R1 indicates a cyclic alkyl group having 3 to 8 carbon atoms, R2 indicates a cyclic alkyl group having 3 to 8 carbon atoms, a chain alkyl group having 1 to 8 carbon atoms, or a hydrogen atom, R3 indicates a methylene group, an alkylene group having 2 to 4 carbon atoms, an alkylidene group having 2 to 4 carbon atoms, or a polymethylene group having 3 to 4 carbon atoms, and M indicates alkali metal.Type: ApplicationFiled: August 4, 2014Publication date: February 12, 2015Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Shinji MURAI, Yasuhiro KATO, Yukishige MAEZAWA, Takehiko MURAMATSU, Daigo MURAOKA, Satoshi SAITO
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Publication number: 20130343974Abstract: An acid gas absorbent comprising at least one type of diamine compound represented by the following general formula (1), R1R2N—(CHR3)n—CH2—NR4R5??(1), where R1, R2, R4 and R5 represent any of: a cyclic alkyl group having carbon number from 3 to 6; an alkyl group having carbon number from 1 to 4; a hydroxyalkyl group; and a hydrogen atom, R3 represents any of: the hydrogen atom; a methyl group; and an ethyl group, “n” represents an integer number of 1 or 2, at least one of two amino groups is a secondary amino group, both of the two amino groups are groups other than a primary amino group.Type: ApplicationFiled: June 20, 2013Publication date: December 26, 2013Inventors: Shinji MURAI, Yukishige MAEZAWA, Yasuhiro KATO, Takehiko MURAMATSU, Masatoshi HODOTSUKA, Satoshi SAITO
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Publication number: 20130276631Abstract: This invention relates to a method for removing carbon dioxide in an exhaust gas utilizing seawater, and to apparatuses for removing carbon dioxide by the method. The method includes producing a concentrated seawater having an increased concentration of salt by utilizing a reverse osmosis membrane method, producing an ammonia-saturating concentrated seawater by blowing ammonia into the concentrated seawater, contacting a non-heated exhaust gas with the ammonia-saturating concentrated seawater such that carbon dioxide is absorbed in the ammonia-saturating concentrated seawater, collecting a sediment of sodium hydrogen carbonate, and collecting ammonium chloride from a solution comprising the ammonium chloride produced by absorption of the carbon dioxide in the ammonium-saturating concentrated seawater.Type: ApplicationFiled: June 18, 2013Publication date: October 24, 2013Inventors: Kenji SANO, Yukishige Maezawa, Toru Ushirogouchi
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Patent number: 8545783Abstract: There is provided an acid gas absorbent having excellent performance of absorbing acid gas such as carbon dioxide, and an acid gas removal device and an acid gas removal method using the acid gas absorbent. An acid gas absorbent of an embodiment contains at least one type of tertiary amine compound represented by the following general formula (1). (In the above formula (1), the cycle A represents a cyclic structure whose carbon number is not less than 3 nor more than 8. R1, R2 and R3 each represent an alkyl group whose carbon number is 1 to 4, and R4 represents a hydroxyalkyl group. R1 and R2 are groups coupled to carbon atoms adjacent to a carbon atom forming the cycle A and coupled to a nitrogen atom.Type: GrantFiled: May 18, 2012Date of Patent: October 1, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Shinji Murai, Yukishige Maezawa, Yasuhiro Kato, Takehiko Muramatsu, Masatoshi Hodotsuka
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Patent number: 8506913Abstract: An acidic gas absorbent having a high acidic gas absorption capacity, that is, a high acidic gas absorption amount and a high acidic gas absorption rate, an acidic gas absorption device, and a method for absorbing an acidic gas, are provided. An acidic gas absorbent containing an azabicyclo compound and a primary or secondary amine compound; an acidic gas absorbent containing a heteroaromatic ring compound and a primary or secondary amine compound; an acidic gas removal device using these acidic gas absorbents; and a method for removing an acidic gas are disclosed.Type: GrantFiled: March 29, 2010Date of Patent: August 13, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Shinji Murai, Satoshi Saito, Yasuhiro Kato, Takehiko Muramatsu, Takashi Kuboki, Hiroko Watando, Asato Kondo, Yukishige Maezawa
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Patent number: 8486182Abstract: According to one embodiment, a method for removing carbon dioxide in an exhaust gas utilizing seawater includes: blowing ammonia into seawater to produce ammonia-saturated seawater; contacting an exhaust gas under a state of non-heat with the ammonia-saturated seawater so that carbon dioxide in the exhaust gas is absorbed in the ammonia-saturated seawater; and splaying a solution containing sodium hydrogen carbonate and ammonium chloride which are produced through absorption of the carbon dioxide by the ammonia-saturated seawater utilizing pressure of the exhaust gas while cooling the solution utilizing heat of evaporation of a solvent of the solution so as to settle out and recover the sodium hydrogen carbonate and the ammonium chloride.Type: GrantFiled: August 12, 2011Date of Patent: July 16, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Kenji Sano, Yukishige Maezawa, Toru Ushirogouchi
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Publication number: 20120305840Abstract: An object of the present invention is to provide a carbon dioxide absorbing solution capable of avoiding precipitation of a product formed by the reaction with carbon dioxide. The absorbing solution is an aqueous solution characterized by containing an amino acid salt comprising at least one carboxylic acid salt connected to a heterocyclic ring including at least one nitrogen atom as the ring member atom.Type: ApplicationFiled: September 24, 2009Publication date: December 6, 2012Applicant: Kabushiki Kaisha ToshibaInventors: Shinji Murai, Satoshi Saito, Takehiko Muramatsu, Yukishige Maezawa, Takashi Kuboki, Yasuhiro Kato, Reiko Yoshimura, Hiroko Watando, Asato Kondo
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Publication number: 20120308451Abstract: There is provided an acid gas absorbent having excellent performance of absorbing acid gas such as carbon dioxide, and an acid gas removal device and an acid gas removal method using the acid gas absorbent. An acid gas absorbent of an embodiment contains at least one type of tertiary amine compound represented by the following general formula (1). (In the above formula (1), the cycle A represents acyclic structure whose carbon number is not less than 3 nor more than 8. R1, R2 and R3 each represent an alkyl group whose carbon number is 1 to 4, and R4 represents a hydroxyalkyl group. R1 and R2 are groups coupled to carbon atoms adjacent to a carbon atom forming the cycle A and coupled to a nitrogen atom.Type: ApplicationFiled: May 18, 2012Publication date: December 6, 2012Inventors: Shinji MURAI, Yukishige Maezawa, Yasuhiro Kato, Takehiko Muramatsu, Masatoshi Hodotsuka
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Publication number: 20120294785Abstract: An acidic gas absorbent having a high acidic gas absorption capacity, that is, a high acidic gas absorption amount and a high acidic gas absorption rate, an acidic gas absorption device, and a method for absorbing an acidic gas, are provided. An acidic gas absorbent containing an azabicyclo compound and a primary or secondary amine compound; an acidic gas absorbent containing a heteroaromatic ring compound and a primary or secondary amine compound; an acidic gas removal device using these acidic gas absorbents; and a method for removing an acidic gas are disclosed.Type: ApplicationFiled: March 29, 2010Publication date: November 22, 2012Applicant: Kabushiki Kaisha ToshibaInventors: Shinji Murai, Satoshi Saito, Yasuhiro Kato, Takehiko Muramatsu, Takashi Kuboki, Hiroko Watando, Asato Kondo, Yukishige Maezawa
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Publication number: 20120161071Abstract: An acid gas absorbent of which recovery amount of acid gas such as carbon dioxide is high, and an acid gas removal device and an acid gas removal method using the acid gas absorbent are provided. The acid gas absorbent of the embodiment comprising at least one type of tertiary amine compound represented by the following general formula (1). (In the above-stated formula (1), either one of the R1, R2 represents a substituted or non-substituted alkyl group of which carbon number is 2 to 5, and the other one represents a substituted or non-substituted alkyl group of which carbon number is 1 to 5. The R3 represents a methyl group or an ethyl group, and the R4 represents a hydroxyalkyl group. The R1, R2 may either be the same or different, and they may be coupled to form a cyclic structure.Type: ApplicationFiled: December 20, 2011Publication date: June 28, 2012Inventors: Shinji MURAI, Yukishige Maezawa, Yasuhiro Kato, Takehiko Muramatsu, Satoshi Saito, Hiroko Watando, Naomi Shida, Reiko Yoshimura, Takashi Kuboki