Patents by Inventor Hirochika Naganawa
Hirochika Naganawa 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: 11571634Abstract: A new system in which a forward extraction part, a scrubbing part, and a backward extraction part operate together and synchronously to produce specific substances by extraction and separation in a liquid-liquid system. The aqueous phase is circulated independently only in the forward extraction part one or more times, and the organic phase is circulated from the forward extraction part through the scrubbing part and the backward extraction part to the forward extraction part again in synchronization with the liquid circulation of the aqueous phase.Type: GrantFiled: June 17, 2020Date of Patent: February 7, 2023Assignee: Japan Atomic Energy AgencyInventors: Hirochika Naganawa, Tetsushi Nagano
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Publication number: 20220331751Abstract: [PROBLEMS] To provide a multistage apparatus used in a liquid-liquid system comprising two liquid phases that do not mix with each other, in which the position of the interface (liquid-liquid interface) of a heavy liquid phase and a light liquid does not fluctuate or else is suppressed, and a method of producing a specific substance using it. [SOLVING MEANS] An apparatus having a connected body of a plurality of adjacent containers or two or more stages installed in a single-piece container in which a plurality of partitions are arranged inside thereof, and a method of producing a specific substance using it.Type: ApplicationFiled: March 24, 2022Publication date: October 20, 2022Inventors: Hirochika NAGANAWA, Tetsushi NAGANO, Hideya SUZUKI
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Publication number: 20220016582Abstract: A method of forming a liquid-liquid mixing phase channel group, which has the steps of: ejecting the first liquid as droplets into the phase of the second liquid in a two-liquid phase system in which two immiscible liquids oppose each other at an interface; incorporating the droplets of the first liquid into the phase of the first liquid, accompanied by the second liquid around the first liquid by allowing to collide the jet of the droplets with the interface; and forming a continuously connected microfluidic channel group in which the space between the layered droplets of the first liquid are filled with the second liquid in the liquid-liquid mixing phase that grows from the interface as a starting point.Type: ApplicationFiled: April 1, 2021Publication date: January 20, 2022Inventors: Hirochika NAGANAWA, Tetsushi NAGANO
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Publication number: 20210197145Abstract: A nozzle for spouting a liquid phase, in which one liquid phase in a two-liquid phase system can be stably jetted as highly dispersible droplets while suppressing coalescence of droplets, and accumulation of fine solid components in the nozzle hardly occurs. The nozzle has a structure in which capillary tubes or pores are assembled. Further, the capillary tubes or the pores are formed using a suitable material having a low affinity for organic or a low affinity for water, or a material subjected to appropriate surface treatment.Type: ApplicationFiled: March 31, 2020Publication date: July 1, 2021Inventors: Hirochika NAGANAWA, Tetsushi NAGANO, Hirofumi ITO, Ryosuke SATO
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Publication number: 20200398185Abstract: A new system in which a forward extraction part, a scrubbing part, and a backward extraction part operate together and synchronously to produce specific substances by extraction and separation in a liquid-liquid system. The aqueous phase is circulated independently only in the forward extraction part one or more times, and the organic phase is circulated from the forward extraction part through the scrubbing part and the backward extraction part to the forward extraction part again in synchronization with the liquid circulation of the aqueous phase.Type: ApplicationFiled: June 17, 2020Publication date: December 24, 2020Inventors: Hirochika Naganawa, Tetsushi Nagano
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Patent number: 10494329Abstract: In synthesis of a compound represented by the General Formula (1) or a salt thereof, nitrilotriacetic acid as its raw material is reacted with a dehydrating agent to allow dehydration, and the resulting nitrilotriacetic acid anhydride is reacted with a dialkylamine to obtain a reaction intermediate product. The reaction intermediate product is then similarly reacted with a dehydrating agent to allow dehydration, and the resulting reaction intermediate anhydride is reacted with a dialkylamine to synthesize a tetraalkylnitriloacetic acid diacetamide compound. In Formula (1), R1, R2, R3 and R4 independently represent the same or different hydrocarbon group, with the proviso that the total number of carbon atoms in the hydrocarbon groups R1, R2, R3, and R4 is 8 to 64.Type: GrantFiled: September 14, 2018Date of Patent: December 3, 2019Assignee: JAPAN ATOMIC ENERGY AGENCYInventors: Kojiro Shimojo, Hirochika Naganawa
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Publication number: 20190092718Abstract: In synthesis of a compound represented by the General Formula (1) or a salt thereof, nitrilotriacetic acid as its raw material is reacted with a dehydrating agent to allow dehydration, and the resulting nitrilotriacetic acid anhydride is reacted with a dialkylamine to obtain a reaction intermediate product. The reaction intermediate product is then similarly reacted with a dehydrating agent to allow dehydration, and the resulting reaction intermediate anhydride is reacted with a dialkylamine to synthesize a tetraalkylnitriloacetic acid diacetamide compound. In Formula (1), R1, R2, R3 and R4 independently represent the same or different hydrocarbon group, with the proviso that the total number of carbon atoms in the hydrocarbon groups R1, R2, R3, and R4 is 8 to 64.Type: ApplicationFiled: September 14, 2018Publication date: March 28, 2019Applicant: JAPAN ATOMIC ENERGY AGENCYInventors: Kojiro SHIMOJO, Hirochika NAGANAWA
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Patent number: 9133100Abstract: A rare earth metal extractant containing, as the extractant component, dialkyldiglycol amide acid which is excellent in breaking down light rare earth elements is reacted in diglycolic acid (X mol) and an esterification agent (Y mol) at a reaction temperature of 70° C. or more and for a reaction time of one hour or more such that the mol ratio of Y/X is 2.5 or more, and is subjected to vacuum concentration. Subsequently, a reaction intermediate product is obtained by removing unreacted products and reaction residue. Then a nonpolar or low-polar solvent which is an organic solvent for forming an organic phase during solvent extraction of the rare earth metal and which is capable of dissolving dialkyldiglycol amide acid is added as the reaction solvent, and the reaction intermediate product is reacted with dialkyl amine (Z mol) such that the mol ratio of Z/X is 0.9 or more.Type: GrantFiled: July 1, 2011Date of Patent: September 15, 2015Assignees: SHIN-ETSU CHEMICAL CO., LTD., JAPAN ATOMIC ENERGY AGENCYInventors: Kazuaki Sakaki, Hiroto Sugahara, Tetsuya Kume, Masaki Ohashi, Hirochika Naganawa, Kojiro Shimojo
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Patent number: 9108124Abstract: The particle components may be collected by using a phenomenon that the particle components in the aqueous phase aggregate at the liquid-to-liquid interface. Both of the particle components and the dissolved components in the aqueous phase may be simultaneously collected if combined with liquid-liquid extraction phenomenon that the dissolved components in the aqueous phase are collected into the solvent phase through the liquid-to-liquid interface. The aggregation phenomenon of the particle components at the liquid-to-liquid interface may be promoted by using an emulsion flow method, a method of applying mechanical external forces (such as stirring and vibrating) or another method combining both the above-mentioned methods.Type: GrantFiled: June 19, 2012Date of Patent: August 18, 2015Assignee: Japan Atomic Energy AgencyInventors: Hirochika Naganawa, Nobuyuki Yanase, Tetsushi Nagano
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Patent number: 8889903Abstract: A rare earth metal extractant in the form of a dialkyl diglycol amic acid is synthesized by reacting diglycolic anhydride with a dialkylamine in an aprotic polar solvent, with a molar ratio of dialkylamine to diglycolic anhydride being at least 1.0, and removing the aprotic polar solvent.Type: GrantFiled: July 5, 2011Date of Patent: November 18, 2014Assignees: Shin-Etsu Chemical Co., Ltd., Nissin Chemical Industry Co., Ltd.Inventors: Kazuaki Sakaki, Hiroto Sugahara, Tetsuya Ohashi, Tetsuya Kume, Masahiko Ikka, Hirochika Naganawa, Kojiro Shimojo
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Patent number: 8841482Abstract: A rare earth metal extractant containing, as the extractant component, dialkyldiglycol amide acid which is excellent in breaking down light rare earth elements is reacted in diglycolic acid (X mol) and an esterification agent (Y mol) at a reaction temperature of 70° C. or more and for a reaction time of one hour or more such that the mol ratio of Y/X is 2.5 or more, and is subjected to vacuum concentration. Subsequently, a reaction intermediate product is obtained by removing unreacted products and reaction residue, and an aprotic polar solvent is added as the reaction solvent. Then, the reaction intermediate product is reacted with dialkyl amine (Z mol) such that the mol ratio of Z/X is 0.9 or more and the aprotic polar solvent is removed. As a consequence, a rare earth metal extractant is efficiently synthesized at a low cost and at a high yield without having to use expensive diglycolic acid anhydride and harmful dichloromethane.Type: GrantFiled: July 1, 2011Date of Patent: September 23, 2014Assignees: Shin-Etsu Chemical Co., Ltd., Japan Atomic Energy AgencyInventors: Kazuaki Sakaki, Hiroto Sugahara, Tetsuya Kume, Masaki Ohashi, Hirochika Naganawa, Kojiro Shimojo
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Patent number: 8519184Abstract: A rare earth metal extractant in the form of a dialkyl diglycol amic acid is synthesized by reacting diglycolic anhydride with a dialkylamine in a synthesis medium. A molar ratio (B/A) of dialkylamine (B) to diglycolic anhydride (A) is at least 1.0. A non-polar or low-polar solvent in which the dialkyl diglycol amic acid is dissolvable is used as the synthesis medium.Type: GrantFiled: July 5, 2011Date of Patent: August 27, 2013Assignees: Shin-Etsu Chemical Co., Ltd., Nissin Chemical Industry Co., Ltd.Inventors: Kazuaki Sakaki, Hiroto Sugahara, Tetsuya Ohashi, Tetsuya Kume, Masahiko Ikka, Hirochika Naganawa, Kojiro Shimojo
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Publication number: 20130123534Abstract: A rare earth metal extractant containing, as the extractant component, dialkyldiglycol amide acid which is excellent in breaking down light rare earth elements is reacted in diglycolic acid (X mol) and an esterification agent (Y mol) at a reaction temperature of 70° C. or more and for a reaction time of one hour or more such that the mol ratio of Y/X is 2.5 or more, and is subjected to vacuum concentration. Subsequently, a reaction intermediate product is obtained by removing unreacted products and reaction residue. Then a nonpolar or low-polar solvent which is an organic solvent for forming an organic phase during solvent extraction of the rare earth metal and which is capable of dissolving dialkyldiglycol amide acid is added as the reaction solvent, and the reaction intermediate product is reacted with dialkyl amine (Z mol) such that the mol ratio of Z/X is 0.9 or more.Type: ApplicationFiled: July 1, 2011Publication date: May 16, 2013Applicants: JAPAN ATOMIC ENERGY AGENCY, SHIN-ETSU CHEMICAL CO., LTD.Inventors: Kazuaki Sakaki, Hiroto Sugahara, Tetsuya Kume, Masaki Ohashi, Hirochika Naganawa, Kojiro Shimojo
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Publication number: 20130102806Abstract: A rare earth metal extractant containing, as the extractant component, dialkyldiglycol amide acid which is excellent in breaking down light rare earth elements is reacted in diglycolic acid (X mol) and an esterification agent (Y mol) at a reaction temperature of 70° C. or more and for a reaction time of one hour or more such that the mol ratio of Y/X is 2.5 or more, and is subjected to vacuum concentration. Subsequently, a reaction intermediate product is obtained by removing unreacted products and reaction residue, and an aprotic polar solvent is added as the reaction solvent. Then, the reaction intermediate product is reacted with dialkyl amine (Z mol) such that the mol ratio of Z/X is 0.9 or more and the aprotic polar solvent is removed. As a consequence, a rare earth metal extractant is efficiently synthesized at a low cost and at a high yield without having to use expensive diglycolic acid anhydride and harmful dichloromethane.Type: ApplicationFiled: July 1, 2011Publication date: April 25, 2013Applicants: JAPAN ATOMIC ENERGY AGENCY, SHIN-ETSU CHEMICAL CO., LTD.Inventors: Kazuaki Sakaki, Hiroto Sugahara, Tetsuya Kume, Masaki Ohashi, Hirochika Naganawa, Kojiro Shimojo
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Publication number: 20120255905Abstract: The particle components may be collected by using a phenomenon that the particle components in the aqueous phase aggregate at the liquid-to-liquid interface. Both of the particle components and the dissolved components in the aqueous phase may be simultaneously collected if combined with liquid-liquid extraction phenomenon that the dissolved components in the aqueous phase are collected into the solvent phase through the liquid-to-liquid interface. The aggregation phenomenon of the particle components at the liquid-to-liquid interface may be promoted by using an emulsion flow method, a method of applying mechanical external forces (such as stirring and vibrating) or another method combining both the above-mentioned methods.Type: ApplicationFiled: June 19, 2012Publication date: October 11, 2012Inventors: Hirochika Naganawa, Nobuyuki Yanase, Tetsushi Nagano
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Patent number: 8177881Abstract: Solvent extraction from an aqueous phase containing first and second rare earth elements is carried out by contacting an organic phase containing a diglycolamic acid as an extractant and a hydrocarbon or a low-polar alcohol as a solvent, with the aqueous phase below pH 3 for extracting the first rare earth element into the organic phase, back-extracting from the organic phase with an aqueous acid solution for recovering the first rare earth element, and recovering the second rare earth element which has not been extracted into the organic phase and has remained in the aqueous phase.Type: GrantFiled: June 11, 2010Date of Patent: May 15, 2012Assignees: Shin-Etsu Chemical Co., Ltd., Japan Atomic Energy AgencyInventors: Hiroto Sugahara, Kazuaki Sakaki, Takehisa Minowa, Hirochika Naganawa, Kojiro Shimojo
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Publication number: 20120043278Abstract: PROBLEM: To provide a novel paint waste liquid treatment method that is of simple construction, may be handled with ease, is easy to operate, and has good efficiency. SOLUTION MEANS: A method of treating waste liquid containing paint associated with the present invention is characterized in that at least one of either a treatment solution or a waste liquid containing paint is atomized and supplied in droplet form to a treatment tank, and a treatment solution phase and a waste liquid phase are mixed to produce flowing material in an emulsified state (a flowing emulsion), to treat said waste liquid. The present invention makes it possible for treatment of paint waste liquid to be carried out more simply and more easily than is the case with biological waste liquid treatment techniques, and makes it possible for treatment to be carried out at sites where waste liquid is generated. SELECTED DRAWING: FIG.Type: ApplicationFiled: July 14, 2010Publication date: February 23, 2012Inventors: Hirochika Naganawa, Nobuyuki Yanase, Tetsushi Nagano, Masaaki Hamada, Atsushi Sakamoto, Kohei Hamada
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Publication number: 20120004459Abstract: A rare earth metal extractant in the form of a dialkyl diglycol amic acid is synthesized by reacting diglycolic anhydride with a dialkylamine in an aprotic polar solvent, with a molar ratio of dialkylamine to diglycolic anhydride being at least 1.0, and removing the aprotic polar solvent.Type: ApplicationFiled: July 5, 2011Publication date: January 5, 2012Applicants: NISSIN CHEMICAL INDUSTRY CO., LTD., SHIN-ETSU CHEMICAL CO., LTD.Inventors: Kazuaki Sakaki, Hiroto Sugahara, Tetsuya Ohashi, Tetsuya Kume, Masahiko Ikka, Hirochika Naganawa, Kojiro Shimojo
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Publication number: 20120004458Abstract: A rare earth metal extractant in the form of a dialkyl diglycol amic acid is synthesized by reacting diglycolic anhydride with a dialkylamine in a synthesis medium. A molar ratio (B/A) of dialkylamine (B) to diglycolic anhydride (A) is at least 1.0. A non-polar or low-polar solvent in which the dialkyl diglycol amic acid is dissolvable is used as the synthesis medium.Type: ApplicationFiled: July 5, 2011Publication date: January 5, 2012Applicants: NISSIN CHEMICAL INDUSTRY CO., LTD., SHIN-ETSU CHEMICAL CO., LTD.Inventors: Kazuaki Sakaki, Hiroto Sugahara, Tetsuya Ohashi, Tetsuya Kume, Masahiko Ikka, Hirochika Naganawa, Kojiro Shimojo
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Publication number: 20100319491Abstract: Solvent extraction from an aqueous phase containing first and second rare earth elements is carried out by contacting an organic phase containing a diglycolamic acid as an extractant and a hydrocarbon or a low-polar alcohol as a solvent, with the aqueous phase below pH 3 for extracting the first rare earth element into the organic phase, back-extracting from the organic phase with an aqueous acid solution for recovering the first rare earth element, and recovering the second rare earth element which has not been extracted into the organic phase and has remained in the aqueous phase.Type: ApplicationFiled: June 11, 2010Publication date: December 23, 2010Applicants: SHIN-ETSU CHEMICAL CO., LTD., JAPAN ATOMIC ENERGY AGENCYInventors: Hiroto Sugahara, Kazuaki Sakaki, Takehisa Minowa, Hirochika Naganawa, Kojiro Shimojo