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Naganawa, Hirochika
Bunseki Kagaku, 66(11), p.797 - 808, 2017/11
Times Cited Count：6 Percentile：22.6(Chemistry, Analytical)A new liquid-liquid extraction method, called the emulsion-flow method, has recently been developed at Japan Atomic Energy Agency (JAEA). The emulsion-flow method, where low cost, simplicity, high efficiency, compactness, safety, and eco-friendly go together, has attracted attention, and has been expected to bring innovation to liquid-liquid extraction technologies. Compared with conventional industrial apparatuses, an emulsion-flow apparatus successfully combines the lowest cost superior to a spray column and the highest performance (the highest efficiency and the highest processing speed) comparable to a centrifugal extractor. Furthermore, the emulsion-flow method can also be used for collecting particulate components by utilizing their aggregation onto a liquid-liquid interface and for purifying water polluted by oil with its remarkable phase-separating ability.
Sugita, Tsuyoshi
Journal of Flow Injection Analysis, 33(1), p.39 - 40, 2016/06
A novel solvent extraction way, emulsion flow (EF) method, has been developed at JAEA. EF method achieves both good emulsion formation and quick phase separation only by solution sending. In this report, I referred Flow Injection Analysis (FIA) using solvent extraction as a preprocessing technique and introduced an outline of the EF method as such. Furthermore, I mentioned the application possibility of the EF method to the preprocessing in FIA with its advantage for extracting and concentrating a trace component from a large-volume sample.
Kanda, Nobuhiro; Daiten, Masaki; Endo, Yuji; Yoshida, Hideaki; Mita, Yutaka; Naganawa, Hirochika; Nagano, Tetsushi; Yanase, Nobuyuki
JAEA-Technology 2015-007, 43 Pages, 2015/03
JAEA-Technology-2015-007.pdf:5.33MB
The centrifuge which has the subtlety information concerning the nuclear nonproliferation used for uranium enrichment technical development exists in the uranium enrichment facilities of Ningyo-toge Environmental Engineering Center, Japan Atomic Energy Agency. This centrifugal is performing separation processing of the radioactive material adhering to the surface of parts by wet decontamination of ultrasonic cleaning by dilute sulfuric acid and water, etc. By removing the uranium contained in waste fluid, generated sludge reduces activity concentration. And the possibility of reduction of sludge processing is examined. For this reason, from the 2007 fiscal year, Nuclear Science and Engineering Directorate and cooperation are aimed at, and development of the extraction separation technology of the "uranium" by the emulsion flow method is furthered. The test equipment using the developed emulsion flow method was tested. And dilute sulfuric acid and water were used for the examination as actual waste fluid. The result checked whether the various performances in Basic test carried out in Nuclear Science and Engineering Directorate would be obtained.
Shimojo, Kojiro
Kagaku Kogaku, 78(7), P. 501, 2014/07
no abstracts in English
Naganawa, Hirochika
no journal, ,
no abstracts in English
Naganawa, Hirochika
no journal, ,
By the request from Nuclear Cycle Backend Directorate, an innovative chemical separation technique for radioactive materials and metals, Emulsion-flow method, will be introduced in the seminar at Rokkasho-mura titled Rokkasho Nuclear Fuel Cycle Seminar.
Naganawa, Hirochika
no journal, ,
Liquid-liquid extraction (solvent extraction) is a method for extracting a target component from an aqueous solution into an organic solvent immiscible in water, which is very popular in industry especially in metal refining. In the emulsion flow extractor, the flow of an emulsion, which is a fine mixture of aqueous and organic phases, arises by generating micrometer-sized liquid droplets with a nozzle head, and the emulsion flow then promptly disappears by itself with a drastic change of the cross-section area of its passing in the extractor vessel structure. In short, aqueous and organic phases can be effectively mixed to an emulsified condition and then these two liquid phases can be quickly separated to their perfectly clear condition by only sending liquids. Therefore, the emulsion flow extractor is markedly low-cost and simple compared with conventional apparatuses (mixer-settler, etc.) despite showing the highest performance.
Naganawa, Hirochika; Yanase, Nobuyuki; Nagano, Tetsushi
no journal, ,
In this symposium, the experimental result of solvent extraction of Yb (one of the rare earth elements) and collection of Al
O
solid particles at the same time by using "emulsion flow" method is introduced. The emulsion flow method, that enables simultaneous removal of dissolved and solid components, simply, rapidly and efficiently, was found to be applied to purifying wastewater of automotive aqueous paints.
Naganawa, Hirochika; Nagano, Tetsushi; Yanase, Nobuyuki*
no journal, ,
A new liquid-liquid extraction apparatus, named, emulsion-flow extractor, where low cost, simplicity, compactness, high processing speed, high efficiency, and safety go together, is introduced. The emulsion-flow technique can actualize very efficient liquid-liquid extraction with its high two-phase mixing ability to an emulsion by spraying micrometer-sized oil droplets into a counter-current aqueous solution. Meanwhile, this technology can also actualize more than tenfold processing speed in its very rapid phase separation and less than one fifth cost with its very simple structure workable by only solution sending in comparison with mixer-settler that is the most popular industrial liquid-liquid extraction technique. In addition, the emulsion-flow extractor having no drive part in its main body has less trouble and is safer than the conventional extractor.
Naganawa, Hirochika; Tanaka, Mikiya*; Saki, Yukinori*
no journal, ,
Electroless nickel plating is an important surface finishing technology; however, the treatment of a large amount of spent baths should be established from both the environmental and economic viewpoints. Solvent extraction is a useful separation technology which utilizes the distribution of a solute between aqueous and organic phases. The present authors have developed a nickel recycling process from the spent baths using solvent extraction. This process was applied to a plating plant initially using a conventional mixer-settler and then a new apparatus called emulsion flow extractor. In this presentation, the laboratory-scale experimental results and practical operation data will be presented.
Hirayama, Mikiro; Naganawa, Hirochika; Nagano, Tetsushi; Nii, Susumu*
no journal, ,
no abstracts in English
長縄 弘親; 永野 哲志
not registered
JP, 2019-113657 Patent licensing information Patent publication (In Japanese)
【課題】正抽出部100、洗浄部200、及び逆抽出部300が一体となり同期して機能する循環送液システムにおいて、複数回の循環回数によって発現する多段に相当する効果を利用して分離精製される特定の物質の製造方法を提供すること。 【解決手段】正抽出部100、洗浄部200、及び逆抽出部300が一体化して同期的に機能するシステムを用いて、正抽出部100の水相(多くの場合、重液相)が正抽出部100のみの単独部内で循環送液すると同時に、正抽出部100の油相(多くの場合、軽液相)が洗浄部200から逆抽出部300を経て再び正抽出部100に至る横断的な循環送液を行うように制御し、正抽出部100の水相の単独部内循環を複数回行うことによって分離精製される特定の物質の製造方法。
長縄 弘親; 永野 哲志
伊藤 博文*; 佐藤 亮介*
JP, 2019-125457 Patent licensing information
【課題】2液相系において、一方の液相を分散性の高い液滴として、液滴同士の合一を抑制しながら安定的に噴出させるとともに、微細な固形成分の蓄積が起こりにくいエマルション発生用ノズルを提供することである。 【解決手段】エマルション発生用ノズルとして、細管又は細孔を集合させた構造を持つノズルを用いることで、ノズル内への微細な固形成分の蓄積が起こりにくく、また、疎水性又は疎有機性を有する適切な材料あるいは適切な表面加工を施した材料を用いて形成させた細管又は細孔を集合させた構造体を利用すれば、液滴同士の合一を抑制しながら、2液相系において一方の液相を分散性の高い液滴として他方の液相内に安定的に噴出させることができる。
長縄 弘親; 永野 哲志
not registered
JP, 2019-234265 Patent licensing information Patent publication (In Japanese)
【課題】正抽出部100、洗浄部200、及び逆抽出部300が一体となり同期して機能する循環送液システムにおいて、複数回の循環回数によって発現する多段に相当する効果を利用して分離精製される特定物質の製造装置を提供すること。 【解決手段】正抽出部100、洗浄部200、及び逆抽出部300が一体化して同期的に機能する構成を備え、正抽出部100の水相(多くの場合、重液相)が正抽出部100のみの単独部内で循環送液すると同時に、正抽出部100の油相(多くの場合、軽液相)が洗浄部200から逆抽出部300を経て再び正抽出部100に至る横断的な循環送液を行うように構成され、正抽出部100の水相の単独部内循環を複数回行うことによって分離精製される特定物質を得る。
長縄 弘親; 永野 哲志; 鈴木 英哉
not registered
JP, 2021-069670 Patent licensing information
【課題】互いに混じり合わない2つの液相から成る液液系において、重液相と軽液相が成す界面(液液界面)の位置が変動しない又は変動が抑制される多段の装置及びそれを用いた特定物質の製造方法を提供する。 【解決手段】隣接した複数の容器の連結体又は複数の仕切りを配した一体構造の容器に設置された2つ以上の段において、重液相が容器下部において連通しているか、若しくは軽液相が容器上部において連通しているか、又はその両方である仕組みを利用し、重液相と軽液相が成す界面(液液界面)の位置が変動しない又は変動が抑制されるように多段抽出を行う装置及びそれを用いた特定物質の製造方法。
