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Nakajima, Hayato*; Imai, Yoshiyuki; Kubo, Shinji
JAEA-Technology 2009-082, 35 Pages, 2010/08
Concerning the thermochemical water-splitting Iodine-Sulfur process, understanding of solution compositions on 2 liquid phase separation is essential for making good choices of operating conditions and for accurate estimations of thermal efficiency. The compositions of 4-component system composed of HI, HSO
, I
and H
O were examined experimentally and were analysed by a 3-dimensional visualization technique. A chemical titration method was adapted to determine the mole fractions of the solutions at 293 K and 363 K, and the fraction were represented by scattered points in an equilateral tetrahedron. Two valuable features were found from a visualized shape viewed as an aggregate of the points, which were difficult to find out by 2-dimensional presentations.
Imai, Yoshiyuki; Nakajima, Hayato; Kubo, Shinji; Onuki, Kaoru
Kagaku Kogaku Rombunshu, 36(1), p.70 - 73, 2010/01
Times Cited Count:5 Percentile:22.56(Engineering, Chemical)Effect of sulfur dioxide partial pressure and reaction temperature on the composition of the poly-hydriodic acid solution produced in the Bunsen reaction, which is a unit reaction in the IS process for thermochemical hydrogen production, was studied experimentally under iodine saturation. The ratio of (HI/(HI/HO)) of the poly-hydriodic acid solution assuming an ideal desulfurization was increased with sulfur dioxide partial pressure and reaction temperature. The experimental equation on the ratio of (HI/(HI/H
O)) was obtained as a function of sulfur dioxide partial pressure and reaction temperature.
Kubo, Shinji; Nakajima, Hayato; Imai, Yoshiyuki; Kasahara, Seiji; Tanaka, Nobuyuki; Okuda, Hiroyuki; Miyashita, Reiko*; Onuki, Kaoru
Proceedings of 17th World Hydrogen Energy Conference (WHEC 2008) (CD-ROM), 4 Pages, 2008/06
A new technique was developed to estimate compositions of Bunsen reaction solution in liquid-liquid phase separation which was targeted on the two solutions in phase equilibrium. In this technique, just two densities measured in the two solution are employed to estimate compositions of two solutions consisting of HI, HSO
, I
, H
O. The fundamental equations underlying this estimation is relations between densities and compositions. To formulate the relations, densities of simulated Bunsen reaction solutions were measured and regression expressions were formulated. Moreover, relational equations for both phases were set up from measured values by the regression procedure. Through estimations of both compositions from both densities, the calculated values are approximately consistent with titrated values. Because of easily and simply execution, this technique is useful for practical use, especially for plant operation and equipment design.
Kubo, Shinji; Nakajima, Hayato; Imai, Yoshiyuki; Kasahara, Seiji; Onuki, Kaoru
Proceedings of 2007 AIChE Annual Meeting (CD-ROM), 5 Pages, 2007/11
no abstracts in English
Nakajima, Hayato; Imai, Yoshiyuki; Kasahara, Seiji; Kubo, Shinji; Onuki, Kaoru
Kagaku Kogaku Rombunshu, 33(3), p.257 - 260, 2007/05
Times Cited Count:5 Percentile:24.32(Engineering, Chemical)Effect of sulfur dioxide partial pressure on the reaction of iodine, sulfur dioxide and water, which is a unit reaction of thermochemical hydrogen production IS process, was studied experimentally at 323K under iodine saturated condition. Quasi-equilibrium state was observed in the presence of sulfur dioxide gas of constant pressure. The composition of the poly-hydriodic acid solution was discussed assuming an ideal desulfurization using the reverse reaction of the Bunsen reaction. The value of HI/(HI+HO) of the desulfurized solution was high in great sulfur dioxide pressure and reached the maximum of 15.7
0.3 mol%.
Kubo, Shinji; Nakajima, Hayato; Kasahara, Seiji; Higashi, Shunichi*; Masaki, Tomoo*; Abe, Hiroyoshi*; Onuki, Kaoru
Nuclear Engineering and Design, 233(1-3), p.347 - 354, 2004/10
Times Cited Count:190 Percentile:99.52(Nuclear Science & Technology)no abstracts in English
Kasahara, Seiji; Hwang, G.*; Nakajima, Hayato; Choi, H.*; Onuki, Kaoru; Nomura, Mikihiro
Journal of Chemical Engineering of Japan, 36(7), p.887 - 899, 2003/07
Times Cited Count:69 Percentile:88.15(Engineering, Chemical)Thermal efficiency of the IS thermochemical hydrogen production process was evaluated. Sensitivities of operation conditions (HI conversion ratio, pressure and reflux ratio at HI distillation and concentration of HI after EED) and nonidealities of the process (electric energy loss in EED, loss at heat exchangers and loss of waste heat recovery as electricity) were investigated. Concentration of HI after EED had the most significant effect of 13.3 % on thermal efficiency in operation conditions. Nonidealities had importance on thermal efficiency. Thermal efficiency was 56.8 % with optimized operation conditions and no nonidealities.
Onuki, Kaoru; Akino, Norio; Shimizu, Saburo; Nakajima, Hayato; Higashi, Shunichi; Kubo, Shinji
JAERI-Tech 2001-032, 63 Pages, 2001/03
no abstracts in English
Higashi, Shunichi; Nakajima, Hayato; Kubo, Shinji; Onuki, Kaoru; Inagaki, Yoshiyuki; Shimizu, Saburo; Akino, Norio
Proceedings of the Seminar on HTGR Application and Development, p.164 - 175, 2001/03
no abstracts in English
Kubo, Shinji; Nakajima, Hayato; Onuki, Kaoru; Shimizu, Saburo
Dai-7-Kai Doryoku Enerugi Gijutsu Shimpojiumu Koen Rombunshu (00-11), p.293 - 298, 2000/11
no abstracts in English
Ioka, Ikuo; Onuki, Kaoru; Futakawa, Masatoshi; Kuriki, Yoshiro*; Nagoshi, Masayasu*; Nakajima, Hayato; Shimizu, Saburo
Ryusan To Kogyo, 52(4), p.1 - 6, 1999/04
no abstracts in English
; Nakajima, Hayato; Onuki, Kaoru; Ikenoya, Kazuhiko*; Shimizu, Saburo
International Journal of Hydrogen Energy, 24(7), p.603 - 612, 1999/00
Times Cited Count:41 Percentile:80.87(Chemistry, Physical)no abstracts in English
Nakajima, Hayato; Ikenoya, Kazuhiko*; Onuki, Kaoru; Shimizu, Saburo
Kagaku Kogaku Rombunshu, 24(2), p.352 - 355, 1998/00
Times Cited Count:52 Percentile:87.12(Engineering, Chemical)no abstracts in English
Ioka, Ikuo; Onuki, Kaoru; Futakawa, Masatoshi; Kuriki, Yoshiro*; ; Nakajima, Hayato; Shimizu, Saburo
Zairyo, 46(9), p.1041 - 1045, 1997/09
no abstracts in English
Onuki, Kaoru; ; Nakajima, Hayato; Shimizu, Saburo
J. Chem. Eng. Jpn., 30(2), p.359 - 362, 1997/00
Times Cited Count:3 Percentile:35.06(Engineering, Chemical)no abstracts in English
Onuki, Kaoru; Nakajima, Hayato; Shimizu, Saburo
Kagaku Kogaku Rombunshu, 23(2), p.289 - 291, 1997/00
Times Cited Count:8 Percentile:47.98(Engineering, Chemical)no abstracts in English
Futakawa, Masatoshi; Onuki, Kaoru; Ioka, Ikuo; Nakajima, Hayato; Shimizu, Saburo; Kuriki, Yoshiro*; Nagoshi, Masayasu*
Zairyo To Kankyo, 46(10), p.669 - 674, 1997/00
no abstracts in English
Onuki, Kaoru; Ioka, Ikuo; Futakawa, Masatoshi; Nakajima, Hayato; Shimizu, Saburo;
Zairyo To Kankyo, 46(2), p.113 - 117, 1997/00
no abstracts in English
Onuki, Kaoru; Nakajima, Hayato; Ioka, Ikuo; Futakawa, Masatoshi; Shimizu, Saburo
JAERI-Review 94-006, 53 Pages, 1994/11
no abstracts in English
Onuki, Kaoru; Shimizu, Saburo; Nakajima, Hayato; Ikezoe, Yasumasa; Sato, Shoichi
International Journal of Hydrogen Energy, 15(2), p.93 - 97, 1990/00
Times Cited Count:0 Percentile:0.00(Chemistry, Physical)no abstracts in English