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JAEA Reports

An Analysis of composition distributions for 2 liquid phase separation solution composed of HI, H$$_{2}$$SO$$_{4}$$, I$$_{2}$$ and H$$_{2}$$O by 3-dimensional visualization

Nakajima, Hayato*; Imai, Yoshiyuki; Kubo, Shinji

JAEA-Technology 2009-082, 35 Pages, 2010/08

JAEA-Technology-2009-082.pdf:2.74MB

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, H$$_{2}$$SO$$_{4}$$, I$$_{2}$$ and H$$_{2}$$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.

Journal Articles

Effect of sulfur dioxide partial pressure and reaction temperature on the product composition of the Bunsen reaction

Imai, Yoshiyuki; Nakajima, Hayato; Kubo, Shinji; Onuki, Kaoru

Kagaku Kogaku Rombunshu, 36(1), p.70 - 73, 2010/01

 Times Cited Count:5 Percentile:73.91(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/H$$_{2}$$O)) 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$$_{2}$$O)) was obtained as a function of sulfur dioxide partial pressure and reaction temperature.

Journal Articles

An Estimation technique for compositions of bunsen reaction solutions on thermochemical water splitting is process

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, H$$_{2}$$SO$$_{4}$$, I$$_{2}$$, H$$_{2}$$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.

Journal Articles

Control techniques for Bunsen reaction solution to regulate process condition

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

Journal Articles

Effect of sulfur dioxide partial pressure on the reaction of iodine, sulfur dioxide and water

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:73.3(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+H$$_{2}$$O) of the desulfurized solution was high in great sulfur dioxide pressure and reached the maximum of 15.7$$pm$$0.3 mol%.

Journal Articles

Effects of process parameters of the IS process on total thermal efficiency to produce hydrogen from water

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:59 Percentile:11.94(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.

JAEA Reports

Safety considerations for continuous hydrogen production test apparatus wtih capacity of 50 N-litter hydrogen per hour

Onuki, Kaoru; Akino, Norio; Shimizu, Saburo; Nakajima, Hayato; Higashi, Shunichi; Kubo, Shinji

JAERI-Tech 2001-032, 63 Pages, 2001/03

JAERI-Tech-2001-032.pdf:4.63MB

no abstracts in English

Journal Articles

Present status of development study on HTGR heat application systems at JAERI

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

Journal Articles

Thermochemical cycle for hydrogen production using HTGR

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

Journal Articles

Corrosion tests of iron-silicon alloys in boiling sulfuric acid

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

Journal Articles

Preliminary process analysis for the closed cycle operation of the iodine-sulfur thermochemical hydrogen production process

*; Nakajima, Hayato; Onuki, Kaoru; Ikenoya, Kazuhiko*; Shimizu, Saburo

International Journal of Hydrogen Energy, 24(7), p.603 - 612, 1999/00

no abstracts in English

Journal Articles

Closed-cycle continuous hydrogen production test by thermochemical IS process

Nakajima, Hayato; Ikenoya, Kazuhiko*; Onuki, Kaoru; Shimizu, Saburo

Kagaku Kogaku Rombunshu, 24(2), p.352 - 355, 1998/00

 Times Cited Count:41 Percentile:14.71(Engineering, Chemical)

no abstracts in English

Journal Articles

Corrosion resistance of Fe-Si alloys in boiling sulfuric acid

Ioka, Ikuo; Onuki, Kaoru; Futakawa, Masatoshi; Kuriki, Yoshiro*; *; Nakajima, Hayato; Shimizu, Saburo

Zairyo, 46(9), p.1041 - 1045, 1997/09

no abstracts in English

Journal Articles

Gas permeation through CVD modified anodic alumina membrane

Onuki, Kaoru; *; Nakajima, Hayato; Shimizu, Saburo

J. Chem. Eng. Jpn., 30(2), p.359 - 362, 1997/00

 Times Cited Count:2 Percentile:69.02(Engineering, Chemical)

no abstracts in English

Journal Articles

Concentration of HI$$_{x}$$ solution by electrodialysis

Onuki, Kaoru; Nakajima, Hayato; Shimizu, Saburo

Kagaku Kogaku Rombunshu, 23(2), p.289 - 291, 1997/00

 Times Cited Count:5 Percentile:56.54(Engineering, Chemical)

no abstracts in English

Journal Articles

Corrosion test of compositionally graded Fe-Si alloy in boiling sulfuric acid

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

Journal Articles

Screening tests on materials of construction for thermochemical IS process

Onuki, Kaoru; Ioka, Ikuo; Futakawa, Masatoshi; Nakajima, Hayato; Shimizu, Saburo; *

Zairyo To Kankyo, 46(2), p.113 - 117, 1997/00

no abstracts in English

JAEA Reports

IS Process for thermochemical hydrogen production

Onuki, Kaoru; Nakajima, Hayato; Ioka, Ikuo; Futakawa, Masatoshi; Shimizu, Saburo

JAERI-Review 94-006, 53 Pages, 1994/11

JAERI-Review-94-006.pdf:1.52MB

no abstracts in English

Journal Articles

Reaction methanol with hydriodic acid as a step of CIS process

Onuki, Kaoru; Shimizu, Saburo; Nakajima, Hayato; Ikezoe, Yasumasa; Sato, Shoichi

International Journal of Hydrogen Energy, 15(2), p.93 - 97, 1990/00

no abstracts in English

Journal Articles

Hydrogen reduction of nickel oxide

Nakajima, Hayato; Shimizu, Saburo; Onuki, Kaoru; Ikezoe, Yasumasa; Sato, Shoichi

Nippon Kagakkai-Shi, 1989(4), p.681 - 686, 1989/04

no abstracts in English

66 (Records 1-20 displayed on this page)