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Inagaki, Yoshiyuki; Sakaba, Nariaki; Tanaka, Nobuyuki; Nomura, Mikihiro*; Sawada, Shinichi*; Yamaki, Tetsuya*
Nihon Kaisui Gakkai-Shi, 73(4), p.194 - 202, 2019/08
The thermochemical IS process is a promising hydrogen production method which can produce hydrogen in a large amount and stably with high efficiency by thermal splitting of water. Research and development on chemical reaction technology with membranes was conducted for the purpose of improving the efficiency of IS process and application of solar heat. The basic technology of ceramic membranes applied to decomposition reactions of hydrogen iodine and sulfuric acid was developed, and it is expected that the conversion rate on decomposition in each reaction can be remarkably improved. The basic technology of a cation exchange membrane applied to Bunsen reaction was developed with radiation-induced grafting technique, it is expected that the amount of iodine can be reduced to about one-fifth compared to the conventional method. These achievements are important technologies for practical use of the IS process.
Inagaki, Yoshiyuki; Sakaba, Nariaki
Shokubai, 61(2), p.92 - 96, 2019/04
The outline of the membrane IS process to produce hydrogen by thermochemical water splitting using solar heat at around 650
C is described. The membrane technology has been applied to the three main reaction of the IS process to lower the reaction temperature and reduce the amount of circulation materials in the process. The key component technologies such as catalysts, membranes and corrosion resistant materials have been developed. The study was supported in part by the Council for Science, Technology and Innovation, Cross-ministerial Strategic Innovation Promotion Program, "Energy Carrier".
Iwai, Yasunori; Yamanishi, Toshihiko; Hayashi, Takumi; Nishi, Masataka
Fusion Science and Technology, 48(1), p.456 - 459, 2005/07
Times Cited Count：3 Percentile：24.17(Nuclear Science & Technology)Addition of gas separation membrane process into usual tritium removal process from atmosphere in a room is attractive for fusion plants where a large amount of atmosphere should be processed. Therefore, the gas separation membrane has been studied. New concept of membrane separation with reflux flow is proposed in the present. Driving force of membrane separation is the difference of partial pressure through membrane. Hence, reflux of a part of gases at permeated side to feed side enhances driving force. Essential points of present discussion are as follows: (1) Reflux has plus effect of driving force enhancement and minus effect of feed flow increase, hence, there is the optimum. (2) Permeated-side pressure effects enhancement of tritium recovery strongly. (3) Effect of reflux becomes striking as the target species have higher permeability coefficient, therefore, it is favorable for tritium recovery because those of hydrogen gas and water vapor are much higher among atmosphere elements. In addition, application of reflux flow will realize scale reduction of expensive membrane module.
Hayashi, Takumi; Miya, Naoyuki; Kikuchi, Mitsuru; ; Ushigusa, Kenkichi; Masaki, Kei; Kaminaga, Atsushi; *; ; Nagashima, Keisuke; et al.
JAERI-Research 97-007, 150 Pages, 1997/03
JAERI-Research-97-007.pdf:4.07MB
no abstracts in English
Okuno, Kenji; Konishi, Satoshi; Yamanishi, Toshihiko; Ohira, Shigeru; Enoeda, Mikio; Nakamura, Hirofumi; Iwai, Yasunori; Hayashi, Takumi; Kawamura, Yoshinori; Kobayashi, Kazuhiro
Fusion Technology 1996, p.1277 - 1280, 1997/00
no abstracts in English
Ishida, Toshikatsu*; Hayashi, Takumi; Yamada, Masayuki; Suzuki, Takumi; Okuno, Kenji
Fusion Technology, 30(3), p.926 - 930, 1996/12
no abstracts in English
Hayashi, Takumi; Yamada, Masayuki; Suzuki, Takumi; Matsuda, Yuji; Okuno, Kenji
Fusion Technology, 28(3), p.1503 - 1508, 1995/10
no abstracts in English
Hirata, Shingo*; Kakuta, Toshiya*; Ito, H.*; Suzuki, T.*; Hayashi, Takumi; Ishida, Toshikatsu*; Matsuda, Yuji; Okuno, Kenji
Fusion Technology, 28(3), p.1521 - 1526, 1995/10
no abstracts in English
Saito, Kyoichi*; M.Kim*; *; Sugo, Takanobu
Kemikaru Enjiniyaringu, 39(1), p.19 - 23, 1994/01
no abstracts in English
Katakai, Akio; Sugo, Takanobu; Makuuchi, Keizo
Nihon Kagakkai-Shi, 1994(1), p.68 - 73, 1994/00
no abstracts in English
Radiation Physics and Chemistry, 29(N0.6), p.469 - 475, 1987/06
no abstracts in English
Hasegawa, Shin; Azami, Shinya*; Sawada, Shinichi; Hino, Satoshi*; Isobe, Shigehito*; Hashimoto, Naoyuki*; Maekawa, Yasunari
no journal, ,
Hydrogen permselective membranes, which have high hydrogen permeability (approximately 10
10
mol/(m
s Pa) with selectivity against water and nitrogen, have been developed by radiation-induced graft polymerization (RIGP) of an acrylic acid (AAc), tetramethoxysirylstyrene (TMSS), and styrene(St) monomers into porous poly(vinylidene fluoride) (PVDF) films. The porosity of the prepared porous grafted PVDF were almost constant against grafting degrees. Thus, by hot press compression, the porosity of the grafted membranes was reduced to a 20-40% level. The hydrogen permeability of the compressed grafted PVDF is 10 10 mol/(m s Pa) with the hydrogen permselectivity of 3.2 and 3.5 against water and nitrogen, respectively. The above results indicate that RIGP of porous films with a hot press process is a very effective method to prepare hydrogen permselective membranes.
