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JAEA Reports

Research and development on chemical reactors made of industrial structural materials and hydriodic acid concentration technique for thermochemical hydrogen production IS process

Kubo, Shinji; Iwatsuki, Jin; Takegami, Hiroaki; Kasahara, Seiji; Tanaka, Nobuyuki; Noguchi, Hiroki; Kamiji, Yu; Onuki, Kaoru

JAEA-Technology 2015-028, 32 Pages, 2015/10

JAEA-Technology-2015-028.pdf:23.69MB

JAEA has been conducting a study on IS process for thermochemical hydrogen production in order to develop massive hydrogen production technology for hydrogen society. Integrity of the chemical reactors and concentration technology of hydrogen iodide in HIx solution were studied. In the former study, the chemical reactors were trial-fabricated using industrial materials. A test of 30 times of thermal cycle test under circulating condition of the Bunsen reaction solution showed integrity of the Bunsen reactor made of fluororesin lined steel. Also, 100 hours of reaction tests showed integrity of the sulfuric acid decomposer made of silicon carbide and of the hydrogen iodide decomposer made of Hastelloy C-276. In the latter study, concerning electro-electrodialysis using cation-exchange membrane, sulfuric acid in the anolyte had little influence on the concentration performance. These results suggest the purification system of HIx solution can be simplified. Based on the Nernst-Planck equation and the Smoluchowski equation, proton transport number, water permeance, and IR drop of the cation exchange membrane were formulated. The derived equations enable quantitative estimation for the performance indexes of Nafion membrane and, also, of ETFE-St membranes made by radiation-induced graft polymerization method.

Journal Articles

R&D of the thermochemical hydrogen production using nuclear heat from High Temperature Gas-cooled Reactor

Kasahara, Seiji; Kubo, Shinji; Ogawa, Masuro

Dennetsu, 44(188), p.25 - 30, 2005/09

JAERI has been carrying out R&D on the HTGR (High Temperature Gas-cooled Reactor) hydrogen production system in the fields of HTGR as heat source, system integration technology and hydrogen prodcution process. History and present state of the R&D of the HTGR hydrogen production system in JAERI is described breifly especially focusing on thermochemical hydrogen production IS process.

Journal Articles

Thermochemical water-splittering hydrogen production using nuclear heat

Onuki, Kaoru

Kagaku Sochi, 45(4), p.114 - 119, 2003/04

no abstracts in English

Oral presentation

Development of cation exchange membranes for the improvement of the thermochemical hydrgogen production method

Kodaira, Takahide*; Ikeda, Ayumi*; Matsuyama, Emi*; Oura, Kotone*; Sawada, Shinichi; Yamaki, Tetsuya; Nomura, Mikihiro*

no journal, , 

There has been a strong motivation to develop new cation exchange membranes suitable for the Bunsen reaction in the thermochemical water splitting IS process. We prepared cation exchange membranes by a radiation grafting polymerization method. The grafting reaction into a poly(ethylene-${it co}$-tetrafluoroethylene) film was performed in a mixture of styrene and divinylbenzene (DVB). The grafted membrane showed two times lower water permeation flux and three times higher activation energy of water diffusion than Nafion212 though both the membranes exhibited a similar water uptake. Therefore, the DVB-based crosslinking in the graft polymer would restrict water permeation through the membrane.

Oral presentation

Development of radiation-grafted cation exchange membranes for hydrogen production; Designing a new grafting container for large-size membranes

Yamaki, Tetsuya; Sawada, Shinichi; Nomura, Mikihiro*

no journal, , 

A thermochemical water-splitting IS process, known to be one of the hydrogen production methods, includes the Bunsen reaction, SO$$_{2}$$ + I$$_{2}$$ + 2H$$_{2}$$O = H$$_{2}$$SO$$_{4}$$ + 2HI. Researchers previously attempted the Bunsen reaction using a Nafion membrane in an electrochemical cell and then found SO$$_{2}$$ permeation through the membrane problematic. Therefore, our research target is to develop Nafion-alternative cation exchange membranes for applications in the electrochemical Bunsen reaction by radiation-graft polymerization. In an effort to do so, we report here the design of a new grafting container, which enables us to prepare large-size membranes for up-scaling the IS process. The stainless-steel reactor had more or less volumetric capacity than the conventional separable glass container. In designing such a vessel, there were two important issues to be considered: (1) how to heat a grafting solution fast and uniformly and (2) how to situate substrate films in the container.

Oral presentation

R&D activities for HTGR thermochemical hydrogen production in JAEA

Kubo, Shinji

no journal, , 

no abstracts in English

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