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Flowsheet study of HI separation process from HI-H$$_{2}$$O-I$$_{2}$$ solution in the thermochemical hydrogen production iodine-sulfur (IS) process

熱化学水素製造法ISプロセスにおけるヨウ化水素分離工程のフローシート解析

笠原 清司; Guo, H.*; 田中 伸幸; 今井 良行; 岩月 仁; 久保 真治; 小貫 薫

Kasahara, Seiji; Guo, H.*; Tanaka, Nobuyuki; Imai, Yoshiyuki; Iwatsuki, Jin; Kubo, Shinji; Onuki, Kaoru

熱化学水素製造法ISプロセスに関して、電解電気透析(EED)と蒸留によってHI-H$$_{2}$$O-I$$_{2}$$溶液からヨウ化水素(HI)を分離する工程のフローシート解析を行った。解析のため、新たに、分離膜Nafionを用いたEED実験をもとに、EED操作の熱物質収支推算のための関係式を作成した。同式によるEED解析とシミュレータESPによる蒸留計算を組合せて、HI分離工程の熱物質収支を推算し、所要熱量に及ぼす操作条件(原料供給量,EEDによる濃縮度,蒸留塔の操作圧力)の影響を調べ、最適条件を明らかにした。その結果、EEDに用いる分離膜の特性(膜抵抗,濃縮限界濃度差)がHI分離所要熱量を支配し、その改良が高効率化に重要であることを示した。

Flowsheet investigation of the subsection of HI separation from HI-H$$_{2}$$O-I$$_{2}$$ solution in the thermochemical hydrogen production iodine-sulfur (IS) process was performed. Concentration of HI by electro-electrodialysis (EED) and distillation of HI were applied. Experimental data of the EED cell applying Nafion membrane was used to establish heat/mass balance equations for the cell. Heat/mass balance of HI distillation column was calculated using ESP, a process simulation software. HI molality at the cathode outlet of the cell, pressure in the HI distillation column, and flow rate ratio of the feed to the subsection to distillate of the column were focused as variable parameters for minimum heat demand. Parameters of the EED membrane, electric resistance and upper limit of HI molality between outlet streams, had a great effect on the heat demand; improvement of the membrane parameters is important to reduce the heat demand.

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