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3次元表示による2液相を呈するヨウ化水素,硫酸,ヨウ素及び水の4成分系溶液組成分布の解析

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

中島 隼人*; 今井 良行 ; 久保 真治 

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

熱化学水素製造法ISプロセスにおいて、プラント運転時の操作条件決定に重要であるとともにプロセス熱効率に強く相関するヨウ化水素,硫酸,ヨウ素及び水の4成分系による2液相分離特性を、3次元可視化手法により解析した。大気圧環境下で293K及び363Kの温度条件における4成分系溶液の組成を実験的に取得し、それらの分布と形状を正四面体を利用した3次元空間内に可視化することにより、2次元表示では得られなかった2液相分離を生じる組成領域の境界面を明らかにするとともに、各相の酸濃度(ヨウ素を除いた3成分系におけるヨウ化水素モル分率と硫酸モル分率の和)が等しいことを見いだした。これにより、2液相分離を生じる組成領域,酸濃度といった、運転操作や熱効率推算に有用な組成情報を得ることができた。

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.

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