Vapor-liquid equilibria for the HI+HO system and the HI+HO+I system

HI+HO系溶液とHI+HO+I系溶液の気液平衡

程塚 正敏; Yang, X.*; 奥田 泰之; 小貫 薫

Hodotsuka, Masatoshi; Yang, X.*; Okuda, Hiroyuki; Onuki, Kaoru

熱化学法ISプロセスの熱物質収支に大きく影響する重要な物性であるヨウ化水素酸の気液平衡データの拡充整備を目的として、これまで実測値のなかった0.110.58MPaの圧力範囲における等圧気液平衡データを測定した。常圧域では、ガラス製オスマー蒸留器を用い、共沸(57wt%)近傍組成のヨウ化水素酸にヨウ素を添加したポリヨウ化水素酸(I/HI=04:モル比)の沸点及び気液平衡組成データを取得するとともに、ヨウ素添加に伴う擬共沸組成のHI/HO比増大傾向を確認した。さらに、タンタル及びハステロイ製Gillespie蒸留器を用いて、常圧以上の高圧域における共沸(57wt%)近傍組成のヨウ化水素酸の沸点及び気液平衡組成データを取得するとともに、従来全圧測定結果から推測されていた圧力増加に伴う共沸組成のHI/HO比低下を定量的に明らかにした。

The isobaric Vapor Liquid Equilibrium(VLE) data in the pressure range of 0.11-0.58MPa where no experimental data had existed was measured for the purpose of increasing VLE data of hydriodic acid which is important physical properties which influence greatly the heat balance and mass balance in the thermochemical IS Cycle. Bubbling point and VLE data of hydriodic acid, which is prepared as adding iodine to almost azeotrope (57%) in the I/HI molar ratio from 0 to 4, were acquired at atmospheric pressure using a glass-made Othemer still. It was confirmed that the ratio of HI/HO of pseudo azeotrope increased as adding iodine. Furthermore, bubbling point and VLE data near the azeotrope in the high pressure range using a tantalum and Hastelloy made Gillespie still. The results quantitatively showed decrese of HI/HO molar ratio of azeotrope as increasing pressure, which used to be estimated by the result of measuring total pressure of hydriodic acid.