Hydrogen production with high-temperature gas-cooled reactors, 1; Vapor pressure measurement of HI solution for thermochemical IS process

Okuda, Hiroyuki; Hodotsuka, Masatoshi; Kubo, Shinji  ; Onuki, Kaoru

Vapor pressure of hydroiodic acid is necessary for design of distillation column, which is important for improvement of thermal efficiency of IS process. In general, vapor pressure is significant data for getting gas-liquid equilibrium data or azeotropic data, which are necessary for design and operation of distillation separation process. However, the vapor pressure of hydroiodic acid has not almost been known, because it is difficult to design a measurement apparatus to use the corrosive-resistant material for hydroiodic acid such as tantalum, Teflon, and the resisting pressure glass. So, we sellect synthetic method in the measurement method at high pressure such as circulation method, currency method, and static method. Synthetic method has simple structure andsuitable for the measurement of high corrosive material such as supercritical water at high pressure.