Two equilibrium stills have been designed for measuring vapor−liquid equilibria of hydriodic acid and polyhydriodic acid. The acids are so corrosive that the devices must be made of corrosion resistant materials. For the HI + H2O binary system, a still has been made of tantalum and Hastelloy and operated under pressure. For the HI + H2O + I2 ternary system, another still has been made of glass and operated at atmospheric pressure. With these devices, VLE data of hydriodic acid have been acquired. The experimental conditions for the binary system were as follows: the pressure range was from (0.11 to 0.58) MPa; the HI mole fraction range in the liquid was from 0 to 0.157; and the temperature range was from (375 to 456) K. For the ternary system, the pressure was atmospheric pressure; the HI concentration in the liquid was close to the azeotrope; the HI to I2 mole ratio in the liquid range was from 1/0 to 1/4; and the temperature range was from (396 to 408) K.
Vapor-liquid equilibrium of hydriodic acid (HI-H 2 O) was measured for the thermochemical Iodine-Sulfur process for large-scale hydrogen production from water. The measurement was carried using an equilibrium still made of corrosion resistant metal. Isobaric equilibrium data on the vapor composition and the boiling point was obtained of hydriodic acid in the HI concentration range of 0-0.15 mol/mol and pressure of up to 0.58MPa.
A皿 ong the hydrogen produc 七 ion metho 〔 』 tha も spht water us 血 g hea 諭 om HTGRs , the ochemical water ・ splitting 正 S process has a significant impact in most of the future scenarios , and was selected by JAERI as an 血 portant research priority for future technologies . In the R &D subjects fbr achieving high ther 皿 al efficiency of hydrogen production by IS process, design of 〔 hst 皿 ation column is the most important which separates hydrogen iodide ( HI >from HI ・ 12 ・ H20 miXture . An experimental apparatus was set up to study vapor − hquid equilibnium of the concemed system , which , in spite of its importance , has not been sufficiently known so far . Key "Words : Thermochemical hydrogen production , IS process , Hydriodic acid , Vapor liquid equilib ぬum
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