Liquid-Liquid Equilibrium Compositions for the Iodine-HI-Water System of the Sulfur-Iodine Cycle At Elevated Temperatures and Pressures

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Liquid-liquid equilibrium (LLE) phase behavior was investigated for the ternary system iodine-hydroiodic acid-water (I2-HI-H2O) at the elevated temperatures and pressures of interest for the reactive distillation column of the Sulfur-Iodine Cycle. A continuous-flow apparatus, with wetted parts fabricated from tantalum-tungsten alloys, was designed and constructed for the highly corrosive conditions of this work. A central feature of the apparatus is the equilibrium view cell, which allows for the observation and discernment of vapor-liquid, liquid-liquid, and liquid-liquid-vapor equilibria for HIx systems.

LLE compositions for all components present were measured for both the lighter, water-rich phase as well as for the heavier, iodine-rich phase at temperatures to 250 °C at pressures approximately 10 bar above the region of VLLE. HI feed compositions from 2-25 wt % were investigated, with the latter compositions nearing the system's plait point.

Implications of the results for the desired separation of the components of interest will also be discussed.

Adam S. Klett



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