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.
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