Experimental vapour–liquid equilibrium data of HI–H2O–I2 mixtures for hydrogen production by Sulphur–Iodine thermochemical cycle

Simulation Study on the Distillation of Hyper-Pseudoazeotropic HI–I2–H2O Mixture

“…12 The HIÀI 2 ÀH 2 O ternary mixture displays pseudoazeotropic behavior. 13 Unlike normal azeotropes, the compositions of the liquid and vapor phases of the pseudoazeotropic mixture are not identical at the vaporÀliquid equilibrium (VLE). 14 Additionally, the ternary system also exhibits a liquidÀliquid equilibrium at high HI molarity due to the presence of a miscibility gap in the HIÀH 2 O binary mixture.…”

“…A new liquid phase emerges when the HI mole fraction exceeds 0.346 at 25 °C . The HI–I 2 –H 2 O ternary mixture displays pseudoazeotropic behavior …”

Thermochemical water-splitting cycle using iodine and sulfur

“…6 Precise thermodynamic data concerning the concentrated process solutions is desired for accurate evaluation and optimization of the heat/mass balance. 28 Especially, knowledge of the vapor-liquid equilibrium of the HI-I 2 -H 2 O system is insufficient in spite of its importance, and measurements to enhance the database are in progress at Commissariat a l' energie atomique (CEA), 29 Ente per le Nuove tecnologie, l'Energia e l'Ambiente (ENEA) 30 and Japan Atomic Energy Agency (JAEA). 31 Fig.…”

Liquid–liquid equilibrium tie-line compositions at elevated temperatures and pressures for the I2–H2O and HI–I2–H2O systems of the Sulfur–Iodine Cycle

“…Several options have been proposed, including extractive distillation with phosphoric acid [7], electroelectrodialysis [8], membrane distillation [9], and reactive distillation [6]. Reactive distillation (RD) has significant potential, as it would integrate the distillation and HI decomposition into one step [10], but the phase behavior for the HIeI 2 ewater system is highly complex and only partially understood. Quality equilibrium data at conditions relevant to the RD column (i.e., 200e350 C) are required if we are to develop accurate thermodynamic models that can be used to properly assess this key part of the SeI process.…”

“…Liberatore and co-workers [10] at ENEA in Rome used ebulliometry to measure VLE compositions for the ternary HIeI 2 eH 2 O system. A wide range of iodine (0.2e90 wt %) and HI (4e67 wt %) compositions encompassing those expected in the RD column were measured; however, only temperatures below 150 C and ambient pressures were investigated.…”