Experimental study of the vapour–liquid equilibria of HI–I2–H2O ternary mixtures, Part 2: Experimental results at high temperature and pressure

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

“…The error of the K-value spans from À50% to 50%, but in view of the range of the calculated results of VLE in the column performance analyses in this study, the error of the K-value is between À17.1% and 12.8%. In addition, for most of the cases, the error in the K-value is less than (5%; the data points in Figure 7 with an error of approximately (15% are obtained by comparing with Larousse et al's experimental results, 37 which have (15% uncertainty in the HI concentration. Therefore, it indicates the results predicted by the OLI database are generally within the experimental uncertainty of the literature data shown in Table 4.…”

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

“…Murphy and O'Connell at the University of Virginia (UVA) [23] also used the ElecNRTL model to model our system phase behavior, but they were able to include in their parameter regression new VLE data that were previously unavailable to Mathias [11], including high-temperature and high-pressure data at RD column conditions [5]. However, they still had no access to our HI-lean LLE data.…”

“…As shown in Fig. 1, the SeI cycle consists of three sections, the net result of which is the thermochemical splitting of water into oxygen and hydrogen gas [5]. In Section 1, the Bunsen reaction produces hydroiodic acid (HI) and sulfuric acid (H 2 SO 4 ) from a feed of water, iodine (I 2 ), and sulfur dioxide (SO 2 ).…”

“…In Section 1, the Bunsen reaction produces hydroiodic acid (HI) and sulfuric acid (H 2 SO 4 ) from a feed of water, iodine (I 2 ), and sulfur dioxide (SO 2 ). These two acids cannot be separated through thermal means such as distillation [4], but when this reaction is carried out with an excess of water and I 2 , two immiscible liquid phases, each rich in their respective acid, form that can be separated gravimetrically [3,5].…”

“…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. In France at CEA, Larousse and co-workers [5] measured VLE for the above ternary at temperatures to 270 C and pressures to 30 bar. The measured vapor compositions were the first measured at conditions close to those at which the RD column would operate.…”