Hydrogen is considered one of the most optimum energy carriers,and the sulfur-iodine(S-I)cycle is widely regarded as a promising thermochemical approach for producing hydrogen.HI-H2O-12(HIx)solution is the major fluid medium in the Bunsen reaction,which is the core and essential part of the S-I cycle.For the design of Bunsen reactor and analysis of the liquid-liquid separation,HIx solution density data in different temperature and composition is significant.This work comprehensively analyzed the published density data of HIx solution.The ELECNRTL and Wilson models were used to develop the theoretical density model by considering the relationship between specific volume and activity coefficient.Additionally,the semi-empirical density model was developed based on the thermal expansion rate.The results showed that the average relative deviation(ARD)of the theoretical density model derived from ELECNRTL model is 6.95％,and this density model did not account for short-range interactions,suggesting that these interactions in the HIx solution are significant and should not be overlooked.The ARD of the theoretical density model derived from the Wilson model is 1.21％,showing high prediction accuracy at low HI and I2 concentrations.The semi-empirical density model,which assumed a quadratic relationship between thermal expansion rate and specific volume,achieved the highest calculation accuracy with an ARD of 0.93％.
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