Study on gas-liquid phase equilibrium properties of ionic liquid absorption refrigeration working pairs and their molecular dynamics simulations
To overcome the shortcomings of traditional absorption refrigeration working pairs,ionic liquid refrigeration working pairs have been widely developed and used as ideal substitutes.Herein,the gas-liquid phase equilibrium properties of the[EMIM]BF4/CH3 OH ionic liquid binary system were investigated using static experiments and molecular dynamics simulations.The results reveal that this binary solution shows favorable gas-liquid phase equilibrium properties,and its saturated vapor pressure is experimentally measured to be approximately 21%lower than that of other alcohol-based ionic liquid solutions.In addition,the simulation results exhibit the same order of magnitude and trend as the experimental results,and the relative errors are generally less than 8%.These findings provide physical property database for screening ionic liquid refrigeration working pairs and studying the theoretical cycle system as well as a new method for simulating and predicting the basic properties of ionic liquids.
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