A modified LIQUAC model for prediction of the vapor pressure of single liquid desiccant at high concentration and regeneration temperature

Abstract

A comparative study is conducted to find that there are significant prediction deviations of single liquid desiccants vapor pressure at high concentration and regeneration temperature (high temperature) based on existing typical models. Some factors affecting water activity are not taken into account in these models, and they become more significant at high temperature and high concentration. This paper proposes a modified LIQUAC model to improve the prediction accuracy of single liquid desiccants vapor pressure at high temperature and high concentration. In the modified thermodynamic model, the middle-range interaction is derived by enhancing temperature and concentration dependence. By analyzing the prediction results of three typical liquid desiccants, it is found that the theoretical framework of the novel model is better than that of two typical models (using same data base for parameterization) at high temperature and high concentration. The interaction parameters in the modified model have precise physical meanings and make the model can be extended to other electrolyte solutions.