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电解质溶液汽液平衡的预测和计算是是热力学的一个重要研究领域,是加盐萃取精馏模拟计算的重要基础,精 确的推算电解质溶液的汽液平衡数据有着十分重要的理论和实际意义。本文改进了计算电解质溶液汽液平衡的LI- QUAC模型,用计算水-乙醇-乙二醇体系汽液平衡更为精确的NRTL模型代替lIQUAC模型中的UNIFAC模型来计 算溶剂分子间相互作用对超额Gibbs自由能的影响,并据此推算出两种盐-水-乙醇-乙二醇体系的汽液平衡数据, 与本文实验数据及文献数据比较,结果比较满意。该模型对电解质溶液汽液平衡的进一步研究以及加盐萃取精馏的工 程计算均具有一定的指导意义。
The prediction and calculation of the vapor-liquid equilibrium of electrolyte solution is an important field of thermodynamics and an important foundation for the simulation calculation of extractive distillation plus salt extraction. It has very important theoretical and practical significance to accurately calculate the vapor-liquid equilibrium data of electrolyte solution. In this paper, the LI-QUAC model for calculating the vapor-liquid equilibrium of electrolyte solution is improved. The more precise solvent-liquid equilibrium model (NRTL) is used instead of the UNIFAC model in the lIQUAC model to calculate the excess of solvent-molecule interaction Gibbs free energy and calculate the vapor-liquid equilibrium data of two kinds of salt-water-ethanol-ethylene glycol systems. Compared with the experimental data and literature data, the results are satisfactory. This model has some guiding significance for the further study of the vapor-liquid equilibrium of electrolyte solution and engineering calculation of extractive distillation with salt.