三种挥发性弱电解质水溶液体系汽液平衡的关联计算

CORRELATION OF VAPOR-LIQUID EQUILIBRIA DATA FOR THREE VOLATILE WEAK ELECTROLYTE SOLUTION

以Edwards提出的通用分子热力学模型为基础关联了氮-硫化氢-水、氨-二氧化碳-水.氨-二氧化碳-硫-化三种挥发性弱电解质水溶液体系的汽液平衡.为了将模型扩展至酸水汽提过程中的高组分浓度区、高温度区(可能导致高压)以及高离子强度区的汽液平衡关联.在模型中加入了三元离子交互作用与温度的关系项.并采用了更新的离子反应平衡常数、享利常数和二元交互作用参数.经计算对比.对原模型不能预测的汽液平衡区域,这种关联能给出较好的结果.

The VLE (vapor-liquid equilibrium) for NH3-H2S-H2O, NH3-CO2-H2O and NH3-CO2-H2S-H2O systems are studied on the basis of Edward's generalized molecular thermodynamic model. The updated values of model-parameters and ternary interaction terms are introduced for the model. The modified model in this paper is extended to calculate the VLE in three regions: high concentration could aqueous solution, high temperature (possibly high pressure), and high ionic strength, which could not be determined in other models. The calculating results are in good agreement with experiment data updated in the literatures.