气体在电解质水溶液中高压溶解度的研究

采用非原始的平均球近似模型考虑电解质水溶液中离子－离子，离子－偶极和偶极－偶极相互作用，引入色散能作为微扰从而导出流体混合物的Ｈｅｌｍｈｏｌｔｚ自由能表达式，水的分子参数从纯水的饱和蒸汽压数据求得，阴、阳离子参数通过拟合离子的平均活度系数实验数据而得，气体分子参数由气体在纯水中的溶解度数据确定。对于气体－水－电解质复杂体系，未引入二元相互作用参数，应用本文模型仍可较好地预测气体在电解质水溶液中的高

Study on Gas Solubilities in Aqueous Electrolyte Solutions under High Pressures

Gas solubility in aqueous electrolyte solutions has been studied under high pressure. Usingnon-primitive mean sphere approximation(MSA) method and perturbation theory the expression ofHelmholtz free energy for the gas-salt-water system was derived. Then, the chemical potentials ofsystem were deduced. The parameters of water were regressed from saturated vapor pressure data, andthe parameters of ions and gases were determined from solubility of gas and activity coefficient data ofaqueous electrolyte solutions. The proposed model can be used to predict the solubilities of gases inaqueous electrolyte solutions fairly good.