四参数缔合模型关联胆固醇在高压CO_2流体中的溶解度

利用动态法测定了胆固醇在高压CO2流体中的溶解度,在压力10~30 MPa和温度313~343K范围内,胆固醇溶解度的数量级(以摩尔分数计)在1.0×10-6~1.0×10-4之间。根据高压反应的质量作用定律和相平衡规则,对经典的Chrastil模型进行修正,建立了四参数缔合模型,该模型提高了胆固醇溶解度的关联精度,为胆固醇在CO2流体中相平衡计算与过程控制了提供了依据。

Correlation of the Cholesterol Solubilities in High-Pressure Carbon Dioxide with Association Model of Four Parameters

The solubilities of cholesterol in high-pressure carbon dioxide were determined by a dynamic method under 10 MPa-30 MPa at 313 K--343 K. It was found that solubilities of cholesterol were from 1.0 × 10^-6 to 1.0× 10^-4 . Based on the principle of solvation reaction and the equilibrium constant affected by pressure and temperature, Chrastil model was modified and an association model of four parameters was established. Then the experimental solubility data were correlated by the association model. The results showed there was a good agreement between experimental data and calculational data of the solubilities of cholesterol in highpressure carbon dioxide.