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采用可变体积可视观察法测量装置,测定CO_2与异丁醇在40℃-80℃温度范围和不同压力下的平衡数据。研究高压状态下CO_2在液相中的溶解度和异丁醇在气相中的溶解度模型,以改进亨利定律和Chrastil半经验溶解度方程,提出适合于高压下CO_2与异丁醇二元体系的相互溶解度模型,其中CO_2在液相中的溶解度可用4次多项式模型关联,其形式为:P_(CO_2)=A+B_1·x~(CO_2)+B_2·x_(CO_2)~2+B_3·x_(CO_2)~3+B_4·x_(CO_2)~4。异丁醇在CO_2中的溶解度可用改进的Chrastil半经验溶解度方程模拟,其形式为C=p~k·exp(α/T)+b。结果:所提出的气相溶解度方程和液相溶解度方程与试验数据非常吻合,拟合相关系数和精度较高。
Using a variable volume visual observation measuring device, the equilibrium data of CO 2 and isobutanol at a temperature range of 40 ° C.-80 ° C. under different pressures were determined. The solubility of CO 2 in the liquid phase and the solubility of isobutanol in the gas phase under high pressure were studied. The Henry’s law and the Chrastil semi-empirical solubility equation were improved and the mutual solubility model suitable for the binary system of CO 2 and isobutanol under high pressure was proposed , The solubility of CO 2 in the liquid phase can be related by the fourth degree polynomial model in the form of: P CO 2 = A + B 1 · x ~ (CO 2) + B 2 · x_ (CO 2) ~ 2 + B 3 · x_ (CO 2) ~ 3 + B_4 · x_ (CO_2) ~ 4. The solubility of isobutanol in CO 2 can be modeled using a modified Chrastil semi-empirical solubility equation in the form C = p ~ k · exp (α / T) + b. Results: The proposed gas solubility equation and liquid solubility equation are in good agreement with the experimental data, and the fitting correlation coefficient and accuracy are high.