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采用固定体积可视观察法测量装置,在50～80℃温度范围内测定了CO2与叔丁醇于不同压力下的平衡数据。通过对高压状态下CO2在液相中的溶解度和叔丁醇在气相中的溶解度模型的研究,对亨利定律和Chrastil半经验溶解度方程进行了改进,提出了分别适合于高压状态下CO2与叔丁醇二元体系的相互溶解度模型。其中CO2在液相中的溶解度可用三次多项式模型关联,其形式为:pCO2=A+B1.xCO2+B2.xC2O2+B3.x3CO2。叔丁醇在CO2中的溶解度可用改进的Chrastil半经验溶解度方程进行模拟,其形式为C=ρk.exp(a/T)+b+c·ρm。结果表明,提出的气相溶解度方程和液相溶解度方程与实验数据有着较高的拟合相关系数和精度。
Using a fixed volume visual observation measuring device, the equilibrium data of CO2 and t-butyl alcohol under different pressures were measured in the temperature range of 50-80 ℃. By studying the solubility of CO2 in liquid phase under high pressure and the solubility of tert-butanol in the gas phase, Henry’s Law and Chrastil semi-empirical solubility equation were improved. Alcohol binary system mutual solubility model. The solubility of CO2 in the liquid phase can be correlated by a cubic polynomial model of the form pCO2 = A + B1.xCO2 + B2.xC2O2 + B3.x3CO2. The solubility of t-butanol in CO2 can be modeled using a modified Chrastil semi-empirical solubility equation of the form C = ρk.exp (a / T) + b + c · ρm. The results show that the proposed gas solubility and liquid solubility equations have good fitting correlation coefficients and experimental data.