【摘要】 基于Krichevsky–Kasarnovsky（K-K）方程,首先通过将实验测得的溶解度数据与K-K方程相关联,得到不同温度下CO₂的亨利常数和无限稀释偏摩尔体积,然后运用改进的K-K（MKK）方程计算了温度为293.15～333.15 K及压力为0～5.0 MPa内CO₂在离子液体[emim][FAP]、[bmim][FAP]和[hmim][FAP]中的溶解度。结果表明:降低温度和升高压力都有助于提高CO₂的溶解度;同族离子液体阳离子的烷基链长度越长,CO₂的溶解度越大;当压力为5 MPa及温度为293.15 K时,CO₂在离子液体[hmim][FAP]中的溶解度值达到最大值为0.764 1;在相同条件下,CO₂在以上3种离子液体中的亨利常数与CO₂的溶解度大小次序相反,表明亨利常数越小,溶解度越大。由MKK方程计算得到的CO₂在3种离子液体中的溶解度值与实验值之间的总相对偏差绝对平均值分别为1.55%、2.09%和2.73%,表明MKK方程能以较好的精度预测CO₂在所研究离子液体中的溶解度。更多还原

【Abstract】 Henry’s constant and partial molar volume of CO₂ at infinite dilution under different temperatures were obtained by correlating experimental solubility data with Krichevsky-Kasarnovsky（K-K） equation, and the solubility of CO₂ in ionic liquids（ILs） [emim][FAP], [bmim][FAP] and [hmim][FAP] was calculated using a modified K-K（MKK） equation at 293.15～333.15 K and 0～5.0 MPa. The results show that CO₂ solubility in the three ILs decreases with the increase of temperature but increases with the increase of pressure. Longer alkyl chains lead to higher CO₂ solubility. The solubility of CO₂ in [hmim][FAP] reaches the maximum value of 0.764 1 at 5 MPa and 293.15 K. Moreover, the Henry’s constant of CO₂ in the above three ILs shows the opposite trend as that of CO₂ solubility under same conditions, which indicates that smaller Henry’s constants means higher solubility. The absolute average values of total relative deviation between CO₂ solubility values in the three ILs calculated from MKK equation and the experimental values are 1.55%、2.09% and 2.73%, respectively, which indicates that the MKK equation can be used to predict CO₂ solubility in ILs.更多还原