Prediction of phase equilibrium characteristics of CO2-ionic liquid working pairs based on K-K equation

被引：0
作者：
Peng L. [1 ]
Wu W.-D. [1 ]
Wu J. [1 ]
Wang L. [1 ]
机构：
[1] School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai
来源：
Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | 2019年 / 33卷 / 02期
关键词：
Henry's constant; Krichevsky-Kasarnovsky equation; Partial molar volume; Solubility;
D O I：
10.3969/j.issn.1003-9015.2019.02.003
中图分类号：
学科分类号：
摘要：
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. © 2019, Editorial Board of Journal of Chemical Engineering of Chinese Universities". All right reserved."
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页码：274 / 282
页数：8
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