Solubility of CO2 in Methanol, 1-Octyl-3-methylimidazolium Bis（trifluoromethylsulfonyl）imide, and Their Mixtures  

作　　者：雷志刚 张本凤 朱吉钦 宫万福 吕建宁 李延生 

机构地区：[1]State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing100029, China [2]Wison Engineering Ltd., 1399 Zhangheng Road, Shanghai 201203, China

出　　处：《Chinese Journal of Chemical Engineering》2013年第3期310-317,共8页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China （21121064, 21076008）, and the Projects in the National Sci ence ＆ Technology Pillar Program During the Twelfth Five-Year Plan Period （2011BAC06B04）.

摘　　要：Solubility data of carbon dioxide （CO2） （1） in methanol （2）, 1-octyl-3-methylimidazolium bis（trifluoro- methylsulfonyl）imide （[omim]＋[TfzN]-） （3）, and their mixtures （w3 = 0.2, 0.5, and 0.8） at temperatures 313.2 and 333.2 K and pressures up to 7.0 MPa were measured by a high-pressure view-cell technique. The solubility of CO2 in methanol （w3 = 0）, [omim]＋[Tf2N]- （w3 = 1.0） and their mixtures follows the order of （w3 = 0）〈（w3 = 0.2）〈 （w3 = 0.5）〈（w3 = 0.8）〈（w3 = 1.0） at the same temperature and pressure, while the magnitude of Henry＇s constants follows the reverse order at a given temperature, which is consistent with the COSMO-RS （conductor-like screen- ing for real solvents） calculation. The solubility data of CO2 in methanol and [omim]~[Tf2N]- are correlated with the Peng-Robinson equation of state, and the solubility of CO2 in the mixtures of methanol and [omim]＋[TfzN] can be well predicted based on the mole fraction average of methanol and [omim]＋[Tf2N] over the solubility of CO2 in pure methanol and [omim]＋[Tf2N] . The mixtures of methanol and [omim]＋[Tf2N]- may be used as physical solvents for capturing CO2 with high partial pressures since they combine the advantages of organic solvents and ionic liquids.Solubility data of carbon dioxide (CO2) (1) in methanol (2), 1-octyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([omim]+[Tf2N]-) (3), and their mixtures (w3=0.2, 0.5, and 0.8) at temperatures 313.2 and 333.2 K and pressures up to 7.0 MPa were measured by a high-pressure view-cell technique. The solubility of CO2 in methanol (w3=0), ([omim]+[Tf2N]-) (w3=1.0) and their mixtures follows the order of (w3=0)<(w3=0.2)<(w3=0.5)<(w3=0.8)<(w3=1.0) at the same temperature and pressure, while the magnitude of Henry's constants follows the reverse order at a given temperature, which is consistent with the COSMO-RS (conductor-like screening for real solvents) calculation. The solubility data of CO2 in methanol and [omim]+[Tf2N]- are correlated with the Peng-Robinson equation of state, and the solubility of CO2 in the mixtures of methanol and [omim]+[Tf2N]- can be well predicted based on the mole fraction average of methanol and [omim]+[Tf2N]- over the solubility of CO2 in pure methanol and [omim]+[Tf2N]-. The mixtures of methanol and [omim]+[Tf2N]- may be used as physical solvents for capturing CO2 with high partial pressures since they combine the advantages of organic solvents and ionic liquids.

关 键 词：CO2 SOLUBILITY METHANOL ionic liquids Peng-Robinson equation of state 

分 类 号：TQ116.3[化学工程—无机化工] O645.12[理学—物理化学]