A High-Pressure Quartz Spring Method for Measuring Solubility and Diffusivity of CO2 in Ionic Liquids
A High-Pressure Quartz Spring Method for Measuring Solubility and Diffusivity of CO2 in Ionic Liquids
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DOI：
10.1021/ie400267h
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发表时间：
2013-02
影响因子：
4.2
通讯作者：
Yanan Gong;Hongtao Wang;Yifan Chen;Xiao-hong Hu;Abdul-Rauf Ibrahim;A. Tanyi;Yanzhen Hong;Yuzhong Su;Jun Li;王宏涛;李军
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文献类型：
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作者：
Yanan Gong;Hongtao Wang;Yifan Chen;Xiao-hong Hu;Abdul-Rauf Ibrahim;A. Tanyi;Yanzhen Hong;Yuzhong Su;Jun Li;王宏涛;李军
首次建立了一种石英弹簧高压重量法测定CO2在离子液体中溶解度和扩散系数的装置。利用伸缩式测微仪记录了CO2随时间变化的量，并利用一维扩散模型进行分析，得到了10 MPa压力下CO2在1-正丁基-3-甲基咪唑六氟磷酸盐（[bmim][PF 6]）和1-丁基-3-甲基咪唑四氟硼酸盐（[bmim] [BF 4]）两种离子液体中的扩散系数。从平衡质量得到了CO2在两种离子液体中的溶解度数据，并与文献报道的溶解度数据进行了比较。采用Peng-Robinson状态方程和货车德尔瓦尔斯单流体混合规则对实验数据进行关联，得到了满意的计算结果。实验测得的CO2在[bmim][PF 6]和[bmim][BF 4]中的扩散系数分别从3.550 × 10-10增加到6.064 × 10-10 m2/s和从7.184 × 10-10增加到9.8 × 10- 10 m2/s。
A high-pressure gravimetric apparatus using a quartz spring for measuring solubility and diffusivity of CO2 in ionic liquids (ILs) was established for the first time. The time-dependent amounts of CO2 were recorded with a telescopic cathetometer and analyzed by using a one-dimensional diffusion model to obtain diffusion coefficients of CO2 in two ILs, namely, 1-n-butyl-3-methyl imidazolium hexafluorophosphate ([bmim][PF6]) and 1-butyl-3-methyl imidazolium tetrafluoroborate ([bmim] [BF4]) at pressures up to 10 MPa. Solubility data of CO2 in the two ILs up to 20 MPa were also obtained from its equilibrium masses and compared with those reported in the literature. The Peng–Robinson equation of state with the van der Waals one-fluid mixing rules was employed to correlate the experimental solubility data, revealing satisfactory calculation results. The measured diffusion coefficients of CO2 in [bmim][PF6] and [bmim][BF4] separately increase from 3.550 × 10–10 to 6.064 × 10–10 m2/s and from 7.184 × 10–10 to 9.8...