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首页> 外文期刊>Chemistry: A European journal >Study on the phase behaviors, viscosities, and thermodynamic properties of CO2/[C(4)mim][PF6]/methanol system at elevated pressures
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Study on the phase behaviors, viscosities, and thermodynamic properties of CO2/[C(4)mim][PF6]/methanol system at elevated pressures

机译：高压下CO2 / [C（4）mim] [PF6] /甲醇系统的相行为，粘度和热力学性质的研究

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An apparatus to determine the vapor-liquid equilibria of CO2/ionic liquid (IL)/organic solvent multisystems and the viscosity of the liquid phase at elevated pressures has been constructed. The solubility of CO2 in 3-butyl-1-methyl-imidazolium hexafluorophosphate ([C(4)mim][PF6]) and the viscosity of CO2-saturated [C(4)mim][PF6] have been studied at 313.15, 323.15, and 333.15 K and at pressures up to 12.5 MPa. The phase behavior of CO2/[C(4)mim][PF6]/ methanol ternary mixture and the viscosity of the liquid phases at equilibrium condition have also been determined at 313.15 K and at 7.15 and 10.00 MPa. The partition coefficients of the components in the ternary system are calculated. Peng-Robinson equation of state and some thermodynamic functions are combined to calculate the fugacity coefficients of the components in the system. It demonstrates that the viscosity of the IL-rich phase decreases significantly with increasing pressure of CO2, and the effect of temperature on the Viscosity Of COAL mixture is not noticeable at high pressure, although the viscosity of the CO2-free IL decreases dramatically with increasing temperature. Compressed CO2 may become an attractive reagent for reducing the viscosity of ILs in many applications. The mole fraction of methanol in the CO2-rich phase is much lower than that in the IL-rich phase; this indicates that the interaction between the IL and methanol is stronger than that between CO2 and methanol. The fugacity coefficient of CO2 in IL-rich phase is larger than unity, while that of methanol is much small than unity, which further suggests that methanol-IL interaction is much stronger than CO2-IL interaction. However, the CO2-IL interaction is stronger than the CO2-methanol interaction. [References: 48]
机译：已经构造了确定CO 2 /离子液体（IL）/有机溶剂多系统的汽-液平衡和在高压下液相的粘度的装置。在313.15处研究了CO2在3-丁基-1-甲基咪唑六氟磷酸盐（[C（4）mim] [PF6]）中的溶解度和饱和CO2的[C（4）mim] [PF6]的粘度， 323.15和333.15 K，压力高达12.5 MPa。还确定了在平衡条件下在313.15 K和7.15和10.00 MPa下CO2 / [C（4）mim] [PF6] /甲醇三元混合物的相行为和液相的粘度。计算三元系统中各成分的分配系数。结合了Peng-Robinson状态方程和一些热力学函数，可以计算出系统中各组分的逸度系数。结果表明，尽管不含CO2的IL的粘度随着CO2压力的增加而显着降低，但富含IL的相的粘度随CO2压力的增加而显着降低，并且温度对COAL混合物的粘度的影响在高压下并不明显。温度。在许多应用中，压缩的CO2可能会成为降低IL粘度的有吸引力的试剂。富CO2相中甲醇的摩尔分数比富IL相中甲醇的摩尔分数低得多。这表明IL与甲醇之间的相互作用强于CO2与甲醇之间的相互作用。富IL相中CO2的逸度系数大于1，而甲醇的逸度系数小于1，这进一步表明甲醇-IL相互作用比CO2-IL相互作用强得多。但是，CO2-IL相互作用比CO2-甲醇相互作用更强。 [参考：48]

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