Experimental determination of viscosity for the binary mixtures of the ether-functionalized ionic liquids [C(2)2O1IM][TfO] with monohydric alcohols
Experimental determination of viscosity for the binary mixtures of the ether-functionalized ionic liquids [C(2)2O1IM][TfO] with monohydric alcohols
复制标题
醚官能化离子液体[C(2)2O1IM][TfO]与一元醇二元混合物粘度的实验测定
DOI：
10.1016/j.molliq.2020.113538
复制
发表时间：
2020
影响因子：
6
通讯作者：
Hu Xiaohong
中科院分区：
文献类型：
--
作者：
Wei Jie;Lu Donghui;Jiang Cailian;Fang Dawei;Hu Xiaohong
为了将离子液体应用于各个领域，有必要了解其物理和化学性质。特别是粘度，是多组分溶液的重要参数，在工业过程中的传质、传热和流体流动中起着决定性的作用。本文合成了醚基功能化离子液体[C22 O 1 IM][TfO]，并用1H NMR，13 C NMR，ESI质谱和元素分析对其结构进行了表征。测定了离子液体[C22 O 1 IM][TfO]与乙醇、正丙醇和异丙醇在T =（288.15-318.15）K全浓度范围内的粘度。考察了二元体系的粘度与浓度、温度的关系。用Vogel-Tamman-Fulcher（VTF）方程和Arrhenius方程描述了二元体系的粘度随温度的变化关系，VTF方程对二元体系具有较好的相关性。计算表示混合物粘度的实际值与理想值之间的差的粘度偏差Δη。同时，根据混合物的相对粘度ηr，计算了混合物相对粘度的粘流活化能ΔG_r，Δ G_r为负值，与Δη的结果一致，说明由于溶剂化作用，离子间的相互作用变弱。用Redlich-Kister方程可以很好地拟合混合物的粘度偏差Δη和相对粘度的粘流活化能ΔG η r。此外，还计算了相关熵和熵谱，并进行了讨论。
In order to apply ionic liquids in various fields, it is necessary to understand their physical and chemical properties. Viscosity, in particular, is an important parameter of multicomponent solutions and plays a decisive role in mass transfer, heat transfer and fluid flow in industrial process. In this work, the ether-functionalized ionic liquid [C22O1IM][TfO] was synthesized and characterized by1H NMR,13C NMR, ESI mass spectrometry and elemental analysis. The viscosity of the binary mixture of ionic liquid [C22O1IM][TfO] with ethanol, 1-propanol and 2-propanol in the full concentration range ofT= (288.15–318.15) K were measured. The relationships between the viscosity of the binary system and concentration and temperature were investigated. By Vogel–Tamman–Fulcher (VTF) equation and Arrhenius equation, the temperature dependences of the viscosities for the binary system were described and the VTF equation showed better correlation for the binary system. The viscosity deviation that expresses the difference between the actual value and the ideal value of the mixture viscosity, Δη, was calculated. At the same time, the Gibbs energy of activation for viscous flow of the relative viscosity for the mixture, ΔG≠r, was also calculated based on the relative viscosity,ηr, and ΔG≠ris negative that is consistent with the results of, Δη, it means that the interaction between ions becomes weak due to the solvation. The viscosity deviation, Δη, and the Gibbs energy of activation for viscous flow of the relative viscosity for the mixture, ΔG≠r, could be well fitted by the Redlich–Kister equation. In addition, the related entropies and enthalpies were also calculated and discussed.