Densities and viscosities of binary mixtures N,N-dimethyl-N-(3-sulfopropyl)cyclohexylammonium tosylate with water and methanol at T = (303.15 to 328.15) K
Densities and viscosities of binary mixtures N,N-dimethyl-N-(3-sulfopropyl)cyclohexylammonium tosylate with water and methanol at T = (303.15 to 328.15) K
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DOI：
10.1016/j.molliq.2016.12.089
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发表时间：
2017-03
影响因子：
6
通讯作者：
Dongren Cai;Yang Jin-bei;Da Hairong;Ling Li;Hongxin Wang;T. Qiu
中科院分区：
文献类型：
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作者：
Dongren Cai;Yang Jin-bei;Da Hairong;Ling Li;Hongxin Wang;T. Qiu
在303.15 ~ 328.15 K、5 K间隔和0.1013 MPa下，测定了N，N-二甲基-N-（3-磺丙基）环己基氨基对甲苯磺酸酯（[CyN 1，1 PrSO 3 H][Tos]）与水和甲醇的密度ρ和粘度η随[CyN 1，1 PrSO 3 H][Tos]质量摩尔浓度（或质量分数）的变化。根据纯IL的密度数据，得到了纯IL的等压热膨胀系数、分子体积、标准摩尔熵和晶格能。由实验数据计算了表观摩尔体积Vφ、无限稀释表观摩尔膨胀率Eφ∞和能垒E。Redlich-Mayer方程用于评估无限稀释表观摩尔体积Vφ∞。此外，粘度可以满意地描述Vogel-Fulcher-Tammann（VFT）方程。离子液体在水溶液中的V φ∞值大于在甲醇溶液中的V φ ∞值，表明[CyN 1，1 PrSO 3 H][Tos] +水二元体系的离子-溶剂相互作用强于[CyN 1，1 PrSO 3 H][Tos] +甲醇二元体系。两种体系的能垒值均随IL质量分数的降低而降低，表明在IL组成较高时，二元混合物的粘度变化对温度更为敏感。
Densities,ρand viscosities,ηofN,N-dimethyl-N-(3-sulfopropyl)cyclohexylammo-nium tosylate ([CyN1,1PrSO3H][Tos]) with water and methanol were measured, at temperatures from 303.15 K to 328.15 K with 5 K interval and 0.1013 MPa, as a function of [CyN1,1PrSO3H][Tos] molality (or mass fraction). The isobaric thermal expansion coefficient, molecular volume, standard molar entropy, and lattice energy of the pure IL were obtained based on the density data of pure IL. The apparent molar volume,Vφ, infinite dilution apparent molar expansibility,Eφ∞and energy barrier,Ewere calculated from the experimental data. The Redlich-Mayer equation was used to evaluate infinite dilution apparent molar volume,Vφ∞. In addition, viscosities can be described satisfactorily by Vogel-Fulcher-Tammann (VFT) equation. TheVφ∞values of the IL in water are higher than those in methanol, which suggests that the ion-solvent interactions for [CyN1,1PrSO3H][Tos] + water binary system are stronger than those for [CyN1,1PrSO3H][Tos] + methanol. And the energy barrier values decrease with the drop of IL mass fraction in both systems, indicating that the viscosity changes of binary mixtures are more sensitive to the temperature at high composition of the IL.