Densities and Viscosities of Ionic Liquid with Organic Solvents
Densities and Viscosities of Ionic Liquid with Organic Solvents
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DOI：
10.3390/app10238342
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发表时间：
2020-11
期刊：
影响因子：
--
通讯作者：
Fuxin Yang;Peng Feng
中科院分区：
文献类型：
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作者：
Fuxin Yang;Peng Feng
1-己基-3-甲基咪唑乙酸盐离子液体广泛应用于化工和生物化工过程。在这项工作中，由于IL的高粘度，有前途的化学品（即，N，N-二甲基乙酰胺、N，N-二甲基甲酰胺和二甲基亚砜）被选择作为降低IL粘度的添加剂。用数字振动U型管密度计和Ubbelohde毛细管粘度计分别测定了含溶剂的液体在303.15 ~ 338.15 K、常压（0.0967 MPa）下的密度和粘度的热物理性质。定量研究了溶剂对离子液体热物理性质的影响。此外，基于测量值，计算了混合物的过量摩尔体积、热膨胀系数和能垒的导出性质，结果表明混合物组成对过量体积变化和粘度有很大影响。硬球模型被用来再现粘度。通过红外光谱研究了IL的化学结构，进一步了解了IL与溶剂之间的相互作用。
The ionic liquid (IL) of 1-hexyl-3-methylimidazolium acetate is widely used in chemical and bio-chemical processes. In this work, due to the high viscosity of IL, the promising chemicals (i.e., N, N-dimethylacetamide, N, N-dimethylformamide, and dimethyl sulfoxide) were selected as the additives to lower IL viscosity. The thermophysical properties of density and viscosity for IL with solvents were measured using a digital vibrating U-tube densimeter and an Ubbelohde capillary viscometer from 303.15 to 338.15 K at atmospheric pressure (0.0967 MPa), respectively. The influences of the solvents on the thermophysical properties of ionic liquid were quantitatively studied. Furthermore, based on the measurement values, the derived properties of excess molar volumes, thermal expansion coefficient, and the energy barrier were calculated, and the results showed that the mixture composition had great impact on excess volume change and viscosity. The hard-sphere model was employed to reproduce the viscosity. The infrared spectroscopy was performed to study the chemical structure to further understand the interactions between IL and the solvents.