Abstract
Ionic liquid (IL) usually possesses high viscosity. In this work, the selected organic solvents, namely, dimethyl sulfoxide, N,N-dimethylacetamide, and N,N-dimethylformamide, were used as the diluents to lower IL viscosity. The thermophysical properties of the densities and viscosities for the binary mixtures of IL (i.e., 1-octyl-3-methylimidazolium acetate) with solvents were studied at normal pressure in the temperature ranges of 303.15 K to 348.15 K. The effects of the organic solvents on lowering IL viscosity were quantitatively evaluated. The excess properties of the mixtures were calculated to analyze the interactions between IL and solvents. The hard-sphere model was employed to reproduce the viscosity behavior of the pure substances and binary mixtures.
Highlights
Ionic liquids (ILs) are considered as the novel class of molten salts. ey consist of the organic cations and organic anions or inorganic anions. e different anion and cation can be combined and synthetized as the new ionic liquid to meet the requirements for the application
Dimethyl sulfoxide (DMSO) is considered as the alternative solvent and the IL-DMSO mixture has been conducted in the biofuel production and biomass depolymerization [8]. e aprotic solvents of N,Ndimethylacetamide (DMA) and N,N-dimethylformamide (DMF) are well studied [9]
IL of 1-octyl-3-methylimidazolium acetate was supplied by Shanghai Weiting Reagent Biological Technology Co., Ltd. e organic solvents were obtained from Aladdin Shanghai Biochemical Technology Co., Ltd
Summary
Ionic liquids (ILs) are considered as the novel class of molten salts. ey consist of the organic cations and organic anions or inorganic anions. e different anion and cation can be combined and synthetized as the new ionic liquid to meet the requirements for the application. Because of the tunable characteristics, there are huge ionic liquids to be explored. Due to their promising properties, such as the thermal stability, the good conducting nature, and the negligible vapor pressure, ILs are recognized as the green and environmentally friendly solvents, receiving extensive studies [1,2,3]. E imidazolium-based ILs, such as 1-alkyl-3-methylimidazolium chloride and 1-alkyl-3-methylimidazolium acetate, have been studied in the biofuel process and shown the ability to dissolve the lignocellulosic biomass [4]. Zhang et al reported the effect of the cation and anion structure of ionic liquids on the solubility of cellulose; [C8mim][OAc] exhibited poor dissolving capability due to its high viscosity that impedes the cellulose dissolution in ILs [7]. Publications have been focused on the influences of organic solvents on the properties of the binary mixtures containing IL with solvents [10, 11]. e thermophysical properties, namely, the density and the viscosity, are the fundamental data for the scientific research and the industrial application, especially for industrial process design
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