Liquid density is important to engineers throughout chemical process industries. Additionally, there is no publication concerning the properties of binary mixtures. reported the viscosities at 278.15–343.15 K under 0.1 MPa with the relative standard uncertainty of 0.06 using a cone and plate ATS Viscoanalyzer. worked on the densities of at 0.1 MPa in the temperature range of 283.15–338.15 K. More studies focus on the mechanism of making bio-productions using IL with solvents, however, little attention has been given to their thermophysical properties. The acetate-based imidazolium IL of 1-hexyl-3-methylimidazolium acetate ( ) has attracted more attention and is chosen to study. The organic solvents, namely N,N-dimethylacetamide (DMA), N,N-dimethylformamide (DMF), and dimethyl sulfoxide (DMSO), are widely selected as the diluents for the homogeneous derivatization of biomass component in ILs. One of the possible ways to reduce the effects is the use of organic solvents as the additives to lower the viscosity and improve the dissolution of biomass in ILs. It is well known that most of the ILs possess high viscosity and that impedes the biomass dissolution in the ILs, affects the mass transfer rate, and increases the pump costs. During the use of ILs, there are several disadvantages that have to be overcome. The infrared spectroscopy was performed to study the chemical structure to further understand the interactions between IL and the solvents.Īmong the huge number of ILs, imidazolium-based ILs are considered attractive solvents for biofuel and chemical processes. The hard-sphere model was employed to reproduce the viscosity. 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 influences of the solvents on the thermophysical properties of ionic liquid were quantitatively studied. 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. 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 ionic liquid (IL) of 1-hexyl-3-methylimidazolium acetate is widely used in chemical and bio-chemical processes.
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