Abstract
In this work, to separate the azeotrope of isopropanol and water using liquid–liquid extraction, two deep eutectic solvents (DESs) were prepared with methyl trioctyl ammonium chloride and (1-hexanol/1-decanol), which were characterized by 1H NMR and were adopted as extractants. The liquid–liquid equilibrium data for the mixtures (DESs + isopropanol + water) were determined at 298.15 K and 308.15 K. The distribution ratio (D) and separation factor (S) were obtained to judge the extraction performance for the selected DESs. The calculated values of D and S showed that the separation of the mixture isopropanol and water by the DESs is feasible. In addition, the experimental data were successfully fitted by the NRTL model with the RMSD values less than 0.0080. The parameters of the NRTL model were optimized, which is helpful for the separation design and simulation.
Highlights
Isopropanol, as an important cleaning agent, is widely used in the production of electronic devices (Liu et al 2005)
S11–12, the ternary phase diagrams indicate that the heterogeneous region for the system with DES2 is bigger than the DES1 due to its stronger hydrophobicity
Liquid–liquid extraction was adopted to separate the azeotrope of isopropanol and water
Summary
Isopropanol, as an important cleaning agent, is widely used in the production of electronic devices (Liu et al 2005). Isopropanol is produced with water together in the process of corn fermentation and isopropanol can form an azeotrope with water, making it difficult to recover isopropanol from the mixture using general distillation technology. To separate such azeotropes, special distillation technologies such as azeotropic distillation and extractive distillation (Arifin and Chien 2008; Van Hoof et al 2004; Tang et al 2001; Rodriguez and Kroon 2005) are considered in industry. Ionic liquids have been applied in separating the aqueous mixture of isopropanol. Liu et al (2016) selected strongly hydrophobic imidazolium ionic liquids with the [NTf2](bis(trifluoromethylsulfonyl) imide) anion to extract isopropanol from its aqueous solution and explored the effect of the alkyl chain of the cation on extraction ability. Zhang et al (2016) added ionic liquids to the binary azeotrope (isopropanol + water) and found that
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