Proposal of Isobutyl Alcohol as Entrainer To Separate Mixtures Formed by Ethanol and Water and 1-Propanol and Water

Abstract

Isobutyl alcohol (IBA) has been proposed as a solvent to carry out the dehydration of ethanol and 1-propanol by means of a nonconventional distillation process. In this way, isobaric vapor−liquid equilibrium (VLE) and vapor−liquid−liquid equilibrium (VLLE) data at atmospheric pressure have been obtained for the ternary systems ethanol (1a) + water (2) + IBA (3) and 1-propanol (1b) + water (2) + IBA (3). Then, these data have been correlated to obtain a set of parameters capable of estimating VLE and VLLE. According to the results achieved, distillation sequences to separate water and ethanol or 1-propanol have been proposed. Finally, a study about the minimum amount of entrainer required to break the azeotrope of the mixture ethanol/1-propanol + water is carried out.

Measurement and Correlation of Isobaric VLE Data for 1-Propanol + Water + 1-Butyl/Decyl-3-methylimidazole Bromide/Nitrate ILs at 101.33 kPa

“…Moreover, the short-chain imidazole cationic ILs were employed as entrainers to separate the propanol and water azeotropic separation . Additionally, researchers also used lipids and alcohols as entrainers, such as propyl acetate identified as having entrainer properties in the azeotropic separation of 1-propanol and water, and the potential of isobutanol as an entrainer was explored for the azeotropic equilibrium between 1-propanol and water . The ILs have tens of thousands of species by the combination of cations and anions; therefore, the selective screening of ILs with COSMO-RS was carried out to separate the azeotropic system. − Simultaneously, the geometry configuration and energies for the components and ILs were optimized to validate the reasonability of the selected ILs by the DFT method. − However, the separation effect predicted for ILs becomes exceedingly dilemma due to the diverse types of ILs with various structures and properties. , …”

Liquid-liquid equilibrium measurements and interaction explorations for separation of azeotrope n-butyl acetate and n-butanol using three ionic liquids

“…Because NBAC and NBA can form the azeotropic mixture composed of (NBA/NBAC, 47/53, mass fraction) at 390.35 K and 101.3 kPa, conventional distillation cannot be applied to separate the azeotrope. Usually, in order to separate the azeotrope, some special distillation methods have been adopted, such as azeotropic distillation [6][7][8], extractive distillation [9][10][11][12] and pressure-swing distillation [13,14]. In addition, liquid-liquid extraction [15][16][17][18] was applied because of its less energy consumption.…”