Influence of the molar ratio of the deep eutectic solvent {[choline chloride][ethylene glycol]} on the extraction of ethanol from aqueous solutions at 298.15 K and 101.3 kPa

• Grant number: 23/14313-2
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: January 01, 2024
• End date: December 31, 2024
• Field of knowledge: Engineering - Chemical Engineering - Chemical Technology
• Principal Investigator: Pedro Felipe Arce Castillo
• Grantee: Lívia Maria Pereira Freire
• Host Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil

Abstract

This project aims to study the influence of the molar ratio on the deep eutectic solvent (DES) formed by choline chloride and ethylene glycol. Experimental measurement, quality testing, distribution coefficient and separation factor will be carried out, and thermodynamic modeling of phase behavior of the liquid-liquid equilibrium based on the extraction of ethanol from aqueous solutions using the previously mentioned DES with different molar compositions. Experimental process will be carried out in equipment containing the equilibrium cell (made of borosilicate glass) adapted to maintain a constant temperature. The procedure will be as follows: a) the binodal curve will be obtained at the cloud point and will be used as a calibration curve (refractive index and density versus composition); b) the analyzes (composition of the two liquid phases at equilibrium) will be carried out using the refractive index and density; c) the quality test of experimental data will be carried out using the method proposed by Marcilla and collaborators; d) the distribution coefficients and separation factor will be determined with the compositions in equilibrium; e) thermodynamic modeling will be done using the Gamma-Gamma (g-g) approach, based on the excess Gibbs free energy model: UNIQUAC (UNIversal QUAse Chemical). Results will be presented in phase diagrams for ternary systems at temperatures of 298.15 K and 101.3 kPa, for different DES compositions. Finally, the DES extraction efficiency will be compared with experimental results obtained in previous researches with ionic liquids.