Experimental Study, Quality Test and Modeling of the Liquid-Liquid Equilibrium of the n-Butyl Acetate + 1-Butanol + 1-Hexyl-3-Methyl Imidazolium Tetrafluoroborate system

• Grant number: 22/10063-9
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: October 01, 2022
• End date: March 31, 2024
• Field of knowledge: Engineering - Chemical Engineering - Industrial Operations and Equipment for Chemical Engineering
• Principal Investigator: Pedro Felipe Arce Castillo
• Grantee: Pedro Bernardes Noronha
• Host Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil

Abstract

Ionic liquids (LI) have been used to replace organic solvents, mainly due to their lack of vapor pressure, as extraction agents and have often led to improvement of processes. This project aims to perform the experimental analysis, quality testing and thermodynamic modeling of the fluid phase behavior of the liquid-liquid equilibrium based on the extraction of 1-butanol from butyl acetate by using 1-hexyl-3-methyl-imidazolium tetrafluoroborate {[HMIM][BF4]}. Experimental process will be performed in a glass equipment which will consist of the equilibrium cell with an adaptation to keep the temperature constant with the thermostatic bath. Once equilibrium is reached, the analyzes (composition of the two liquid phases) will be made through the refractive indices. Previously, binodal curve will be obtained in the cloud point and will be used as calibration curve (refractive index and density versus composition). To determine the efficiency of the solvent (IL) as an extracting agent in terms of the distribution coefficient and separation factor. Quality test of the experimental data will be performed with the Marcilla and collaborator's method. For the thermodynamic modeling, the Gamma-Gamma (g-g) approach, based on the excess Gibbs free energy model: NRTL (Non-Random Two-Liquids), will be used to obtain the activity coefficients of the components in both liquid phases. Results, experimental and thermodynamic modeling, will be compared in the phase diagram for ternary systems showing the binodal curve and the tie-lines (298,15 K and 101.3 kPa).