Determinación de los coeficientes de interacción para modelos de equilibrio de energía libre en exceso aplicado al sistema del éster de acetato de isoamilo con alcohol isoamílico

Abstract

The production of bioethanol and biodiesel are presented as alternatives to the use of fossil fuels. Although research has been done and advances have been made in these technologies, new possibilities are also presented, such as the use of some of the residues from bioethanol production, for example, Fusel oil, a by-product of the fermentation process; which could be used for the production of solvents useful in the chemical industry, it is vital for the development of these new processes to establish the thermodynamic variables of the liquid-vapor equilibria of esters with their respective alcohols. To determine the interaction coefficients of thermodynamic models of excess free energy equilibria, applied to the system of isoamyl acetate and isoamyl alcohol, and to model the processes of separation and industrial obtaining of the ester, the liquid vapor equilibria of the system were experimentally determined. at three pressures 500, 1013.25 and 1500 MPa; Using the equipment "FISCHER® LABODEST® VLE 602. For each of the pressures selected, different concentrations were adjusted and samples were taken from both the vapor phase and the liquid phase.The concentration of these samples was carried out by gas chromatography coupled to masses in the SHIMADZU GC-MS QP-2010 plus equipment, the Antoine equations were also generated for both compounds and thus obtain the saturation pressure of these as a function of temperature. The analysis of thermodynamic consistency was carried out by the point-to-point method proposed by Wisniak, the data that passed the test were used to find the parameters of the Margules, Van Laar, Wilson and NTRL models. The simulation of each one of the equilibria was carried out using MATLAB R2018b, which allowed to identify the azeotropic point for each pressure studied.