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Thermodynamic consistency and modeling of the liquid-vapor equilibrium of binary systems involving ionic liquids (imidazolium) and Supercritical CO2 by using cubic equations of state

Grant number: 15/21535-5
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): January 01, 2016
Effective date (End): December 31, 2016
Field of knowledge:Engineering - Chemical Engineering - Chemical Technology
Principal researcher:Pedro Felipe Arce Castillo
Grantee:Jefferson Ferreira Guimarães
Home Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil

Abstract

Ionic liquids is a group called of innovative fluid in Engineering and with a tremendous and unsuspected potential in separation processes. These ionic liquids are organic type of molten salts with melting points under 100 ° C and extremely small vapor pressures. In the chemical industry, it is necessary to develop alternative organic solvents due to social pressure and environmental legislation ever tighter. In this sense, the ionic liquids represent an excellent option and have been cataloged as the 'solvents of the future' or 'green solvents'. Moreover and from the thermodynamic point of view, not all the experimental data of vapor-liquid equilibrium of binary systems listed in the literature are correct. The thermodynamic consistency test is the most efficient method to determine the veracity or not of these data. In this research projet, in a first step, it is applied the thermodynamic consistency method for the experimental data of vapor-liquid equilibrium of several binary systems involving ionic liquids (imidazolium) and supercritical carbon dioxide, CO2, by using thermodynamic model (cubic equation of state) such as the Peng-Robinson equation using numerical methods and computational tools. The second step of this research project aims to perform the thermodynamic modeling of the liquid-vapor phase behavior only of binary systems, mentioned above, considered thermodynamically consistent.