High pressure phase equilibria for binary mixtures of CO2 + 2-pentanol, vinyl butyrate, 2-pentyl butyrate or butyric acid systems

• Published in: The Journal of supercritical fluids Vol. 135; pp. 69 - 77
• Main Authors: Carissimi, Guzmán, Montalbán, Mercedes G., Díaz Baños, F. Guillermo, Víllora, Gloria
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2018
• Subjects: Equation of state; High-pressure phase equilibrium; Mixing rule; Supercritical carbon dioxide; High-pressure phase equilibrium; Supercritical carbon dioxide; Equation of state; Mixing rule
• ISSN: 0896-8446; 1872-8162
• DOI: 10.1016/j.supflu.2018.01.003

[Display omitted] •High pressure phase equilibria of CO2 + organic compound binary systems were measured.•The compounds were 2-pentanol, butyric acid, vinyl butyrate and 2-pentyl butyrate.•Phase equilibrium measurements were carried out at 313.153 K, 323.15 K, and 333.15 K.•The experimental apparatus used was validated with the (CO2 + acetone) binary system.•Experimental data were successfully correlated by thermodynamic models (PR and SRK). High pressure phase equilibrium for four binary systems, (CO2 + 2-pentanol, CO2 + vinyl butyrate, CO2 + 2-pentyl butyrate and CO2 + butyric acid), were measured at three temperatures of (313.15, 323.15 and 333.15) K and pressures up to 11 MPa. These four organic compounds are those involved in the kinetic resolution of rac-2-pentanol and their phase equilibria play a significant role in the separation processes of the reaction compounds. Phase behaviour measurements were taken using a synthetic method in a variable volume high-pressure cell. It was checked that the solubility of CO2 in the four systems decreases with increases in temperature at a constant pressure and all systems present type-I phase behaviour within scope of this work. Modifications of Henry's Law and Peng-Robinson and Soave-Redlich-Kwong equations of state combined with the Quadratic mixing rule were used to correlate experimental equilibrium data to determine the phase behaviour of these systems.