Vapor–liquid equilibria and critical points for the carbon dioxide +1-pentanol and carbon dioxide +2-pentanol systems at temperatures from 332 to 432 K

Abstract

Vapor–liquid equilibria and critical points of the systems: carbon dioxide+1-pentanol at (333.08, 343.69, 374.93, 414.23 and 426.86 K) up to 18.6 MPa and carbon dioxide+2-pentanol at (332.10, 343.61, 374.15, 397.56, 422.28 and 431.78 K) up to 15.7 MPa are reported at compositions near the critical point. An apparatus capable of measurement up to 60 MPa and 523 K based on the static-analytic method has been used to perform fast determinations of the vapor–liquid equilibria and critical pressures. The Soave, Peng–Robinson and Patel–Teja equations of state with Wong–Sandler type mixing rules and temperature independent parameters cannot predict the VLE of the carbon dioxide+1-pentanol and carbon dioxide+2-pentanol systems well (deviations >10% for pressure). Instead the EoS mixture parameters were fitted to the VLE data at each temperature, separately. In this way the calculated VLE are found to be in good agreement with the experimental data.