New experimental VLE data for the binary mixture of carbon dioxide + perfluorohexane (CO2 + C6F14) from 273 K to 333 K

Mixtures of carbon dioxide and perfluorocarbons are more frequently used in different fields: in energy conversion systems, in the electronic industry, in chemical plants and for medical applications. Among all perfluorocarbons, perfluorohexane has interesting properties (e.g. high thermal stability and high carbon dioxide solubility) to be used in mixture, as a working fluid in power and refrigeration cycles. The study of these systems relies on the availability of accurate thermodynamic models of the fluid mixture, which usually require to be calibrated on experimental data. Experimental data on the carbon dioxide and perfluorohexane mixture are scarcely available in literature and limited to a very narrow temperature range. This work aims to enrich the available literature data on VLE measurements of carbon dioxide and perfluorohexane mixture. On the basis of the implemented static-analytical method, high-pressure phase equilibrium data have been collected. Isothermal measurements have been performed within the temperature range of 273 K–333 K and at pressures up to 8.5 MPa. Particular attention to calibration procedures of the measuring devices (temperature and pressure probes and gas chromatograph) and to uncertainty calculation has been devoted. Finally, measurements show a good agreement with the data available in literature.