Phase equilibrium model and partial molar volume calculation for dimethylformamide and CO2 binary mixture at high pressure

A constant-volume visual cell was used to measure vapor-liquid phase equilibrium data of dimethylformamide in supercritical carbon dioxide from 323.2K to 353.2K. The phase equilibrium solubility was predicted by Peng-Robinson equation of state together with Vander Waals-2 mixing regulation. Partial molar volumes of vapor phase and liquid phase at equation state were evaluated from proposed model. The correlation between calculated values and the experimental data showed good agreement.