Vapor-liquid equilibrium phase behavior of binary systems of carbon dioxide with dimethyl adipate or monomethyl adipate

The vapor–liquid equilibria (VLE) phase boundary data were measured for the binary systems of carbon dioxide + dimethyl adipate (DMA) and carbon dioxide + monomethyl adipate (MMA) at 313.15 K, 333.15 K, 353.15 K, and 373.15 K and pressures up to 29 MPa. A visual and variable-volume phase equilibrium analyzer (PEA) was employed to observe the phase transition over the whole composition range. The vapor-liquid equilibrium ratios (K-values) and the critical points have been estimated from the VLE phase boundary data. The new VLE data obtained from this work were correlated with the Soave-Redlich-Kwong (SRK) and the Peng-Robinson (PR) equations of state incorporating with the two-parameter van der Waals one-fluid mixing rules (vdW2). The PR equation of state yields better results and the average absolute pressure deviations are lower than 4 %. [Display omitted] •The VLE for CO2 + DMA and CO2 +MMA along three isotherms from 313.15 K to 373.15 K.•The critical point is obtained by modeling vapor-liquid coexistence points.•The VLE data were correlated using selected equations of state.•These new VLE data were valuable for the development of process design.