Compressed liquid densities and excess volumes of CO₂ + thiophene binary mixtures from 313 to 363 K and pressures up to 25 MPa

Experimental densities for the CO₂ (1) + thiophene (2) binary mixtures are reported from 313 to 363 K and up to 25 MPa. Densities were measured for thiophene and for binary mixtures at five different compositions, x₁ = 0.1990, 0.3818, 0.5661, 0.6996, and 0.9217. Densities of thiophene were correlated by four different models, the Benedict-Webb-Rubin- Starling equation of state (BWRS EoS), the Tait equation (TE), the Toscani and Szwarc (TS) model, and a proposed modification for this last model (MTS). These models represent densities of thiophene with a percent standard deviation of 3.90 × 10^-3, 1.97 × 10^-2, 2.76 × 10 ^-2, and 5.54 × 10^-3, respectively. The excess molar volumes were determined using densities for thiophene calculated from the BWRS EoS and densities for CO₂ calculated from the Span-Wagner EoS. The volumetric behavior and excess molar volumes of CO₂ + thiophene mixtures were modeled using the PC-SAFT EoS.