Vapor–Liquid Equilibrium Study for the Perfluorobutane (R610) + Hydrogen System at 293, 313, and 333 K

Abstract

Vapor–liquid equilibrium (VLE) data for a binary system consisting of perfluorobutane (C4F10) + hydrogen (H2) were measured at three temperatures (293.33, 313.34, and 333.38) K and pressures up to 17.893 MPa, using a static analytical apparatus. Phase sampling was performed via a rapid online sampler injector, and phase composition was via gas chromatography. The expanded uncertainties (k = 2) were within 0.08 K in temperature, within 16 kPa in pressure, and within 0.010–0.012 in mole fraction. The experimental VLE data were modeled via the direct method using the Peng–Robinson (PR) and the Soave–Redlich–Kwong (SRK) equations of state in combination with the Mathias–Copeman (MC) and both the predictive Soave–Redlich–Kwong (PSRK) and the modified Huron–Vidal 2 (MHV2) mixing rules utilizing the nonrandom two-liquid (NRTL) activity coefficient model. PSRK provided superior agreement with the experimental data, yielding an average absolute deviation (AADP) of 12–22% and in vapor-phase composition (AADy) of 0–1%, compared with 28–46% and 0–1% for PR-MHV2, respectively. Comparison with literature VLE data for the CO2 + C4F10 system reveals that C4F10 exhibits strong preferential absorption of perfluorobutane for CO2 over H2 at pressures above 6 MPa.