PC–SAFT modeling of the high pressure VLE data for 2,2,4–Trimethylpentane with Ethanol, 1–Propanol, 2–Propanol and 1–Butanol. Experimental equipment and binary systems at 1.5 MPa

Abstract

Vapor–liquid equilibrium was measured at 1.5 MPa for binary mixtures of 2,2,4–Trimethylpentane/Ethanol, 2,2,4–Trimethylpentane/1–Propanol, 2,2,4–Trimethylpentane/2–Propanol and 2,2,4–Trimethylpentane/1–Butanol. The experimental data were obtained using a stainless steel ebulliometer with automatic feed control. The data have been verified thermodynamically in order to verify its reliability by employing the ϕ–ϕ approximation with the Valderrama et al. procedure. The results in the percentage of the data global error have been less than 20%, which satisfies the criteria of the verification procedure. All these systems present an azeotropic point at 1.5 MPa. The azeotropic points in all mixtures were obtained by interpolating the vapor–liquid equilibrium data. The azeotropic data results were: 0.164 and 438.17 K for TMPE, 0.2236 and 462.79 K for TMP1P, 0.084 and 446.39 K for TMP2P and 0.396 and 485.84 K TMP1B at 1.5 MPa, respectively for alkane mole fraction and temperature. The singular points in both mixtures have been verified by considering the trend of the azeotropic data. It was verified that the singular points move towards lower alkane mole fractions with pressure increase. The Peng–Robinson equation of state with the Stryjek–Vera modification and by using both quadratic and Wong–Sandler mixing rules, as well as the Perturbed Chain–Statistical Associating Fluid Theory were applied both, to evaluate the reproducibility of data by these models.