Experimental Study of VLE Properties of n-Tetradecane in the Supercritical Binary Solvent (0.367 Propane/0.633 n-Butane)

A high-temperature and high-pressure optical cell VLE apparatus has been applied to measure phase equilibrium properties of n-tetradecane in the supercritical binary solvent (0.367propane + 0.633 n-butane mass fraction) at temperatures of 413.15 K, 433.15 K, and 453.15 K between of pressures (0.9 and 6.6) MPa. The combined expanded uncertainty of the temperature, pressure, and concentration measurements at 0.95 confidence level with a coverage factor of k = 2 is estimated to be 0.15 K, 0.0022, and 0.035, respectively. The critical parameters (TC, PC, wC\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$w_{C}$$\end{document}) were determined based on the measured isothermal phase equilibrium data of the ternary system n-tetradecane + propane/n-butane. It is shown that the critical temperature and pressure of the n-tetradecane + propane/n-butane system increases with concentration of n-tetradecane increases.