二元体系加压汽液平衡的研究

STUDY ON THE VAPOR-LIQUID EQUILIBRIA UNDER PRESSURE FOR BINARY SYSTEMS

The saturated vapor pressures of benzene and ethanol in the range of 300-445K were determined seperately in the dual circulating vapor-liquid equilibrium device under pressure. The Antoine constants in the corresponding temperature range were obtained with linear optimization method. The correlated results were in good agreement with the experimental data and those in the literature. The vapor-liquid eqiuiblruim(VLE) data of benzene-athanol and n-heptane-ethanol binary systems under pressure of 101.3, 302.5, 506.8, 709.3, 810.6kPa were determined in the same device. The experimental data of benzene-n-heptane binary system under pressure were correlated. It is suitable to correlate these three binary systems with B-truncated Virial equatio for vapor and Wilson activity coefficient model for liquid phase in the pressure studied range. The VLE data under pressure for benzene-ethanol and n-heptane-ethanol binary systems were also correlated with azeotrope method, and good results were obtained.