HIGH-PRESSURE PHASE-EQUILIBRIA IN THE BINARY-SYSTEM (METHANE PLUS 5-ALPHA-CHOLESTANE)

In this paper, experimental data on the phase behavior of the binary s ystem (methane + 5-alpha-cholestane) are presented. Experiments were c arried out according to the synthetic method. The temperature range in vestigated was from 320 K to 450 K. The pressures applied did not exce ed 250 MPa. Vapor-liquid equilibria have been measured for 18 differen t mixtures. Additionally, the melting curve of pure 5-alpha-cholestane and the course of the three-phase curve (solid 5-alpha-cholestane + l iquid + vapor) was determined. The second critical end point was locat ed at a temperature T = (342.2 +/- 0.5) K, a pressure p = (193.3 +/- 0 .4) MPa, and a mole fraction of 5-alpha-cholestane in the critical flu id phase x = 0.049 +/- 0.004.