Measurement and Interpretation of the Solubility of a Normal Fluid in a Hydrogen Bonding Solvent: The Methane-Methanol System

摘要

Experimental vapor-liquid equilibrium data have been obtained for the methane-methanol system at 200, 220, 250, 273.15, 290, and 310 K at pressures to 400 atmospheres. The pressures studied at each temperature were in response to a Krichevsky-Kasarnovsky plot of the data. An initial negative slope for each isotherm indicated the need for a Krichevsky-Iliinskaya form of representation taking into account highly nonideal liquid phase behavior. The solubility data are found to follow the Krichevsky-Iliinskaya equation over the entire range of the experiments using an unsymmetric 2-suffix Marguleles activity coefficient expression. The vapor-liquid equilibrium behavior show characteristics typical of systems exhibiting two-liquid phases at some lower temperatures or a frequently encountered supercritically extractive system. A qualitative explanation of the observed behavior is given.