Prediction of VL and VLL equilibria of mixtures containing petroleum reservoir fluids and methanol with a cubic EoS

Vapor—liquid equilibrium studies for the carbon dioxide—methanol system

Gas solubilities in liquid solvents at high pressures: apparatus and results for binary and ternary systems of N2, CO2 and CH3OH

Solubility of hydrogen in methanol at temperatures from 248.41 to 308.20 K

Mixed mobile phases have often been used improperly in supercritical fluid chromatography (SFC) and supercritical fluid extraction (SFE). Phase separation is unavoidable at certain conditions where conventional SFC and SFE are performed, resulting in inhomogeneous mobile phases. We describe here a relatively rapid and accurate approach to determining transition pressures at different temperatures and modifier concentrations. There is close agreement between the experimental values determined in this work and those published by others for methanol and carbon dioxide. The results have been used to test the predictions of several common methods for estimating the critical pressures of mixtures. The methods failed to predict the critical pressure to within 20 atm between approximately 4–20 mol % of modifier. Chromatographic performance was shown to be severely degraded when the pressure in the column is below the gas-liquid transition pressure. The effect of pressure drop in the column on phase behavior is discussed.

K. Yaginuma

Papers

Vapor-liquid equilibria for multicomponent systems containing methanol-acid gases 1. The solubility of inert gases in methanol