Experimental measurements and predictions of gas hydrate dissociation conditions in the presence of methanol and ethane-1,2-diol aqueous solutions

Abstract : In this work, experimental hydrate dissociation conditions of methane in the presence of 0.06, 0.10, and 0.20 mass fractions of methanol and 0.10 and 0.25 mass fractions of ethane-1,2-diol in aqueous solutions are reported. In addition, phase equilibria of a ternary mixture of methane (0.9319 mole fraction) + ethane (0.0481 mole fraction) + propane (0.02 mole fraction) in the presence of 0.25 mass fraction of ethane-1,2-diol aqueous solution is investigated. A high-pressure equilibrium cell is used for measurement of hydrate dissociation conditions in the temperature range of (265.4 to 282.0) K and pressure range of (1.97 to 6.96) MPa. The experimental gas hydrate dissociation conditions are modeled using the van der Waals and Platteeuw (vdW-P) solid solution theory for dealing with the hydrate phase and the Valderrama-Patel-Teja equation of state (VPT-EoS) along with the nondensity dependent (NDD) mixing rules to account for the fluid phases. The obtained experimental data are finally compared with selected experimental data from the literature as well as the model predictions, and acceptable agreements are observed.