Prediction of hydrate dissociation conditions for alkanes in the presence of alcohol and electrolyte solutions using ion-based statistical associating fluid theory

Ion-based statistical associating fluid theory (SAFT2), coupled with van der Waals and Platteeuw theory, is applied to predict methane, ethane, and propane hydrate dissociation conditions in the presence of ethanol, ethylene glycol (MEG), and glycerol, as well as mixed MEG and electrolyte solutions, including NaCl, KCl, and CaCl2. Ion-based SAFT2 is found to give accurate predictions for these complex systems. The effects of temperature and concentration on hydrate dissociation conditions are well captured.

► Alkane hydrate equilibria in the presence of alcohol are well predicted by SAFT2. ► Alkane hydrate equilibria with MEG/salts mixed inhibitors are well predicted by SAFT2. ► SAFT2 ion parameters are non-solvent-specific and transferable to other solvents.