A study on thermodynamics effect of [EMIM]-Cl and [OH-C2MIM]-Cl on methane hydrate equilibrium line

In this study, the equilibrium conditions of methane hydrate is measured experimentally in the presence
of 1-ethyl-3-methyl-imidazolium chloride ([EMIM]-Cl) and 1-hydroxylethyl-3-methyl-imidazolium
chloride ([OH-C2MIM]-Cl) solutions. These two ionic liquids are chosen to study their performances as
low dosage hydrate inhibitors. To study the effect of these ionic liquids on the equilibrium phase boundary
of methane hydrate, several experiments are conducted in a pressure range of 4–12 MPa. In addition,
the equilibrium data in [EMIM]-Cl solutions are modeled using an equation that takes into account the
effects of electrolyte on the activity of water. Results show that phase boundary of methane hydrate is
shifted toward lower temperature at constant pressure from 0.1 to 1.5 K in the presence of these ionic
liquids. This temperature shift, however, becomes more significant at pressures higher than 70 MPa