A method to Goalie Set separate a gaseous mixture of nitrogen and methane by exploiting the difference between hydrate-formation pressures of nitrogen and methane has been developed to enrich the concentration of methane in low-quality coal-bed methane.The equilibrium isotherms of pure N 2 and CH 4 in CMK-3, a mesoporous carbon material, in the presence of water are measured to determine the optimal L-PROLINE separation parameters.Tetrahydrofuran (THF) was added to the water to lower the pressures at which the gas hydrates are formed.
A gaseous mixture containing 50% methane was fed through a bed filled with CMK-3 in which a THF solution of 5 mmol/g was pre-adsorbed.The final methane concentration was higher than 70% at 275.15 K.