Kinetic promotion of sodium dodecyl sulfate on formation rate of mine gas hydrate

Rapid coal mine gas hydrate formation is the primary key for the application of coal mine gas hydrate technologies such as coal and gas outburst prevention and coal mine gas separation. Gas hydrate formation experiments at initial pressure variations from 7.0 to 9.0 MPa were performed using coal mine gas in the presence of Sodium Dodecyl Sulfate (SDS) in aqueous solution in a high pressure cell. The concentration of SDS in aqueous solution varied from 0.4 to 0.7 mol/L. The kinetic hydrate formation behaviors in the solution were observed. The gas consumption rate and hydrate formation rate were obtained, based on the formation curves of mine gas hydrate, the state equation of real gases and the volume equation of gas hydrate. The hydrate formation rate mainly depends on the initial pressure and SDS concentration. There exists an optimal SDS concentration to maximally promote hydrate growth.