CH₄Separation from Coal Bed Methane by Hydrate in the SDS and THF Solution

Abstract

Hydrate-based separation experiments on simulate coal bed methane gas have been conducted in THF solution and SDS solution. In this work, a novel hydrate-based gas separation process was used to enhance CH4separation from a 65.7% CH4/20.2% N2/O2gas mixture in the presence of 300 ppm SDS and 19% THF solution. The characteristics of the CH4separation efficiency, fluctuation of temperature, and pressure were studied at different promoter solution. It was found that hydrate formation was induced by promoter in the solution and occurred immediately as the experiments were started. THF performed better than SDS for CH4separation from the CH4/N2/O2gas mixture. In particular, the separation coefficients of CH4and N2were compared in two solutions. The gas mixture S.Fr. or CH4recovery is increased from 1.056 to 1.259 while SF of N2is decreased from 1.183 to 0.634 in THF solution.

Lattice-gas Monte Carlo study of sI clathrate hydrates of ethylene: Stability analysis and cell distortion

“…On another note, attention has been drawn to the use of hydrates as a mean of energy and mass storing [11,12]. Recent attempts have been laid on separation technology based on clathrate hydrates, which mainly consists on the selective partition of the components in both the hydrate phase and the gas phase [13][14][15][16][17]. The growing interest in the Greenhouse Effect has also produced an increase in the interest on the capture of CO 2 for the formation of hydrates [14][15][16][17][18].A further attractive example of technology that is based on hydrate separation is the process of concentration of aqueous solutions [19][20][21][22], such as in desalination and juice concentration.…”