Separation of Methane from Coal Bed Gas via Hydrate Formation in the Presence of Tetrahydrofuran and Sodium Dodecyl Sulfate

Liang

2016

Energy Tech

Self Cite

Coal mine methane (CMM) gas is an unconventional natural gas that can be used as a clean supplementary energy resource when the methane is enriched. In this work, a new technology for separating methane from low‐concentration CMM gas was investigated using gas hydrate formation in the presence of tetrahydrofuran (THF). The concentration of THF was fixed at 19 %, the initial pressure fixed at 0.3 MPa, 0.5 MPa, 0.8 MPa, 1.0 MPa, respectively, and the temperature was maintained at 278.15 K. The results indicated that gas hydrate formation and the separation of CH4 can be easily achieved at 0.3–1.0 MPa in THF solution. It was determined that the hydrate‐based separation process for CH4 recovery from the CMM gas mixture performed better at medium and low initial pressures. The separation factor decreased from 9.5451 to 7.1834 as the reaction pressure rose from 0.3 to 1.0 MPa.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrate‐Based Gas Separation for Methane Recovery from Coal Mine Gas using Tetrahydrofuran

Liang

2016

Energy Tech

Self Cite

“…The high-pressure requirement for hydrate formation is one of the decisive obstacles to commercialize the hydratebased separation process. To solve this inherent problem and to compete with other conventional methods, some hydrate promoters, such as SDS (sodium dodecyl sulfonate), THF (tetrahydrofuran), TBAB (tetra-n-butyl ammonium bromide), and CP (cyclopentane) [11][12][13][14][15][16] which remarkably reduce the required hydrate formation pressure, have been used as additives, without compromising the separation efficiency or gas recovery of the process. According to Zhang et al [17], CP has a potential to be a better thermodynamic promoter than THF for a hydrate-based precombustion CO 2 capture.…”

Section: Introductionmentioning

confidence: 99%

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

Liang

2016

Journal of Chemistry

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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.

“…This structure is stabilized with including gas molecule. Since gas hydrate can take in various gas molecules, several applications have been proposed in environmental and energy fields, for example, natural gas or coal bed gas storage and transportation in the form of gas hydrates [2][3][4], separation processes of gaseous mixtures using differences in hydrate formation tendencies among the gaseous components [5,6], and ocean disposal of anthropogenic CO 2 as a mitigation measure for global warming. Most of these applications dispose a lot of gas hydrate.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Effect on Hydrate Formation in Spray Reactor

Tian

et al. 2015

Journal of Chemistry

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The effects of reaction condition on hydrate formation were conducted in spray reactor. The temperature, pressure, and gas volume of reaction on hydrate formation were measured in pure water and SDS solutions at different temperature and pressure with a high-pressure experimental rig for hydrate formation. The experimental data and result reveal that additives could improve the hydrate formation rate and gas storage capacity. Temperature and pressure can restrict the hydrate formation. Lower temperature and higher pressure can promote hydrate formation, but they can increase production cost. So these factors should be considered synthetically. The investigation will promote the advance of gas storage technology in hydrates.