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Investigation on methane recovery from low-concentration coal mine gas by tetra-n-butyl ammonium chloride semiclathrate hydrate formation

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  • Zhong, Dong-Liang
  • Wang, Wen-Chun
  • Zou, Zhen-Lin
  • Lu, Yi-Yu
  • Yan, Jin
  • Ding, Kun

Abstract

This work presents an investigation of using tetra-n-butyl ammonium chloride (TBAC) semiclathrate hydrate to separate CH4 from a low-concentration coal mine gas containing 30mol% CH4, 60mol% N2, and 10mol% O2. Phase equilibrium data of TBAC semiclathrate hydrate formed in the presence of low-concentration coal mine gas with TBAC concentration ranging from 0.49mol% to 3.3mol% were measured and reported. A high pressure micro-differential scanning calorimeter (HP µ-DSC) was employed to characterize the phase behaviors of TBAC semiclathrate hydrate formed in the presence of coal mine gas with TBAC concentration fixed at 3.3mol% (the stoichiometric concentration of TBAC semiclathrate). It was found that pure TBAC semiclathrate hydrate coexists with the TBAC-coal mine gas mixed hydrate in the pressure range of (1.4–6.2MPa). In addition, kinetic experiments were performed to elucidate the effects of TBAC concentration, subcooling, and sodium dodecyl sulfate (SDS) concentration on CH4 separation efficiency and an optimum experimental condition for semiclathrate-based CH4 recovery was screened. The highest CH4 recovery and separation factor were obtained at the conditions of 0.49mol% TBAC, △T=8K, and 900ppm SDS. It was found that CH4 recovery obtained at 0.49mol% TBAC is comparable with that obtained at 0.29mol% TBAB, whereas CH4 concentration of the gas mixture released from the TBAC hydrate (49.6mol%) is increased substantially comparing to that obtained at 0.29mol% TBAB (42.5mol%).

Suggested Citation

  • Zhong, Dong-Liang & Wang, Wen-Chun & Zou, Zhen-Lin & Lu, Yi-Yu & Yan, Jin & Ding, Kun, 2018. "Investigation on methane recovery from low-concentration coal mine gas by tetra-n-butyl ammonium chloride semiclathrate hydrate formation," Applied Energy, Elsevier, vol. 227(C), pages 686-693.
    • Handle: RePEc:eee:appene:v:227:y:2018:i:c:p:686-693
    DOI: 10.1016/j.apenergy.2017.08.069
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    References listed on IDEAS

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    2. Li, Zheng & Zhong, Dong-Liang & Lu, Yi-Yu & Yan, Jin & Zou, Zhen-Lin, 2017. "Preferential enclathration of CO2 into tetra-n-butyl phosphonium bromide semiclathrate hydrate in moderate operating conditions: Application for CO2 capture from shale gas," Applied Energy, Elsevier, vol. 199(C), pages 370-381.
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    7. Zang, Xiaoya & Wan, Lihua & He, Yong & Liang, Deqing, 2020. "CO2 removal from synthesized ternary gas mixtures used hydrate formation with sodium dodecyl sulfate(SDS) as additive," Energy, Elsevier, vol. 190(C).
    8. Xu, Chun-Gang & Xie, Wen-Jun & Chen, Guo-Shu & Yan, Xiao-Xue & Cai, Jing & Chen, Zhao-Yang & Li, Xiao-Sen, 2020. "Study on the influencing factors of gas consumption in hydrate-based CO2 separation in the presence of CP by Raman analysis," Energy, Elsevier, vol. 198(C).
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