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 30 mol% CH₄, 60 mol% N₂, and 10 mol% O₂. Phase equilibrium data of TBAC semiclathrate hydrate formed in the presence of low-concentration coal mine gas with TBAC concentration ranging from 0.49 mol% to 3.3 mol% 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 3.3 mol% (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 (1.4–6.2 MPa). 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 0.49 mol% TBAC, △T = 8 K, and 900 ppm SDS. It was found that CH₄ recovery obtained at 0.49 mol% TBAC is comparable with that obtained at 0.29 mol% TBAB, whereas CH₄ concentration of the gas mixture released from the TBAC hydrate (49.6 mol%) is increased substantially comparing to that obtained at 0.29 mol% TBAB (42.5 mol%).

这项工作提出使用四的调查Ñ丁基氯化铵（TBAC）semiclathrate水合物分离CH ₄由含有30摩尔％CH低浓度煤矿瓦斯₄，60摩尔％的N ₂和10％（摩尔）Ò ₂。测量并报道了在低浓度煤矿瓦斯存在下，TBAC浓度在0.49 mol％至3.3 mol％范围内形成的TBAC半包合物水合物的相平衡数据。使用高压微分扫描量热仪（HP µ-DSC）来表征在TBAC浓度固定为3.3 mol％（TBAC半铁酸盐的化学计量浓度）的煤矿瓦斯存在下形成的TBAC半铁酸盐水合物的相行为。结果发现，纯TBAC半包合物水合物与TBAC煤矿瓦斯混合水合物在1.4-6.2 MPa的压力范围内共存。此外，进行了动力学实验以阐明TBAC浓度，过冷和十二烷基硫酸钠（SDS）浓度对CH _{4的影响。}筛选了基于半酸盐的CH _4的分离效率和最佳实验条件。在0.49 mol％TBAC，△ T  = 8 K和900 ppm SDS的条件下获得最高的CH ₄回收率和分离因子。发现在0.49 mol％TBAC处获得的CH ₄回收率与在0.29 mol％TBAB处获得的CH ₄回收率相当，而从TBAC水合物释放出的气体混合物的CH ₄浓度（49.6 mol％）与在30℃下获得的相比显着增加。 0.29 mol％TBAB（42.5 mol％）。