As unconventional natural gas and hydrate-based gas separation (HBGS) technology has attracted increasing attention, the safe and effective improvement of the reaction rate and separation effect of hydrates has also become the focus of extensive research. Tetrabutylammonium bromide (TBAB) and cyclopentane (CP) are common thermodynamic additives for promoting hydrate formation. To determine the effect of additives on the hydrate phase equilibria of multicomponent gas, the hydrate phase equilibrium conditions of a synthetic ternary gas mixture (CH₄/CO₂/N₂ = 0.5/0.4/0.1) were investigated in a solution prepared using CP and different concentrations of TBAB aqueous solutions (0.05, 0.1, 0.2, and 0.4 mass fractions) with a volume ratio of 0.308 (V/V). The promotion effect of the additives on mixed gas hydrate was weaker than that of pure CP, and the concentration of TBAB had a significant effect on the hydrate phase equilibrium of the system. The effect of TBAB could be neglected at a TBAB mass fraction of 0.05, and that of CP could be neglected at a TBAB mass fraction of 0.4. The results provide theoretical support for the HBGS technology.

中文翻译：

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三元气体混合物与四丁基溴化铵和环戊烷的水合物相平衡

随着非常规天然气与水合物基气体分离（HBGS）技术越来越受到重视，安全有效地提高水合物的反应速率和分离效果也成为广泛研究的焦点。四丁基溴化铵 (TBAB) 和环戊烷 (CP) 是促进水合物形成的常用热力学添加剂。为了确定添加剂对多组分气体水合物相平衡的影响，合成三元气体混合物的水合物相平衡条件（CH ₄ /CO ₂ /N ₂= 0.5/0.4/0.1）在使用 CP 和不同浓度的 TBAB 水溶液（0.05、0.1、0.2 和 0.4 质量分数）制备的溶液中进行了研究，体积比为 0.308 (V/V)。添加剂对混合气体水合物的促进作用弱于纯CP，而TBAB的浓度对体系水合物相平衡有显着影响。TBAB 的影响在 TBAB 质量分数为 0.05 时可以忽略，CP 的影响在 TBAB 质量分数为 0.4 时可以忽略。研究结果为HBGS技术提供了理论支持。