In this study, phase equilibria of gas hydrates of CO₂ in the presence of tetra n-butyl phosphonium bromide (TBPB) and tetrahydrofuran (THF) have been investigated. The experiments were performed using the isochoric pressure search method at varying compositions of promoters. The phase equilibrium data have been reported at 0.01, 0.05, and 0.1 mass fractions of TBPB in aqueous solutions at the temperature and pressure ranges of 278–295 K and 1.1–4.5 MPa, respectively. The results showed that adding the aqueous mixtures of TBPB and THF to the system changes the hydrate phase equilibrium conditions as expected. In comparison with the system including only TBPB, the promotion effect of the applied mixture is low at all studied concentrations of TBPB in the presence of 0.01 mass fraction of THF. However, at 0.05 mass fraction of THF, the hydrate equilibrium pressures at constant temperatures decrease dramatically.

中文翻译：

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CO2 + TBPB + THF + 水系统的气体水合物相平衡数据

_{在本研究中，CO 2}气体水合物在四氢呋喃存在下的相平衡对丁基溴化鏻 (TBPB) 和四氢呋喃 (THF) 进行了研究。使用等容压力搜索方法在不同的促进剂组成下进行实验。在温度和压力范围分别为 278-295 K 和 1.1-4.5 MPa 的水溶液中，相平衡数据分别为 0.01、0.05 和 0.1 质量分数的 TBPB。结果表明，将 TBPB 和 THF 的水性混合物添加到系统中，如预期的那样改变了水合物相平衡条件。与仅包含 TBPB 的系统相比，在 0.01 质量分数的 THF 存在下，在所有研究的 TBPB 浓度下，应用混合物的促进效果都较低。然而，在 0.05 质量分数的 THF 下，恒温下的水合物平衡压力急剧下降。