中文摘要：

沼气是含CO2和CH4的混合气,它的利用需要去除杂质CO2。四丁基溴化铵（TBAB）半笼型水合物法分离CO2是一种新型分离技术。研究了在不同TBAB水溶液浓度体系中,摩尔比为50：50的CH4/CO2混合气水合物在277 K和5 MPa条件下的生成过程及CO2的分离效果。结果表明,当TBAB水溶液质量浓度为0.79%和1.57%时,水合物生成过程存在“二次生成”现象。当TBAB的浓度为0.79%和2.91%时,气体消耗量为0.42 mol,大于其它的TBAB水溶液浓度条件下体系的气体消耗量。综合得出,CO2分离效果并非与TBAB水溶液浓度呈比例,而是存在一个最佳的TBAB浓度最适宜CO2气体的分离。在实验条件下,当TBAB水溶液质量浓度为1.57%时,有效反应时间最短且CO2分离效果最好。

英文摘要：

Semi-clathrate hydrates of tetra-n-butyl ammonium bromide （TBAB） offer potential solution for CO2 separation from biogas. In this work, binary CO2/CH4 gas hydrate formation processes in different concentration TBAB aqueous solutions were examined under 277 K and 5 MPa. The composition change in residual gas phase is continually analyzed during the hydrate formation process, which showed ＂second formation＂ phenomenon when the concentrations of the TBAB aqueous solution are 0.79% and 1.57%. The maximum gas consumption is 0.42 mol with TBAB aqueous solution concentrations of 0.79% and 2.91%. CO2 separation factor is not proportional to TBAB solution concentration, and there is an optimum TBAB concentration for CO2 separation. When the TBAB aqueous solution concentration is 1.57%, the effective reaction time is the shortest with the best CO2 separation performance.