不同浓度TBAB半笼型水合物法分离沼气中CO_2过程的研究  

CO_2 Removal from Simulated Biogas Using Semi-Clathrate Hydrates of Different Concentration Tetra-n-Butyl Ammonium Bromide Aqueous Solutions

作　　者：臧小亚[1,2,3] 梁德青[1,2,3] 吴能友[4] 

机构地区：[1]中国科学院天然气水合物重点实验室,广东广州510640 [2]广东省新能源和可再生能源研究开发与应用重点实验室,广东广州510640 [3]中国科学院广州能源研究所,广东广州510640 [4]中国地质调查局青岛海洋地质研究所,山东青岛266000

出　　处：《高校化学工程学报》2016年第6期1241-1248,共8页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(51676197;41276043;51206169);国家海洋地质专项项目(GHZ2012006003);中国科学院知识创新工程重要方向项目(KGZD-EW-301);国家高技术研究发展计划项目(2012AA061403-03)

摘　　要：沼气是含CO_2和CH4的混合气,它的利用需要去除杂质CO_2。四丁基溴化铵(TBAB)半笼型水合物法分离CO_2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/CO_2混合气水合物在277 K和5 MPa条件下的生成过程及CO_2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,CO_2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CO_2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CO_2分离效果最好。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.

关 键 词：水合物 CO2分离 四丁基溴化铵(TBAB) 沼气 

分 类 号：TE64[石油与天然气工程—油气加工工程]