Experimental Study on the Separation of CH4 and N2 via Hydrate Formation in TBAB Solution
Experimental Study on the Separation of CH4 and N2 via Hydrate Formation in TBAB Solution
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DOI：
10.1021/ie101726f
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发表时间：
2011-02
影响因子：
4.2
通讯作者：
Qiang Sun;Xu-qiang Guo;Aixian Liu;Bei Liu;Yusheng Huo;Guangyin Chen
中科院分区：
文献类型：
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作者：
Qiang Sun;Xu-qiang Guo;Aixian Liu;Bei Liu;Yusheng Huo;Guangyin Chen
为了减少煤层气与空气(可视为甲烷和氮气的混合物)的混合排放，从而有利于充分利用自然资源和保护环境，本文对四正丁基溴化铵(TBAB)溶液中水合物生成分离甲烷和氮气进行了系统的研究。首先确定了CH4-−-N_2水合物在四丁基溴化铵溶液中的生成条件，然后分别在四丁基溴化铵和四丁基溴化铵-十二烷基硫酸钠溶液中进行了分离实验。实验结果表明，在水中加入四丁基溴化铵后，甲烷和氮气更容易形成水合物。在四丁基溴化铵溶液中单级平衡分离后，水合物中CH4的含量可由46.25%提高到67.86%。在相同条件下，分离后的甲烷在四丁基溴化铵-−-十二烷基硫酸钠溶液中的组成为68.66%，反应时间大大缩短。此外，甲烷的回收率在47%以上，水合物的储气量也得到了很大的提高。
In order to reduce the emission of coal bed methane mixed with air (can be regarded as a CH4 and N2 mixture), which will be helpful to adequately utilize the natural resources and protect environment, the separation of CH4 and N2 via hydrate formation in tetra-n-butylammonium bromide (TBAB) solution was systematically studied in this work. The CH4−N2 hydrate formation conditions were determined in TBAB solution first, and then the separation experiments were carried out in TBAB and TBAB−sodium dodecyl sulfate (SDS) solution, respectively. The experimental results show that CH4 and N2 form a hydrate much easier after adding TBAB to water. The composition of CH4 in the hydrate after single-stage equilibrium separation in TBAB solution can be increased from 46.25 mol % to 67.86 mol %. At the same conditions, the composition of CH4 after separation in TBAB−SDS solution is 68.66 mol % and the reaction time shortens greatly. Besides, the recovery of CH4 is more than 47%, and the gas storage capacity of hydrate ...