摘要
水合物法气体分离技术是一种新型的CO_2分离方法,不同的分离条件对CO_2气体分离的效果影响显著。四丁基溴化铵(TBAB)的添加能显著改善CO_2/CH_4混合气水合物的相平衡条件,促进CO_2水合物的生成。作者主要研究在质量浓度为40%的TBAB水溶液体系中,压力为3.2 MPa下,不同过冷度及气水比例的条件对CO_2/CH_4混合气水合物的生成过程及CO_2的分离效果的影响规律。实验结果表明,当压力为3.2 MPa时,气水比越小,CO_2分离效果越好。同时,存在最佳的过冷度使得反应过程中气体消耗量最大以及CO_2分离效果最好,而且CO_2分离效果并非与过冷度完全成正比。当气水比为0.54,过冷度为6 K时,反应结束后气相中CH_4的摩尔比例为81.59%,CO_2的摩尔比例为18.41%,CO_2气体分离系数为4.43,CO_2分离效果最好。
Hydrate based gas separation(HBGS)technology is a relatively new approach for CO2removal.Different operation conditions can significantly influence CO2separation.Addition of tetrabutylammoniumbromide(TBAB)can reduce the hydrate phase equilibrium requirements of CO2/CH4mixture gases andenhance CO2hydrate formation.Gas hydrate formation from a CO2/CH4mixture in distilled water with40%mass fraction of TBAB was examined at3.2MPa and different temperatures.The results indicate that CO2separation factor increases with the decrease of gas/liquid ratio under same pressure and temperature.Meanwhile,CO2separation factor is not fully proportio(mol)at3.2MPa and286K(supercooling degree is6K)with a gas/liquid volume ratio(Vg/Vl)of0.54.CO2gas separation factor is4.43under this condition.
作者
臧小亚
梁德青
吴能友
ZANG Xiao-ya;LIANG De-qing;WU Neng-you(CAS Key Laboratory of Natural Gas Hydrate, CAS Key Laboratory of Renewable Energy,Guangzhou 510640, China;Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences,Guangzhou 510640, China;Guangdong Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China;Qingdao Institute of Marine Geology, China Geological Survey,Qingdao 266000, China)
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2017年第4期802-809,共8页
Journal of Chemical Engineering of Chinese Universities
基金
国家自然科学基金(51676197)
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)
关键词
水合物
CO2分离
TBAB
半笼型
混合气
hydrate
CO2 separation
tetrabutylammonium bromide (TBAB)
semi-clathrate
mixture gas
