变压吸附分离CH_(4)/N_(2)用碳分子筛的制备及其分离性能研究  

Study on preparation of carbon molecular sieves for pressure swing adsorption separation of CH_(4)/N_(2) and their separation performance

作　　者：袁英 陈禹嘉 贺安平 李旭 鲁德华 赵安民 李克兵 黄晨 YUAN Ying;CHEN Yujia;HE Anping;LI Xu;LU Dehua;ZHAO Anmin;LI Kebing;HUANG Chen(State Key Laboratory of Industrial Vent Gas Reuse,National Engineering Research Center for C1 Chemistry,Southwest Institute of Chemical Co.,Ltd.,Chengdu 610225,Sichuan,China)

机构地区：[1]西南化工研究设计院有限公司工业排放气综合利用国家重点实验室,国家碳一化学工程技术研究中心,四川成都610225

出　　处：《低碳化学与化工》2023年第5期155-162,共8页Low-Carbon Chemistry and Chemical Engineering

基　　金：四川省自然科学基金(2023NSFSC0111)。

摘　　要：CH_(4)/N_(2)分离是高效利用天然气、煤层气、油田气、沼气和垃圾填埋气的关键技术。现有研究多集中于分离提纯CH_(4)浓度较低(10%~50%,体积分数,下同)的混合气体。在CH_(4)浓度较高(75%)的CH_(4)/N_(2)混合气体中,以提高碳分子筛对CH_(4)的提浓效果为主要目标,分别对碳分子筛的制备改性和变压吸附测试工艺条件进行了研究。结果显示,以苯为沉积剂,在最优沉积条件(沉积温度为645°C,沉积时间为60 min)下制备的碳分子筛对N_(2)的吸附量为5.980 mL/g,对应的N_(2)/CH_(4)分离系数达到6.970;以上述最优条件制备的碳分子筛为吸附剂,以吸附压力0.3MPa、吸附时间60s,顺放、逆放、抽真空解吸为最佳单塔变压吸附工艺条件,产品气CH_(4)浓度可提升至90%左右,产品气CH_(4)收率达到80%以上。CH_(4)/N_(2) separation is a key technology for the efficient utilization of natural gas,coal-bed gas,oilfield gas,biogas,and landfill gas.Existing research has mostly focused on the separation and purification of low-concentration CH_(4)(from 10%to 50%,volume fraction,the same below)in gas mixtures.In the case of CH_(4)/N_(2) mixtures with high CH_(4) concentration(75%),the main objective is to enhance the CH_(4) purification effect of carbon molecular sieves.The preparation and modification of carbon molecular sieves,as well as the process conditions for pressure swing adsorption testing,were investigated.The results show that carbon molecular sieves prepared with benzene as the deposition agent under optimal deposition conditions(deposition temperature of 645°C,deposition time of 60 min)exhibit the N_(2) adsorption capacity of 5.980 mL/g,and the corresponding N_(2)/CH_(4) separation factor reach 6.970.Using the carbon molecular sieves prepared under the aforementioned optimal conditions as the adsorbent,the best single-tower pressure swing adsorption process conditions for adsorption pressure of 0.3 MPa,adsorption time of 60 s,and operation with normal releasing pressure to the set pressure then inverse releasing and vacuum,result in an increase of the CH_(4) concentration in the product gas to around 90%and a CH_(4) recovery rate of over 80%.

关 键 词：碳分子筛 变压吸附 碳沉积 CH_(4)/N_(2)分离 

分 类 号：TQ028[化学工程]