不同吸附剂在沼气脱碳提纯中的分离性能  

Adsorption separation performance of different absorbents for biogas decarbonization upgrading

作　　者：王志祥[1] 易红宏[1] 唐晓龙[1] 赵顺征[1] 左嫣然 高凤雨 张波文 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083

出　　处：《中南大学学报（自然科学版）》2015年第9期3535-3539,共5页Journal of Central South University:Science and Technology

基　　金：教育部新世纪优秀人才支持计划项目(00022402);中央高校基本科研业务费专项资金资助项目(06101046)~~

摘　　要：采用椰壳活性炭、5A和13X分子筛作为吸附剂,动态配气CO2/CH4混合气体作为模拟沼气,研究不用吸附剂及不用原料气配比条件下的CO2/CH4混合气的吸附分离性能,对吸附饱和的13X分子筛分别进行真空(4.5 k Pa)脱附再生和热力(300℃)脱附再生。研究结果表明:在常温常压下,13X分子筛对混合气中CO2的穿透吸附容量为3.21 mmol/g,对CO2/CH4混合气体的分离系数可达10,明显高于5A分子筛和椰壳活性炭的分离系数;减小混合气中CO2的分压,其穿透时间也随着减小,且吸附容量的减小幅度大于分压的减小幅度;真空脱附再生后的13X分子筛吸附分离性能只能恢复到原来的40%左右,而热力脱附再生后分离性能效果较好。Dynamic adsorption experiments were carried out using coconut shell activated carbon, with 5A and 13 X molecular sieves as adsorbents and gas mixtures with different CO2/CH4 volume ratios as methane simulation. Vacuum（4.5 k Pa） desorption and thermal desorption（300 ℃） on fully adsorbed 13 X molecular sieve were carried out. The results show that the breakthrough adsorption amount of CO2 on 13 X molecular sieve is 3.21 mmol/g, and the separation factor of CO2/CH4 gas mixtures is up to 10, significantly higher than those of the 5A molecular sieve and coconut shell activated carbon at room temperature and pressure. The breakthrough time becomes smaller, which accompanies the decrease of CO2 partial pressure, and the decrease rate of adsorption amount is larger than that of partial pressure. The adsorption separation performance of vacuum desorption regeneration of 13 X molecular sieve can only be restored to about 40% of the original one, while thermal desorption regeneration can achieve better results.

关 键 词：活性炭 分子筛 吸附 穿透曲线 再生 

分 类 号：X511[环境科学与工程—环境工程] O643.322[理学—物理化学]