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以活性炭AC1为吸附剂,在体积法实验装置上分别测定了其对甲烷、乙烷、丙烷和丁烷4种气体的吸附等温线,吸附温度分别为283、293、303和313 K。利用77 K吸附氮气数据表征AC1,得到其比表面积为956 m~2·g~(-1),孔体积为1.36 m L·g~(-1),孔径分布在1~5 nm,中孔的比例达到了61%。AC1对4种气体的吸附等温线均为I型等温线,分别采用Langmuir方程和Langmuir-Freundlich方程(简称L-F方程)对吸附平衡数据进行拟合,结果表明,L-F方程具有更好的拟合效果,为后序的多组分吸附平衡研究提供了基础数据。AC1对乙烷/丙烷的吸附平衡选择性系数在1.7~2.5,吸附选择性随吸附压力的增大而减小,吸附温度对吸附选择性无明显影响。
The adsorption isotherms of methane, ethane, propane and butane were measured on a volumetric experimental apparatus using activated carbon AC1 as adsorbent. The adsorption temperatures were 283, 293, 303 and 313 K, respectively. AC1 was characterized by 77 K adsorption nitrogen data, and its specific surface area was 956 m 2 · g -1, pore volume was 1.36 m L · g -1, pore size distribution was 1-5 nm, mesopore The proportion reached 61%. The adsorption isotherms of AC1 for all four gases are type I isotherms. The Langmuir-Langmuir-Freundlich equation (LF equation) and Langmuir-Freundlich equation (LF equation) were respectively used to fit the adsorption equilibrium data. The results show that the LF equation has a better fitting effect , Which provided the basic data for the study of multi-component adsorption equilibrium. The equilibrium selectivity of AC1 to ethane / propane was between 1.7 and 2.5. The adsorption selectivity decreased with the increase of adsorption pressure. The adsorption temperature had no obvious effect on the adsorption selectivity.