化工学报 ›› 2014, Vol. 65 ›› Issue (9): 3490-3498.DOI: 10.3969/j.issn.0438-1157.2014.09.025

• 分离工程 • 上一篇    下一篇

基于沸石ZSM-5的CH4/N2/CO2二元体系吸附平衡

沈文龙, 李嘉旭, 杨颖, 李平, 于建国   

  1. 华东理工大学化学工程联合国家重点实验室, 上海 200237
  • 收稿日期:2014-01-08 修回日期:2014-05-05 出版日期:2014-09-05 发布日期:2014-09-05
  • 通讯作者: 李平
  • 基金资助:

    国家国际科技合作项目(S2015GR1004)。

Binary adsorption equilibrium of CH4, N2 and CO2 on zeolite ZSM-5

SHEN Wenlong, LI Jiaxu, YANG Ying, LI Ping, YU Jianguo   

  1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:2014-01-08 Revised:2014-05-05 Online:2014-09-05 Published:2014-09-05

摘要: 采用Rubotherm磁悬浮天平测量CH4、N2和CO2在沸石ZSM-5上的单组分吸附平衡等温线,温度273~353 K,压力0~500 kPa。采用Sips模型、Toth模型和MSL模型对单组分吸附平衡实验数据进行拟合,拟合结果良好,非线性回归得到相应的模型参数。测量双组分CO2/N2、CO2/CH4和CH4/N2在沸石ZSM-5上的竞争吸附平衡等温线,实验温度为293 K,实验压力为0~500 kPa。采用基于Sips模型的理想吸附溶液理论和双组分MSL模型预测双组分气体在沸石ZSM-5上的竞争吸附平衡等温线,并与实验结果进行比较,预测结果良好。比较CO2/N2、CO2/CH4以及CH4/N2体系在沸石ZSM-5上的竞争吸附选择性系数,探究沸石ZSM-5吸附分离烟道气(CO2/N2体系)、垃圾填埋气(CO2/CH4体系)或煤层气(CH4/N2体系)的可行性,为将来进行工艺设计提供基础数据。

关键词: 沸石ZSM-5, 气体竞争吸附, 二氧化碳吸附, 甲烷吸附, 理想吸附溶液理论模型

Abstract: Adsorption equilibrium isotherms of CH4, N2 and CO2 on zeolite ZSM-5 were measured by Rubotherm magnetic suspension balance in the pressure range of 0-500 kPa and the temperature range of 273-353 K. Sips model, Toth model and MSL model were used to fit the experimental data with acceptable accuracy, and the model parameters were obtained by the non-linear regression method. Binary adsorption isotherms of CO2/N2, CO2/CH4 and CH4/N2 were measured by the magnetic suspension balance with different compositions in the pressure range of 0-500 kPa at 293 K. The Sips model-based ideal adsorbed solution theory and two-component MSL model were used to simulate the competitive adsorption equilibrium isotherms of CO2/N2, CO2/CH4 and CH4/N2. Furthermore, the selectivity of CO2/N2, CO2/CH4 and CH4/N2 gas mixtures were calculated, and the feasibility of adsorption separation, using zeolite ZSM-5 as adsorbent to separate CO2 from flue gases (CO2/N2), CH4 from landfill gases (CO2/CH4) and coal mine gases (CH4/N2) was evaluated.

Key words: zeolite ZSM-5, competitive adsorption, carbon dioxide adsorption, methane adsorption, ideal adsorbed solution theory

中图分类号: