物理化学学报 >> 2004, Vol. 20 >> Issue (07): 684-689.doi: 10.3866/PKU.WHXB20040704

研究论文 上一篇    下一篇

Li交换的几种分子筛的氮氩分离性能

关莉莉;段连运;谢有畅   

  1. 北京大学化学与分子工程学院,分子动态与稳态结构国家重点实验室,物理化学研究所,北京 100871
  • 收稿日期:2003-12-02 修回日期:2004-01-19 发布日期:2004-07-15
  • 通讯作者: 谢有畅 E-mail:yxie@pku.edu.cn

The Adsorptive Separation of N2 and Ar by Some Zeolites Highly Exchanged with Li

Guan Li-Li;Duan Lian-Yun;Xie You-Chang   

  1. State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Physical Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871
  • Received:2003-12-02 Revised:2004-01-19 Published:2004-07-15
  • Contact: Xie You-Chang E-mail:yxie@pku.edu.cn

摘要: 采用水溶液离子交换法制备了高Li+交换度的4A、13X和LSX分子筛,并在25 ℃下测定了它们的静态吸附等温线和动态穿透曲线.研究发现,高Li+离子交换度的4A、13X和LSX分子筛都具有较大的氮吸附容量和较高的氮氩分离选择性,说明高Li+离子交换度的4A、13X和LSX分子筛是较好的氮氩分离吸附剂.从动态穿透曲线结果来看,所研究的三种分子筛都有一个最优的吸附分离压力,在本文研究的压力范围内,这个最优压力在0.6 MPa附近.对比高锂交换度的三种分子筛,以高锂交换度的LSX分子筛的氮氩吸附分离性能最好.

关键词: 氮氩分离, 4A, 13X, LSX, 吸附等温线, 穿透曲线

Abstract: The 4A,13X and LSX zeolites were ion exchanged with Li+ repeatedly in water solution, then the adsorption isotherms and breakthrough curves of these zeolites were measured at 25 ℃.The data demonstrate that 4A,13X and LSX highly ion-exchanged with Li+ have higher adsorption capacity and better adsorption selectivity for N2 over Ar. It is clear that the highly Li+ exchanged zeolites are good adsorbents for separation of N2 and Ar. From breakthrough curves we know that the zeolites near completely exchanged with Li+ have a suitable pressure for the adsorption separation of N2 and Ar. In the pressure range we studied, the best pressure is about 0.6 MPa. Comparing with the data from the breakthrough curves of the three highly Li+ exchanged zeolites we conclude that highly Li+ exchanged LSX has better properties for the separation of N2 and Ar than the other two zeolites.

Key words: Separation of N2 and Ar, 4A, 13X, LSX, Adsorption isotherm, Breakthrough curve