物理化学学报 >> 1995, Vol. 11 >> Issue (11): 968-972.doi: 10.3866/PKU.WHXB19951103

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在不同覆盖度下二组分气体在硅胶上的吸附规律

戴闽光,缪蕊平   

  1. 福州大学化学系，福州 350002
  • 收稿日期:1994-11-07 修回日期:1995-02-20 发布日期:1995-11-15
  • 通讯作者:

Binary Gas Adsorption on Silica Gel with Different Surface Coverage

Dai Min-Guang,Miao Rui-Ping   

  1. Department of Chemistry,Fuzhou University,Fuzhou 350002
  • Received:1994-11-07 Revised:1995-02-20 Published:1995-11-15
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摘要：

 

通过测定不同复盖度下的丙酮－正己烷、苯－正已烷、甲苯－正己烷和正戊烷－正己烷四个二组分气体在硅胶上的组成吸附等温线，发现它们有着共同的规律，随着复盖度的增加，各体系的组成吸附等温线都逐渐向下靠近它们各自的气液平衡曲线．因此基本上可以把二组分吸附相看成二组分液相、其中除了形成最低共沸点的丙酮－正己烷体系以外，其它三个体系的组成吸附等温线基本上都可以通过理想溶液的相对挥发度方程式模拟得到

关键词: 二组分气体吸附, 硅胶, 丙酮-正已烷, 甲苯-正已烷, 苯-正已烷, 正戊烷-正已烷, 表面覆盖度

Abstract:

The composition adsorption isotherms (ya~xg curve) for acetone-n-hexane, benzene-n-hexane, toluene-n-hexane and n-pentance-n-hexane vapor mixtures on silica gel with different surface coverage (θ) at 25℃ were measured. The experimental results indicated that the ya ~ xg curves approached gradually down to corresponding binary liquid-vapor equllibrium curves with increasing of surface coverage. Therefore, the binary adsorbed phases are similarly with the binary liquid phase. Except for acetone-n-hexane system, which had a minimum boiling point, the composition adsorption isotherms of the other three binary systems could be simulated by equation of relative volatility.

Key words: Binary gas adsorption, Silica gel, Aceton-n-hexane, Toluene-n-hexane, Benzene-n-hexane, n-Pentane-n-hexane, Surface coverage