CIESC Journal

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基于矩法和时间域分析法研究稠密CO2中甲苯和对氯苯在硅胶固定床系统中的吸附和传递性质

杨晓宁   

  1. College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing
    210009, China
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2003-06-28 发布日期:2003-06-28
  • 通讯作者: 杨晓宁

Adsorption and Transfer Properties for Toluene and p-Dichlorobenzene in Dense CO2/Silica
Gel Packed Bed System by Moment Method and Time-Domain Analysis

YANG Xiaoning   

  1. College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing
    210009, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2003-06-28 Published:2003-06-28
  • Contact: YANG Xiaoning

摘要: Based on chromatographic theory, the moment method and the time-domain fitting analysis
wereapplied to measure and evaluate the adsorption equilibrium constant and mass transfer
properties (axial dispersioncoefficient and effective intra- particle diffusivity) for
toluene and p-dichlorobenzene on silica gel adsorbent in thesubcritical and supercritical
CO2. An apparatus based on supercritical fluid chromatography was established and
theexperiments were performed at temperatures of 298.15-318.15 K and pressures of 7.5-17.8
MPa. The two methodshave been compared. The results show that for the systems studied here
the moment method can give reasonablevalues for both adsorption equilibrium constant and
mass transfer properties, but the time-domain analysis only canobtain the adsorption
equilibrium constant. The dependence of adsorption equilibrium constant and mass
transferproperties on temperature and pressure was investigated.

关键词: supercritical CO2;adsorption;chromatography;moment method;time-domain analysis

Abstract: Based on chromatographic theory, the moment method and the time-domain fitting analysis
wereapplied to measure and evaluate the adsorption equilibrium constant and mass transfer
properties (axial dispersioncoefficient and effective intra- particle diffusivity) for
toluene and p-dichlorobenzene on silica gel adsorbent in thesubcritical and supercritical
CO2. An apparatus based on supercritical fluid chromatography was established and
theexperiments were performed at temperatures of 298.15-318.15 K and pressures of 7.5-17.8
MPa. The two methodshave been compared. The results show that for the systems studied here
the moment method can give reasonablevalues for both adsorption equilibrium constant and
mass transfer properties, but the time-domain analysis only canobtain the adsorption
equilibrium constant. The dependence of adsorption equilibrium constant and mass
transferproperties on temperature and pressure was investigated.

Key words: supercritical CO2, adsorption, chromatography, moment method, time-domain analysis