Prediction of Non-Ideal Binary Gas Adsorption Equilibria of Volatile Organic Compounds by the Thermodynamic Non-ideal Adsorbed Solution Model

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  • Himeno Shuji
    Department of Civil and Environmental Engineering, Nagaoka University of Technology
  • Okubo Kenichi
    Department of Civil and Environmental Engineering, Nagaoka University of Technology
  • Fujita Shoichi
    Department of Civil and Environmental Engineering, Nagaoka University of Technology

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  • 揮発性有機化合物の非理想系二成分吸着平衡の測定と解析
  • キハツセイ ユウキ カゴウブツ ノ ヒリソウケイ 2セイブン キュウチャク ヘイコウ ノ ソクテイ ト カイセキ

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Abstract

The non-ideal adsorbed solution (NAS) theory was here applied to the correlation of non-ideal binary gas adsorption equilibria of volatile organic compounds (VOCs) on activated carbon BPL.<br>Pure adsorption isotherms for methanol, acetone, benzene, n-hexane, and toluene were measured at three temperatures (293, 323, 353 K) over a range of relative pressures (2×10−7–1×10−2) on activated carbon BPL. Binary gas adsorption equilibria on BPL for toluene/benzene, benzene/acetone, and n-hexane/acetone were measured using both head-space gas chromatography (HSGC) and dynamic methods. Calculations based on the ideal adsorbed solution (IAS) theory correlated well only with the results for the toluene/benzene system, which is considered an ideal mixture. However, the NAS provided much more accurate correlation for non-ideal systems (benzene/acetone and n-hexane/acetone). Furthermore, the NAS was capable of predicting the azeotropic behavior of a highly non-ideal system (toluene/1-propanol on Y-zeolite, from the literature).<br>We concluded that NAS was a useful predictor of non-ideal binary gas adsorption equilibria of VOCs.

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