物理化学学报 >> 1991, Vol. 7 >> Issue (05): 558-565.doi: 10.3866/PKU.WHXB19910509

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气相色谱端值法测定稀溶液的气液平衡

刘洪勤; 汪文川; 卢焕章   

  1. 北京化工学院化工系，北京 100029
  • 收稿日期:1990-06-30 修回日期:1991-01-21 发布日期:1991-10-15
  • 通讯作者:

Vapor Liquid Equilibrium of Dilute Solutions by the Limiting Values From the Gas Chromatographic Measurements

Liu Hong-Qin; Wang Wen-Chuan; Lu Huan-Zhang   

  1. Department of Chemical Engineering, Beijing Institute of Chemical Technology, Beijing 100029
  • Received:1990-06-30 Revised:1991-01-21 Published:1991-10-15
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摘要： 本文提出了一种由气相色谱测定的γ_1~(∞)和(dln γ_1/dx_1)x_1→∞推算稀溶液气液平衡的方法。经较严格的推导, 得到(dlnγ_1/dx_1)x_1→∞的新测定公式; 与现有公式比较, 本文式更严格、具一般性,也更易于应用。将所得公式用于确定稀溶液活度系数模型参数, 进而推算气液平衡, 与直接测定值相比较, 得到了满意的结果。

关键词: 气液平衡, 稀溶液, 气相色谱, 端值

Abstract: This paper proposes a new equation for the determination of the limiting slope of activity coefficient vs mole fraction (dlnγ_1/dx_1)_((x_1)→0) from gas chromatography measurements, the equation has been rigorously derived and is convenient to be applied. A method to predict the vapor liquid equilibrium of dilute solutions from the infinite dilute activity coefficient γ_1~∞ and (dlnγ_1/dx_1)_((x_1)→0) has also been presented by virtue of the activity coefficient models for dilute solutions proposed recently. The results of predictions for 7 systems are satisfactory in comparison with those from direct measurements by the GC method. Finally, our model for (dlnγ_1/dx_1)_((x_1)→0) is compared with that proposed by Valentin and Guiochon, and the results show that our model is a good improvement.

Key words: Vapor liquid equilibrim, Dilute solution, Gas ehromatographic measurement, Limiting value