气相色谱端值法测定稀溶液的气液平衡

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。

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

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.