Air‐Water Phase Equilibria of Volatile Organic Solutes
Air‐Water Phase Equilibria of Volatile Organic Solutes
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挥发性有机溶质的气水相平衡
DOI：
10.1002/j.1551-8833.1987.tb02844.x
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发表时间：
1987
影响因子：
--
通讯作者：
P. Roberts
中科院分区：
文献类型：
--
作者：
C. Munz;P. Roberts
平衡或亨利常数Hc和传质速率常数Kla是决定鼓泡曝气和逆流填料塔内传质程度的主要因素。本研究描述了非电离卤化溶质亨利定律的适用范围，并给出了温度和模型助溶剂的加入对亨利常数影响的数据。实验结果与半经验热力学模型以及蒸汽压和溶解度数据的预测值进行了比较。在~10“3的溶质液体摩尔分数范围内，溶质浓度对溶质的亨利常数没有影响。要降低溶质的亨利常数，需要很高的助溶剂浓度，超过-10g/L。所研究的有机化合物的亨利常数每升高10℃，亨利常数增加约1.6倍，表现出很强的影响。因此，温度可能是影响气液接触过程中挥发性有机物脱除程度的关键参数。
The equilibrium or Henry's constant, Hc, and the mass transfer rate constant, KLa , are the major factors determining the extent of transfer during bubble aeration and in countercurrent packed columns. This study delineates the limits of validity of Henry's law for nonionizing halogenated solutes and presents data on the effects of temperature and the addition of model cosolvents on the Henry's constant. The experimental results are compared with predictions from a semi-empirical thermodynamic model and from vapor pressure and solubility data. No effect of solute concentration on the solute's Henry's constant was observed up to solute liquid mole fractions of ~10"3. Very high cosolvent concentrations, in excess of -10 g/L, are required to reduce the solute's Henry's constant. The Henry's constant of the organic compounds studied increases by a factor of approximately 1.6 with each 10°C rise in temperature, representing a very strong effect. Thus, temperature is likely to be a key parameter affecting the extent of removal of volatile organic compounds in gas-liquid contacting processes.