在搅拌器中油水乳状液的气液传质

Gas-liquid mass transfer in oil-water emulsions in a stirrer

选取CO2为气相,苯/辛烷-水乳状液为液相,通过难溶气体的吸收实验,研究了在带有气体分布器的三相混合吸收装置中分散液相对气液传质的增强作用。实验结果表明,传质增强因子随能量输入的增大而增大,且分散相形成的液滴较小时,在膜内停留时间里小液滴对气液传质有增强作用。分析了"传输机理",总结出增强气液传质的本质在于分散液相通过吸收作用改变气液界面液侧组分浓度梯度,并在此基础上提出了新的描述分散液相增强气液传质的解释。

The relative dispersion of gas-liquid mass transfer was studied in a stirred cell contactor by choosing CO2- benzene or octane/water as gas/liquid absorption system. The experiment shows that the mass transfer enhancement factor increases along with the energy input increasing; small-sized droplets from disperse phase can enhance the gas-liquid mass transfer. The analysis of the ＂shuttle mechanism＂ available in the literatures indicates that the dispersed liquid can increase the components concentration gradient of solute near the gas-liquid interface by absorption, thus the mass transfer is enhanced. A new comment was proposed to describe the enhancement of gasliquid mass transfer by fine droplets.