水溶液中甲苯分散相增强难溶气体吸收

利用难溶气体的物理吸收过程,在具有恒定气液界面面积的吸收装置中研究了常压和室温条件下分散液相(甲苯)对气液传质的增强作用。通过测定气相(丙烷和氢气)压力随时间的变化,计算出液侧传质系数和传质增强因子。试验发现,当传质组分在分散液相与连续液相内的分配系数较大,或在两相间的相对扩散系数较大,且分散相形成的液滴较小时,加入分散液相可显著增强气液传质;增强因子随分散液相含率的增大而增大,但增大幅度逐渐减小;当气体在纯水中的传质系数增大时,同等条件下分散相对气液传质的增强作用减小。

Sparingly Soluble Gases Physical Absorption Enhanced by Presence of Dispersed Toluene Droplets in Water

In this work,the enhancement of gas-liquid mass transfer was studied under the normal pressure and at normal temperature with the presence of the dispersed liquid phase(toluene) by using the sparingly soluble gases(propane and hydrogen) physical absorption process.The mass transfer coefficient and mass transfer enhancement factor can be calculated by measuring the variation of gas(propane and hydrogen) pressure versus time.The result shows that the enhancement factor increases significantly with the presence of the dispersed phase in the condition of the mass transfer component possessing larger partition coefficient in continuous phase and dispersed phase or possessing larger relative diffusion coefficient with the dispersed phase dispersed with finely droplets.Enhancement factor increases with volumetric fraction of dispersed phase increasing,but the gradient becomes smaller;and the effects of enhancement decreases with a relative high mass transfer coefficient in pure water.