摘要
在气升式搅拌反应器中,利用水对微溶气体CO2(常压和室温条件)的物理吸收过程,考察加入辛醇(有机分散相)对传质过程中体积传质系数和增强因子的影响。研究辛醇加入体积分数(1%—5%)、搅拌速率(200—700 r/min)、气体流速(350—700 L/min)变化对吸收效果的影响,用插值函数微商法确定体积传质系数。结果表明,向水体系中加入少量辛醇可以明显改善吸收效果,体积传质系数随辛醇加入体积分数的增加呈现先增加后减小的趋势,当辛醇加入的体积分数为4%左右时吸收效果最好。增强因子与CO2分配系数、扩散系数有关,与吸收效果呈线性关系,最大增强因子为2.76。
In the kettle-type stirred-tank reactor, the effects of volume mass transfer coefficient KLa and enhancement factor E were studied under the normal pressure and at normal temperature in the presence of the dispersed liquid phase （1-octanol） by using the slightly soluble gas （CO2 ） physical absorption process. KLa was evaluated by the interpolation-function derivative law at different 1-octanol volume fraction （1%-5%）, agitation rates （200- 700 r/m）, aeration rates （350-700 L/min）. The result indicates that the gas absorption effect can be promoted by adding a little 1-octanol to the water system, and KLa trends firstly increasing and then decreasing with the increase of 1-octanol volume fraction. When the volume mass transfer coefficient of 1-octanol added reaches 4%, the absorption effect is optimal. The enhancement factor is dependent on CO2 distribution coefficient and diffusion coefficient, and presents linear relation with the absorption effect. The maximum enhancement factor is 2.76.
出处
《化学工程》
CAS
CSCD
北大核心
2010年第2期8-12,共5页
Chemical Engineering(China)
基金
国家自然科学基金资助项目(20776086)
关键词
吸收
搅拌
传质系数
增强因子
absorption
agitation
mass transfer coefficient
enhancement factor
