摘要
在难溶气体吸收体系中加入第3分散相粒子是强化传质过程的一个重要手段,文中采用恒温搅拌釜对ZSM-5型分子筛/水浆料强化CO2的吸收过程进行了实验研究,考察了硅铝摩尔比(120,150,360)、固含率和气相CO2体积分数对增强因子的影响。结果表明:随着分子筛硅铝摩尔比的增加,其疏水性增强,增强因子随之增大;随着分子筛固含率的增加,气液界面处颗粒的覆盖率增大,增强因子迅速增大,当气液界面处颗粒的覆盖率逐渐接近最大覆盖率时,则增强因子逐渐趋于恒定值;随着气相CO2体积分数的增加,溶质在溶液中的扩散作用逐渐增强,而分子筛颗粒输运作用逐渐减弱,增强因子减小。针对分散相微粒增强难溶气体的吸收过程,提出了一个三维非均相传质模型,计算结果和实验数据吻合良好。
Introducing a third dispersed phase particle into the sparingly soluble gas absorption systems is an important intensification method for the enhancement of mass transfer. The enhancement of mass transfer of CO2 absorption into water by ZSM-5 type zeolite was conducted in a thermostatic stirred vessel. The effects of SiO2/ A1203 mole ratios （SiO2/A1203 = 120,150,360, respectively）, solid loading and CO2 volume fraction on the enhancement factor were studied experimentally. The experimental results show that with the increase of zeolite SiO2/A1203 ratio, the zeolite＇s hydrophobicity increases, leading to the increase of enhancement factor. With the increase of the solid loading, the coverage fraction of particle in gas-liquid interface increases, thus the enhancement factor increases; when the coverage fraction of particle in gas-liquid interface is closed to the maximal coverage fraction, the enhancement factor is leveling off to a constant value. With the increase of CO2 volume fraction, the diffusion action of solute increases, and shuttle action of zeolite particle decreases, then the enhancement factor decreases. A 3-D heterogeneous model was proposed to predict the enhancement factor for the sparingly soluble gas absorption process intensified by dispersed particles, and the predicting result agrees well with the experimental data.
出处
《化学工程》
CAS
CSCD
北大核心
2012年第12期10-13,23,共5页
Chemical Engineering(China)
关键词
增强因子
吸收
传质
分子筛
硅铝摩尔比
enhancement factor
absorption
mass transfer
zeolite
Si02/A1203 mole ratio
