中空纤维致密膜基吸收CO_2传质机理分析  

Mass Transfer Mechanism of CO_2 Absorption through a Non-Porous Hollow Fiber Contactor

作　　者：孙承贵[1] 曹义鸣[1] 介兴明[1] 王同华[2] 林斌[1] 袁权[1] 

机构地区：[1]中国科学院大连化学物理研究所,辽宁大连116023 [2]大连理工大学化工学院,辽宁大连116012

出　　处：《高校化学工程学报》2007年第4期556-562,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：国家973计划资助项目(2003CB615703)

摘　　要：研究了硅橡胶/聚砜中空纤维致密膜基吸收CO2的传质机理,考察了吸收剂种类(NaOH、MEA、DEA、TEA)、NaOH浓度、吸收剂流速、吸收剂压力和气相压力对CO2传质系数的影响,并采用数学模型对实验结果进行了分析。其中,用2×103mol·m·3NaOH溶液作吸收剂时,聚合物膜传质为控制步骤,总传质系数与CO2在膜中的传质系数相近,且实验过程中无漏液、鼓泡等现象发生。The mass transfer mechanism of CO2 absorption through a non-porous hollow fiber contactor was studied. In the hollow fiber contactor, silicone rubber-polysulphone hollow fiber composite membranes were used. The effects of various absorbents, liquid volumetric velocity, liquid pressure, concentration of NaOH solution used and gas pressure on the efficiency of CO2 absorption were investigated. A mathematical model of KG was set up, and the results obtained from the model are in good agreement with the experimental results. Both the experimental and calculated data indicate that the chemical absorption has higher absorption efficiency than the physical absorption does, and the mass transfer of the chemical absorption is controlled by the membrane resistance. When NaOH solution with concentration of 2× 10^3 mol·m^-3 was employed as absorbent, the overall mass transfer coefficient almost reaches the value of individual mass transfer coefficient of the membrane. Finally, the smooth absorption process shows that the bubbling and weeping problems, those are frequently encountered in microporous hollow fiber contactor, can be eliminated by using non-porous hollow fiber contactor. Therefore, the non-porous hollow fiber composite membrane used in our study has application potential of using it as a gas-liquid contactor.

关 键 词：膜基吸收 二氧化碳 传质机理 致密膜 

分 类 号：TQ028.8[化学工程]