降膜微反应器中CO_2化学吸收过程传质行为  

Mass transfer behaviors in process of chemical absorption of CO_2 in falling film microreactors

作　　者：张好翠[1,2] 乐军[1] 陈光文[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]中国科学院研究生院,北京100049

出　　处：《化工学报》2010年第3期635-641,共7页CIESC Journal

基　　金：国家自然科学基金项目(20676129);国家高技术研究发展计划项目(2007AA030206);国家重点基础研究发展计划项目(2009CB219903)~~

摘　　要：Gas phase mass transfer in falling film microreactors (FFMRs) with the absorption of CO2 into aqueous solutions of NaOH was investigated.The overall gas-phase mass transfer coefficient increases with NaOH concentration,but decreases as the concentration of CO2 increases.There exists an entrance effect,hindering the mass transfer,which is caused by the dead volume for gas-phase flow in the gas chamber in FFMRs.The entrance effect has a larger impact in a shorter FFMR owing to the relatively large dead volume with respect to that of gas chamber.A decrease in the depth of gas chamber facilitates the mass transfer process.Therefore,the gas-phase entrance or geometry of the gas chamber should be designed appropriately to reduce the entrance effect and improve the mass transfer.Gas phase mass transfer in falling film microreactors （FFMRs） with the absorption of CO2 into aqueous solutions of NaOH was investigated.The overall gas-phase mass transfer coefficient increases with NaOH concentration,but decreases as the concentration of CO2 increases.There exists an entrance effect,hindering the mass transfer,which is caused by the dead volume for gas-phase flow in the gas chamber in FFMRs.The entrance effect has a larger impact in a shorter FFMR owing to the relatively large dead volume with respect to that of gas chamber.A decrease in the depth of gas chamber facilitates the mass transfer process.Therefore,the gas-phase entrance or geometry of the gas chamber should be designed appropriately to reduce the entrance effect and improve the mass transfer.

关 键 词：降膜吸收 气相传质系数 微反应器 微通道 

分 类 号：TQ021.4[化学工程]