文献类型：期刊文献

英文题名：Backmixing Reduction of a Bubble Column by Interruption of the Global Liquid Circulation

作者：Wu, Yang[1];Cheng, Zhen-Min[1];Huang, Zi-Bin[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, UNILAB Res Ctr Chem React Engn, Shanghai 200237, Peoples R China

年份：2009

卷号：48

期号：14

起止页码：6558

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20093212240187);WOS:【SCI-EXPANDED(收录号:WOS:000268138300010)】；

基金：This work was carried out under support from the State Key Laboratory of Chemical Engineering in China via an open project (No. SKL-ChE-08C03). Fruitful discussions with Professor G. B. Marin and assistant Professor J. Thybaut from the Laboratory of Chemical Technology at Ghent University of Belgium are invaluable in completion of this work. Partial support front the Natural Science Foundation of China (No. 20876043) and the Shanghai Scientific and Technical Committee on Fundamental Research Project (No. 07DJ 14002) are also gratefully acknowledged.

语种：英文

外文关键词：Residence time distribution - Velocity distribution - Liquids

摘要：The strong backmixing of the liquid phase which is prevalent in a bubble column should be ascribed to its Global circulation which is upward in the central region while downward near the wall on the reactor scale. To Suppress the backmixing behavior, interruption of the liquid circulation route should be effective. To verify this presumption, an investigation was conducted with a bubble column 550 cm in height and 50 cm in diameter, which was equipped with four channels of the same size installed at different heights so as to Cut the downward motion of the liquid and therefore prevent the global circulation the liquid. It shows that although the radial velocity distribution of the liquid remains parabolic in the short column constituted by two neighbor channels, the velocity profile tends to be flat in the upward direction as the channel is approached. The residence time distribution analysis shows that the backmixing of liquid could be reduced by 60% when four channels 12 cm in diameter were applied.