正己烷在两相分配搅拌式反应器中的传质过程研究  

Mass transfer of n-hexane in a two liquid-phase stirred reactor

作　　者：胡静涛 郄凌翔 章晶晓 成卓韦 叶杰旭 张士汉 陈建孟 陈东之 HU Jing-tao;QIE Ling-xiang;ZHANG Jing-xiao;CHENG Zhuo-wei;YE Jie-xu;ZHANG Shi-han;CHEN Jian-meng;CHEN Dong-zhi(College of Environment,Zhejiang University of Technology,Hangzhou 310014,China;Yuhuan Branch of Taizhou Environmental Protection Agency,Taizhou 317600,China)

机构地区：[1]浙江工业大学环境学院,浙江杭州310014 [2]台州市生态环境局玉环分局,浙江台州317600

出　　处：《高校化学工程学报》2020年第3期679-687,共9页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(51778581,21477116);国家重点研发计划(2018YFC0214103-02)。

摘　　要：为研究两相分配搅拌式反应器中硅油对正己烷传质的影响,采用静态顶空法获得正己烷的气/水和硅油混合液分配系数H,通过模型拟合计算最大气相可转移至液相的正己烷体积分数βS^*,利用效能-传热单位数法计算总体积传质系数KLa。结果表明,随着硅油比例φ的提高,H显著下降;"等效吸收容量"模型可以很好地描述H与φ之间的关系;βS^*随着硅油的添加急剧增大,并随着φ提高而上升,而进气流速的增加会导致βS^*减小;KLa会随着φ上升而减小,但硅油显著提升了饱和液相正己烷浓度,从而提高正己烷的总传质速率。In order to study the effect of silicone oil on n-hexane mass transfer in a two liquid-phase stirred reactor,the partition coefficient H between air and water/silicone oil mixture was obtained by a static headspace method.The maximum fraction of n-hexane transferred from the gas to liquid phase βS^* was calculated by model fitting,and the effectiveness-number of transfer unit method(ε-NTU method) was used to determine the overall volumetric mass transfer coefficient KLa.The results show that the H values decrease significantly with the increased proportion of silicone oil φ and the "Equivalent absorption capacity" model could describe the relation between Hand φ.With the addition of silicone oil,βS^* increases sharply as φ increases,but it decreases with the increase of inlet air flow QG.Moreover,KLa decreases with the increase of(p,but silicone oil induces the increase of saturated liquid n-hexane concentration C^*,thereby increase the overall mass transfer rate of n-hexane.

关 键 词：正己烷 两相分配生物反应器 传质模型 总体积传质系数 

分 类 号：X701.7[环境科学与工程—环境工程]