微通道中液-液萃取传质特性的研究

摘要研究了在一个内径为400 μm管式直线型玻璃微通道中的液-液两相的传质特性，其中去离子水为水相, 煤油（溶质是苯甲酸）为油相, 氮气为气相。实验研究了表面张力、黏度和气体分散相对体积传质系数的影响，结果表明：在内径为400 μm的微通道内，当停留时间为15 s时微通道内的萃取已达到平衡；水相的表面张力和液体黏度显著影响微通道内的传质效率；在液-液系统中引入气相后，水油两相之间的传质效率显著增加。

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	李韡
	张昱
	孟昊
	冯子洋
	张金利

关键词：微通道液-液两相传质

Abstract： Mass transfer characteristics of liquid-liquid two-phase flow were studied in a straight tubular microchannel with a diameter of 400 μm, with deionized water as the water phase, kerosene (the solute is benzoic acid) as the oil phase and nitrogen as the gas phase. The effects of interfacial tension, viscosity and dispersed gas were investigated on the volumetric mass transfer coefficients. The results show that the extraction equilibrium is reached in the microchannel as the residence time is longer than 15 s. Liquid interfacial tension and viscosity significantly influence extraction efficiency and volumetric mass transfer coefficient. The existence of dispersed gas phases can intensify greatly liquid-liquid mass transfer efficiency.

Keywords： microchannel liquid-liquid two-phase mass transfer

Received 2012-06-11;

Fund:

国家自然科学基金资助项目(20836005)；国家重大专项资金基础研究项目(2012CB720300)。

Corresponding Authors: 张金利，E-mail: zhangjinli@tju.edu.cn。 Email: zhangjinli@tju.edu.cn

About author: 李韡（1971-），女，教授，主要从事绿色合成与转化研究。

引用本文:

李韡, 张昱, 孟昊, 冯子洋, 张金利.微通道中液-液萃取传质特性的研究[J]. 化学工业与工程, 2013,30(4): 36-41

LI Wei , ZHANG Yu, MENG Hao, FENG Zi-Yang, ZHANG Jin-Li.Mass Transfer Characteristics of Liquid-Liquid Extraction in Microchannel[J]. Chemcial Industry and Engineering, 2013,30(4): 36-41