Gas-liquid mixing and oxidation reaction rate enhanced by self-inducing impeller

被引：0
|
作者：
Liu Y. [1 ]
Fan B. [2 ,3 ]
Zhang Z. [1 ]
Zheng S. [2 ,3 ]
Zhang Y. [2 ,3 ]
机构：
[1] School of Chemical Engineering and Technology, Tianjin University, Tianjin
[2] National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing
[3] CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2021年 / 40卷 / 12期
关键词：
Hydroxyl radical; Mixing time; Oxidation application; Self-inducing impeller;
D O I：
10.16085/j.issn.1000-6613.2021-0095
中图分类号：
学科分类号：
摘要：
Self-inducing impeller is characterized by enhancing the mixing of multi-phase and homogeneous phase, which is widely used in the fields of chemical engineering and metallurgical engineering. In this article, a new type of self-inducing impeller was presented and its application in enhancing gas-liquid mixing and accelerating oxidation reaction rate was investigated. The influences of agitation speed, power consumption, tracer addition location, gas and liquid self-inducing behaviors on the mixing time were studied. The mixing time was determined by the change of the conductivity of the solution. The results indicated that the mixing time decreased with the increase of the stirring speed and remained relatively stable when the stirring speed exceeded the critical speed of 200r/min. Under the same condition, the self-inducing impeller, operated in gas suction mode at 200r/min, performed similarly with the common impeller running at 350r/min in the mixing time. In addition, when the input power was 0.27kW/m3, the self-inducing impeller operated in liquid suction got same mixing effect as the common impeller for over 1kW/m3. At the same time, the mechanism of the self-inducing impeller in the process of enhancing redox reaction was preliminarily explored with salicylic acid used as active oxygen collector. The result showed that hydroxyl radical was generated during the course of operation of the self-inducing impeller and the concentration of corresponding hydroxylated product reached 73.47μmol/L after 120min. Moreover, the application effect of the self-inducing impeller was systematically studied with ferrous iron as oxidant acceptor and the oxidation efficiency of ferrous iron as characterization parameter. The result suggested that the oxidation efficiency of the self-inducing impeller was better than that of aeration when the pH was 5.0. Under the condition of pH=4.0 and the common temperature, the oxidation efficiency of the self-inducing impeller was up to 30%, which was 10 times that of the conventional impeller. When the rotation speed was more than 300r/min, the increase of rotation speed had little effect on the end point of oxidation equilibrium, but had a great effect on the oxidation rate, that is, the oxidation rate of 400r/min was 30% higher than that of 300 r/min. © 2021, Chemical Industry Press Co., Ltd. All right reserved.
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页码：6620 / 6628
页数：8
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