A new parallel competing reaction system for assessing micromixing efficiency - Experimental approach
A new parallel competing reaction system for assessing micromixing efficiency - Experimental approach
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DOI：
10.1016/0009-2509(96)00270-9
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发表时间：
1996-11-01
影响因子：
4.7
通讯作者：
Villermaux, J
中科院分区：
文献类型：
--
作者：
Fournier, MC;Falk, L;Villermaux, J
在分子尺度上研究搅拌反应器中的混合状态有多种方法。电导法和光学法的分辨率不够。因此，这项工作的目的是提出一种化学反应，作为分子探针评估微观混合效率。文献综述表明，可用的测试反应数量有限。本文提出了一个新的平行竞争反应系统A + B --> R和C + v B--> S，由此可以研究工业反应器中的微观混合状态。第一个反应是中和反应，第二个反应是碘化物和碘酸盐之间的Dushman反应。我们表明，在碱性介质（A）中，在酸（B）的影响下碘（S）的形成是分离的量度。该系统使研究加料时间、加料位置和反应物浓度对偏析的影响成为可能。该方法通过在一升和二十升的标准搅拌罐中混合的研究进行了验证。提出了扩展规则。版权所有（C）1996 Elsevier Science Ltd
Several kinds of methods can be used in order to study the state of mixing at molecular scale in stirred reactors. Conductometric and optical methods have not enough resolution. The aim of this work is therefore to propose a chemical reaction which acts as a molecular probe for assessing micromixing efficiency. A literature review shows that the number of available test reactions is limited. We propose a new system of parallel competing reactions A + B --> R and C + vB --> S whereby the state of micromixing in industrial reactors can be studied. The first reaction is a neutralization, the second one is the Dushman reaction between the iodide and iodate. We show that the formation of iodine (S) under the influence of an acid (B) in an alkaline medium (A) is a measure of segregation. This system makes it possible to study the influence of feed time, feed location and reactant concentrations on segregation. The method is validated by a study of mixing in standard stirred tanks of one and twenty litres. Scale-up rules are proposed. Copyright (C) 1996 Published by Elsevier Science Ltd