Intensifying micromixing in a semi-batch reactor using a Rushton turbine

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• 作者：Assirelli ; Melissa ; Bujalski ; Waldemar ; Eaglesham ; A. ; Nienow ; A.W.
• 关键词：Semi-batch reactor ; Micromixing ; Intensification ; Rushton turbine ; Competing fast reactions
• 刊名：Chemical Engineering Science
• 出版年：2005
• 期刊代码：18_00092509
• 类别：ce
• 出版时间：April - May, 2005
• 卷：60
• 期：8-9
• 页码：2333-2339
• 文件大小：254 K

摘要

The ‘iodide–iodate’ reaction scheme has been used to ascertain the effectiveness of micromixing in a semi-batch reactor when feeding with pipes rotating and discharging continuously into the region of highest local specific energy dissipation rate, ε_T. The results are compared with those obtained using a fixed pipe at the equivalent position and at other positions including near the top surface, the most convenient position industrially. The results show significant intensification, i.e., a seven-fold reduction in ‘waste product’, between the most convenient fixed feed pipe position and the rotating pipes, even at the modest specific power input of . This mode of addition also ensures that feeding is always into a constant value of ε_T, whereas with a static pipe close to the impeller the reactants are being fed in a region where ε_T varies cyclically. This difference in the ε_T values experienced by the two modes of addition poses problems for previous models of micromixing in the literature linking selectivity to local specific energy dissipation rates.