Enhanced mass transfer using a novel polymer/carrier microreactor
Enhanced mass transfer using a novel polymer/carrier microreactor
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DOI：
10.1016/j.cej.2004.01.009
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发表时间：
2004-08-01
影响因子：
15.1
通讯作者：
Kunz, U
中科院分区：
文献类型：
--
作者：
Schönfeld, H;Hunger, K;Kunz, U
微反应器由于其两大优点在许多化学反应中获得了广泛的应用：在高放热或吸热反应中具有良好的传热性能和增强的传质性能。考虑到传质的增强，必须区分均相液相反应和非均相反应。用于均相反应的微反应器基于在特殊微混合器内的10-300 μ m范围内的嵌入式微通道。多相应用涵盖了多相催化和固相支撑有机合成领域，由于近年来聚合物载体在固相支撑有机合成和离子交换领域的应用日益受到关注，本研究提出了一种新型聚合物/载体微反应器用于这些应用。微反应器由具有不规则形状通道的大孔无机载体材料和用作有机反应的固体载体的浸没的聚合物相组成。对不同交换离子和不同反应器体系进行了动态离子交换研究。研究了肉桂醛的固相支持选择性还原反应，结果表明，与市售离子交换树脂相比，该反应器能有效地提高肉桂醛向聚合物活性中心的传质速率。(C)2004 Elsevier B. V.保留所有权利。
Microreactors have gained great interest in a large variety of chemical reactions due to two major advantages: excellent heat transfer in the case of highly exothermic or endothermic reactions and enhanced mass transfer. Considering an enhancement of mass transfer one has to distinguish between homogeneous liquid-phase reactions and heterogeneous reactions. Microreactors for homogeneous reactions are based on entwined microchannels in the range of 10-300 mum within special micromixers. Heterogeneous applications cover the field of heterogeneous catalysis and solid-phase supported organic syntheses.Since polymer supports have seen an increasing interest in the field of solid-phase supported organic syntheses and ion exchange applications in the last years, in this study the use of a novel polymer/carrier microreactor for these applications is presented. The microreactor consists of a megaporous inorganic carrier material with irregular shaped channels and an immersed polymer phase which is used as a solid support for organic reactions. Investigations on dynamic ion exchange were conducted for different exchanging ions and different reactor systems. Furthermore the solid-phase supported selective reduction of cinnamaldehyde is studied, a model reaction for the important class of reductions of aldeyhdes in organic chemistry.All results show an enhanced mass transfer to the active sites of the polymer and higher effective rates using the novel microreactor in comparison to commercially available ion exchange resins. (C) 2004 Elsevier B.V. All rights reserved.