Characterization and modeling of micromixing performance in micropore dispersion reactors

Abstract Micropore dispersion reactors have been considered as one of the most promising micro-structured devices. For reliable design of this kind of microreactors, the micromixing performance in those microreactors with different detailed geometric structures have been investigated in this work. The pore size, pore shape, pore number and pore distance were varied and the micromixing performance was characterized by the Villermaux/Dushman parallel competing reaction. The results showed that the mixing performance was greatly influenced by the geometric structures. The segregation indexes, X S , were found in the range of 10 −2 to 10 −3 , indicating that the micropore dispersion reactors have high micromixing efficiency. To deeply understand the micromixing process, CFD simulation was carried out to describe the flow fields in the reactors. Based on the simulation results a mathematical model was developed and a new area parameter, S , was defined by considering both mixing region surface and mass transfer distance. A linear relationship between S and lg( X S ) was obtained at last, which is very helpful for optimizing the structure design of micropore dispersion reactors.

[1]  Michael A. Sprague,et al.  A simple three-dimensional vortex micromixer , 2009 .

[2]  H. Hoefsloot,et al.  The influence of micromixing on molecular weight distribution during controlled Polypropylene degradation in a static mixer reactor , 2001 .

[3]  Matthias Kind,et al.  Macro- and Micromixing in a Taylor-Couette Reactor with Axial Flow and their Influence on the Precipitation of Barium Sulfate , 2004 .

[4]  Jianhong Xu,et al.  Membrane dispersion precipitation method to prepare nanopartials , 2004 .

[5]  M. Ward,et al.  Micro T-mixer as a rapid mixing micromixer , 2004 .

[6]  Jianhong Xu,et al.  Synthesis and size control of CaHPO4 particles in a two-liquid phase micro-mixing process , 2005 .

[7]  Duu-Jong Lee,et al.  Micromixing efficiency in static mixer , 2001 .

[8]  Laurent Falk,et al.  A new parallel competing reaction system for assessing micromixing efficiency—Experimental approach , 1996 .

[9]  Yu Chen,et al.  Micrometer‐sized monodispersed silica spheres with advanced adsorption properties , 2008 .

[10]  Peter Styring,et al.  The use of a novel microreactor for high throughput continuous flow organic synthesis , 2000 .

[11]  K. Schubert,et al.  The iodide iodate method to characterize microstructured mixing devices , 2008 .

[12]  Christian Schwede,et al.  Characterization of Mixing Efficiency in Polymerization Reactors Using Competitive‐Parallel Reactions , 2007 .

[13]  Jerzy Bałdyga,et al.  The effect of micromixing on parallel reactions , 1990 .

[14]  Shaowei Li,et al.  Mesomixing scale controlling and its effect on micromixing performance , 2007 .

[15]  Jack Legrand,et al.  Characterisation and comparison of the micromixing efficiency in torus and batch stirred reactors , 2008 .

[16]  Jianfeng Chen,et al.  Characterization of micromixing efficiency in rotating packed beds by chemical methods , 2006 .

[17]  Jianhong Xu,et al.  Liquid–liquid two‐phase flow in pore array microstructured devices for scaling‐up of nanoparticle preparation , 2009 .

[18]  Roland Kieffer,et al.  Characterization of mixing in a hollow fiber membrane contactor by the iodide–iodate method: Numerical simulations and experiments , 2009 .

[19]  H. Löwe,et al.  Chemistry in microstructured reactors. , 2004, Angewandte Chemie.

[20]  J. Villermaux,et al.  Characterisation of micromixing efficiency by the iodide–iodate reaction system. Part II: kinetic study , 2000 .

[21]  Miguel A. Galán,et al.  On the contribution of the scales of mixing to the oxygen transfer in stirred tanks , 2008 .

[22]  Kai Wang,et al.  Reducing side product by enhancing mass‐transfer rate , 2006 .

[23]  Hiroyuki Nakamura,et al.  Development of a microreactor for amino acid polymerization , 2007 .

[24]  K. Mae,et al.  Development of a New Microreactor Based on Annular Microsegments for Fine Particle Production , 2006 .

[25]  Chen Guangwen.  MICRO-CHEMICAL TECHNOLOGY , 2003 .

[26]  Shangfu Li,et al.  Experimental approaches for understanding mixing performance of a minireactor , 2005 .

[27]  L. Falk,et al.  Characterisation of micromixing efficiency by the iodide–iodate reaction system. Part I: experimental procedure , 2000 .