Stability Analysis of Reactive Multiphase Slug Flows in Microchannels

Processes

Alejandro A. Munera Parra²  Nicolai Antweiler¹  Rachit Nagpal² 

[1] Laboratory of Chemical Reaction Engineering, Department of Biochemical and Chemical Engineering, Technical University of Dortmund, Dortmund 44227, Germany;

关键词: numbering-up;    slug flow;    flow stability;    multiplicities;    extraction;   

DOI  :  10.3390/pr2020371

来源: mdpi

【 摘 要 】

Conducting multiphase reactions in micro-reactors is a promising strategy for intensifying chemical and biochemical processes. A major unresolved challenge is to exploit the considerable benefits offered by micro-scale operation for industrial scale throughputs by numbering-up whilst retaining the underlying advantageous flow characteristics of the single channel system in multiple parallel channels. Fabrication and installation tolerances in the individual micro-channels result in different pressure losses and, thus, a fluid maldistribution. In this work, an additional source of maldistribution, namely the flow multiplicities, which can arise in a multiphase reactive or extractive flow in otherwise identical micro-channels, was investigated. A detailed experimental and theoretical analysis of the flow stability with and without reaction for both gas-liquid and liquid-liquid slug flow has been developed. The model has been validated using the extraction of acetic acid from n-heptane with the ionic liquid 1-Ethyl-3-methylimidazolium ethyl sulfate. The results clearly demonstrate that the coupling between flow structure, the extent of reaction/extraction and pressure drop can result in multiple operating states, thus, necessitating an active measurement and control concept to ensure uniform behavior and optimal performance.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.