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首页> 外文期刊>International Journal of Heat and Mass Transfer >Gas consumption characteristics determined by gas-liquid two-phase flow coupled with catalytic reaction in a gas-liquid-solid microreactor
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Gas consumption characteristics determined by gas-liquid two-phase flow coupled with catalytic reaction in a gas-liquid-solid microreactor

机译：气液固微反应器中气液两相流与催化反应耦合确定的耗气特性

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In this work, the gas consumption characteristics were investigated by gas-liquid two-phase flow in a capillary microreactor using the catalytic hydrogenation of nitrobenzene as a reference gas-liquid reaction. Image processing technique was used to measure the gas consumption from the variation in the gas phase through the recorded images. The influence of the inlet nitrobenzene concentration and both the gas and liquid flow rates on the gas consumption and the microreactor performance was investigated. The experimental results showed that there existed a discrete hydrogen consumption process, i.e. the waiting stage and inburst stage. Hydrogen consumption was mainly attributed to the waiting stage in each bubble formation cycle. Minimal hydrogen was consumed in the inburst stage. In addition, there was a clear difference between the H-2 consumption rates under each operating condition. As the gas flow rate and nitrobenzene concentration increased, the H-2 consumption rate was gradually decreased with each successive formation cycle. Although the consumption rate was gradually reduced with each successive formation cycle with increasing liquid flow rate, the downward trend became increasingly gradual and clearly stabilized at 20 mu L/min. The microreactor performances under different operating conditions were also investigated. The results showed that the nitrobenzene conversion was first increased and then gradually decreased with increasing the gas flow rate, whereas it was gradually decreased with increasing both the liquid flow rate and nitrobenzene concentration. The results obtained in this work are beneficial for not only understanding process intensification but also promoting the use of microreactor technology in additional industrial applications. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在这项工作中，使用硝基苯的催化加氢作为参考气-液反应，通过在毛细管微反应器中进行气-液两相流动研究了气体消耗特性。图像处理技术用于测量气相变化到记录图像的气体消耗。研究了进口硝基苯浓度以及气体和液体流速对气体消耗和微反应器性能的影响。实验结果表明存在一个离散的氢消耗过程，即等待阶段和突入阶段。氢消耗主要归因于每个气泡形成循环中的等待阶段。侵入阶段消耗的氢气最少。此外，每种工况下的H-2消耗率之间也存在明显差异。随着气体流速和硝基苯浓度的增加，H-2的消耗速率随着每个连续的形成循环而逐渐降低。尽管消耗速率随着液流速率的增加而在每个连续的形成循环中逐渐降低，但下降趋势逐渐增大，并且明显稳定在20μL / min。还研究了在不同操作条件下的微反应器性能。结果表明，随着气体流速的增加，硝基苯转化率先增加，然后逐渐降低，而随着液体流速和硝基苯浓度的增加，硝基苯转化率逐渐降低。这项工作中获得的结果不仅有益于理解工艺强度，而且还有助于在其他工业应用中推广微反应器技术。 （C）2019 Elsevier Ltd.保留所有权利。

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