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Reaction Performance and Flow Behavior of Isobutane/1-Butene and H2SO4 in the Microreactor Configured with the Micro-mixer
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2022-06-13 , DOI: 10.1021/acs.iecr.2c01664 Xu Wang 1 , Tao Zhang 1 , Li Lv 1 , Wenxiang Tang 1 , Raju Kumar Gupta 2 , Shengwei Tang 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2022-06-13 , DOI: 10.1021/acs.iecr.2c01664 Xu Wang 1 , Tao Zhang 1 , Li Lv 1 , Wenxiang Tang 1 , Raju Kumar Gupta 2 , Shengwei Tang 1
Affiliation
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The alkylation reaction of isobutane and 1-butene catalyzed by H2SO4 is a typical liquid–liquid heterogeneous reaction. Mass transfer is the limiting step. Configuring specific micro-mixing structures is useful to intensify the mass transfer and reaction performance in microchannels. A microreactor configured with contraction–expansion structures and triangular obstacles was used to improve the mixing and reaction performance of the isobutane alkylation process. The results show that the volumetric mass transfer coefficient in the microreactor configured with a micro-mixer was over 27 times of that in the stirring reactor and the reaction conversion reached 95.7% at only 12 s. In microchannels, hydrocarbons were dispersed in H2SO4 as droplets. In the microchannel configured with contraction–expansion structures and triangular obstacles, droplets could be effectively split and more than half of droplets were less than 0.4 mm. The specific interfacial area in the microchannel configured with contraction–expansion structures and triangular obstacles was 36% higher than that of the smooth microchannel. Moreover, the microreactor configured with contraction–expansion structures and triangular obstacles brought a strong velocity fluctuation, a big velocity difference between the hydrocarbon phase and the H2SO4 phase, and strong vortices in droplets. All these factors accelerated the surface renewal and greatly improved the mixing and mass transfer performance. The mechanism of droplet splitting under the synergetic effect of contraction–expansion structures and triangular obstacles was also studied. The research results are useful to design new microreactors for the reaction limited by mass transfer.
中文翻译：
配置微混合器的微反应器中异丁烷/1-丁烯和 H2SO4 的反应性能和流动行为
H 2 SO 4催化的异丁烷和1-丁烯的烷基化反应是典型的液-液多相反应。传质是限制步骤。配置特定的微混合结构有助于增强微通道中的传质和反应性能。使用具有收缩-膨胀结构和三角形障碍物的微反应器来改善异丁烷烷基化过程的混合和反应性能。结果表明，配置微型混合器的微型反应器的体积传质系数是搅拌反应器的27倍以上，反应转化率仅12 s就达到95.7%。在微通道中，碳氢化合物分散在 H 2 SO 4中作为液滴。在具有收缩-膨胀结构和三角形障碍物的微通道中，液滴可以有效分裂，一半以上的液滴小于0.4 mm。具有收缩-膨胀结构和三角形障碍物的微通道中的比界面面积比光滑微通道高36%。此外，收缩-膨胀结构和三角形障碍物配置的微反应器带来了强烈的速度波动，烃相与H 2 SO 4之间的速度差很大。相和液滴中的强涡流。所有这些因素加速了表面更新，大大提高了混合和传质性能。还研究了在收缩-膨胀结构和三角形障碍物的协同作用下液滴分裂的机制。研究结果有助于为受传质限制的反应设计新的微反应器。
更新日期：2022-06-13
中文翻译：
配置微混合器的微反应器中异丁烷/1-丁烯和 H2SO4 的反应性能和流动行为
H 2 SO 4催化的异丁烷和1-丁烯的烷基化反应是典型的液-液多相反应。传质是限制步骤。配置特定的微混合结构有助于增强微通道中的传质和反应性能。使用具有收缩-膨胀结构和三角形障碍物的微反应器来改善异丁烷烷基化过程的混合和反应性能。结果表明，配置微型混合器的微型反应器的体积传质系数是搅拌反应器的27倍以上，反应转化率仅12 s就达到95.7%。在微通道中，碳氢化合物分散在 H 2 SO 4中作为液滴。在具有收缩-膨胀结构和三角形障碍物的微通道中，液滴可以有效分裂，一半以上的液滴小于0.4 mm。具有收缩-膨胀结构和三角形障碍物的微通道中的比界面面积比光滑微通道高36%。此外，收缩-膨胀结构和三角形障碍物配置的微反应器带来了强烈的速度波动，烃相与H 2 SO 4之间的速度差很大。相和液滴中的强涡流。所有这些因素加速了表面更新，大大提高了混合和传质性能。还研究了在收缩-膨胀结构和三角形障碍物的协同作用下液滴分裂的机制。研究结果有助于为受传质限制的反应设计新的微反应器。
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