Countercurrent flow mode is widely utilized in many chemical unit operations due to its effective enhancement of mass transfer driving force. While the microbubble column reactor has garnered attention for its substantial gas–liquid specific surface area and fast mass transfer rate under the concurrent flow condition, countercurrent flow microbubble column reactors remain relatively underexplored. Consequently, in this study a novel microbubble generator device featuring gas–liquid co-crossing a microfiltration membrane was developed. This device could generate microbubbles with narrow size distribution, and proved suitable for integration into the countercurrent microbubble column reactor. Further investigation ensued to elucidate the operational principles of this dispersion method. Finally, the hydrodynamic behavior of the countercurrent microbubble column reactor was examined. Remarkably, a gas–liquid-specific surface area 2300 m/m was reached, surpassing that of conventional bubble column reactors by a significant margin. New gas–liquid chemical processes and process intensification technologies could be developed accordingly.

中文翻译：

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微泡塔反应器内气液逆流流动特性


逆流模式因其有效增强传质驱动力而被广泛应用于许多化工单元操作中。虽然微泡塔反应器因其在并流条件下具有较大的气液比表面积和快速的传质速率而受到关注，但逆流微泡塔反应器的开发相对较少。因此，在这项研究中，开发了一种新型微气泡发生器装置，其特征是气液共穿过微滤膜。该装置可以产生窄尺寸分布的微气泡，并被证明适合集成到逆流微气泡塔反应器中。随后进行了进一步的研究，以阐明这种分散方法的操作原理。最后，研究了逆流微泡塔反应器的流体动力学行为。值得注意的是，气液比表面积达到了 2300 m/m，大大超过了传统的泡罩塔反应器。可以相应地开发新的气液化学工艺和工艺强化技术。