The mechanism and optimization of secondary droplet fragmentation in the liquid–liquid cyclone reactor for ionic liquid alkylation

IF 13.2 1区工程技术 Q1 ENGINEERING, CHEMICAL

Chemical Engineering Journal Pub Date : 2025-05-09 DOI:10.1016/j.cej.2025.163520

Jinghe Bi , Fuguo Wang , Xinhao Li , Fajian Li , Xiaogang Xu , Sheng Chen , Liyun Zhu , Zhenbo Wang

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Abstract

A novel liquid–liquid cyclone reactor (LLCR) with integrated reaction-separation functionality was developed to optimize ionic liquid alkylation processes. The fragmentation and aggregation of droplets play a crucial role in rapid reaction and separation for the alkylation reaction. The optimal CFD-PBM coupled model was employed to investigate the hydrodynamics, droplet dispersion and secondary droplet fragmentation in the LLCR. Additionally, a targeted optimization strategy was implemented for the cone section design based on droplet fragmentation analysis. The results showed that increased pressure pulsation in the lower cone section of LLCR promotes significant secondary fragmentation of the droplets, achieving an average diameter reduction of approximately 200 μm. However, the majority of the light phases is separated before reaching the lower cone section, which diminishes the mixing enhancement attributable to secondary droplet fragmentation. The optimal 250 mm-parabolic double-cone section enhances secondary fragmentation of the droplets and delays the separation of the light phase, with a reduction of the average droplet diameter by 49.95 μm and an increase of the flow rate by 0.11 m³·h⁻¹ in the lower cone section. Furthermore, the separation efficiency of the light phase increases under various operating conditions, with a maximum light-phase yield increase of 8.41 % and an overall efficiency gain of 10.73 %.

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离子液体烷基化液-液旋流反应器中二次液滴破碎机理及优化

为优化离子液体烷基化工艺，研制了一种具有反应分离功能的新型液-液旋流反应器。液滴的破碎和聚集对烷基化反应的快速反应和分离起着至关重要的作用。采用最优CFD-PBM耦合模型，对LLCR内的流体力学、液滴分散和二次液滴破碎进行了研究。此外，基于液滴破碎分析，实现了锥段设计的针对性优化策略。结果表明，LLCR下锥段压力脉动的增加促进了液滴的二次破碎，平均直径减小约200 μm；然而，大多数轻相在到达下锥段之前就被分离了，这削弱了由于二次液滴破碎而导致的混合增强。优化后的250 mm抛物面双锥截面增强了液滴的二次破碎，延缓了光相的分离，下锥截面的平均液滴直径减小了49.95 μm，流量增加了0.11 m3·h−1。此外，在不同的操作条件下，光相的分离效率都有所提高，最大光相收率提高了8.41%，总效率提高了10.73%。

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来源期刊

Chemical Engineering Journal 工程技术-工程：化工

CiteScore

21.70

自引率

9.30%

发文量

6781

审稿时长

2.4 months

期刊介绍： The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.