Preparation of Insoluble Bis(2-bromoacetyl)biphenyl via a Photoultrasound Enhanced Continuous Flow Reaction

联苯 动能 化学 流动化学 间歇式反应器 连续反应器 卤化 体积流量 反应速率 化学工程 材料科学 热力学 催化作用 有机化学 量子力学 物理 工程类
作者
Fujun Li,Zhaoyan Guo,Wenbo Yang,Yumeng Zhou,Yue Ru,Guicun Qi,Dali Gao,Shengyang Tao
出处
期刊:Industrial & Engineering Chemistry Research [American Chemical Society]
卷期号:62 (37): 15290-15299
标识
DOI:10.1021/acs.iecr.3c01818
摘要

In continuous multiphase flow photochemical reactions, the generation of insoluble materials can significantly reduce the efficiency of material and light energy transfer between interfaces due to numerous interfaces within the hybrid system. The problem of solids blocking pipelines further compounds this issue. This study presents the design and construction of an optical-ultrasonic coupled continuous flow reactor to synthesize the insoluble α-bromoketone (4,4′-bis(2-bromoacetyl)biphenyl) is continuously produced in situ for synthesis, eliminating the need for large quantities of toxic bromine. A flowing cooling medium enhanced the ultrasound power transfer and eliminated the thermal effects of the ultrasound and light sources under TR = 2.1 min, T = 20 °C, and a flow cooling medium thickness of 1.5 cm. The reactants were converted to 92.4% and yielded up to 90.2%, significantly better than the batch reactor results. The experimental results show that the product particles are reduced considerably under ultrasound, eliminating the blockage. Free radical capture experiments investigated the stepwise bromination mechanism, kinetic parameters were calculated, and the reaction rate expressions derived from the basic steps were consistent with the kinetic model. These findings provide valuable insights into the reaction process, contributing to a more comprehensive understanding.
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