盘管式流量逆变微反应器中光化学合成H2O2的研究
收稿日期: 2024-04-07
网络出版日期: 2024-05-11
Study on photochemical synthesis of H2O2 in coiled flow inverter microreactor
Received date: 2024-04-07
Online published: 2024-05-11
为了绿色可持续地便捷化合成H2O2，采用盘管式流量逆变微反应器（CFIMR）进行光激发苯甲醇（BA）合成H2O2的强化研究。系统研究了CFIMR光反应系统中，原料单次停留时间、光强和累计停留时间对光激发BA合成H2O2效率的影响，通过反应-萃取耦合和气-液两相流强化等方法进行了进一步优化。研究结果表明，在CFIMR中，在50 s的最佳单次停留时间下，H2O2平均合成速率（r）为0.563 3 mmol/（L·min）。在最佳的辐照方式下，BA单相流的累计停留时间达到200 s时，BA相中H2O2浓度高达1.762 3 mmol/L。通过引入反应-萃取耦合过程优化技术，简化工艺流程，r可达0.376 2 mmol/（L·min）；在pH=1.0的酸性条件下，r达到最高［1.204 1 mmol/（L·min）］；最佳H2O/BA体积流量比下r为0.458 0 mmol/（L·min）；采用气-液两相流强化方法，r高达0.883 2 mmol/（L·min）。CFIMR内BA单相流、H2O-BA两相流和空气-BA两相流三种方式的r分别达到常规的光激发BA合成H2O2的151.06%、100.88%和236.85%。结果表明，在高光子通量密度和优异混合传质性能的CFIMR内光化学合成H2O2具有操作灵活和高效快速的优势。
马骏 , 金央 , 李军 , 陈明 , 王玉滨 . 盘管式流量逆变微反应器中光化学合成H2O2的研究[J]. 无机盐工业, 2025 , 57(2) : 50 -56 . DOI: 10.19964/j.issn.1006-4990.2024-0195
In order to synthesize H2O2 in a green，sustainable，and convenient manner，the intensified study on the synthesis of H2O2 from benzyl alcohol （BA） under photoexcitation using a coiled flow inverter microreactor（CFIMR） was conducted.The effects of the residence time，light intensity，and cumulative residence time on the efficiency of H2O2 synthesis from BA under photoexcitation in the CFIMR photoreaction system were systematically investigated，and further optimization was carried out through methods such as reaction-extraction coupling and enhancement of gas-liquid two-phase flow.The results of the study showed that in the CFIMR，at the optimal single residence time of 50 s，the average synthesis rate of H2O2（r） was 0.563 3 mmol/（L·min）.Under the optimal irradiation conditions，when the cumulative residence time of the BA single phase reached 200 s，the concentration of H2O2 in the BA phase reached as high as 1.762 3 mmol/L.By introducing reaction-extraction coupling optimization techniques to simplify the process，r was 0.376 2 mmol/（L·min）.Under acidic conditions at pH=1.0，the highest r reached was 1.204 1 mmol/（L·min）.The r under the optimal H2O/BA volume flow rate ratio was 0.458 0 mmol/（L·min）.Through the employment of gas-liquid two-phase flow intensification methods，the maximum value of r reached 0.883 2 mmol/（L·min）.In the CFIMR，the synthesis rates（r） of BA single-phase flow，H2O-BA two-phase flow，and air-BA two-phase flow reached 151.06%，100.88%，and 236.85%，respectively，compared to conventional photoexcited BA synthesis of H2O2.It demonstrated the operational flexibility and high efficiency of photochemical synthesis of H2O2 inside the CFIMR，which was attributed to its high photon flux density and excellent mixing and mass transfer performance.
Key words： coil; microreactor; photochemical synthesis; H2O2; benzyl alcohol
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