Abstract
In this study, continuous ozonolysis of terminal alkenes in a rotating zigzag bed was developed. Rotating zigzag bed is a new type high gravity unit relative to the previous rotating packed bed and can intensify mass transfer remarkably. The rotating zigzag bed takes advantage of centrifugal force to mix liquid and gas phase effectively. The H2O in acetone acts as an in situ reducing agent for the carbonyl oxide intermediate, providing aldehydes directly from the reaction mixture. Critical factors were investigated and achieved optimum reaction conditions. Under these conditions, the yields of series aldehydes ranged from 72.3 to 95.8%. The discrepancy in product yields among different olefin substrates likely originates from the electronic stability of the carbonyl oxide intermediate, which is longer lived for aryl olefines with electron donor group and longer carbon chain alkene (CnH2n, n ≥ 10).
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Abbreviations
- G :
-
Gas volumetric flow rate, m3/h
- L :
-
Liquid volumetric flow rate, L/h
- C :
-
Substrate concentration of the liquid phase, mol/L
- \( \beta = \frac{{N^{2} r}}{900} \) :
-
Super gravity factor
- N :
-
Rotational speed, rpm
- \( r = \sqrt {\frac{{r_{\text{i}}^{2} + r_{\text{o}}^{2} }}{2}} \) :
-
Geometric radius, m
- r i :
-
Inner radius of RZB rotor, m
- r o :
-
Outer radius of RZB rotor, m
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Acknowledgements
This work was supported by Key Technology Research Project of Henan Province (No. 152102210043) and Foundation of Henan Educational Committee (No. 16A430045).
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Liang, Z., Wei, T., Xie, J. et al. Direct conversion of terminal alkenes to aldehydes via ozonolysis reaction in rotating zigzag bed. J IRAN CHEM SOC 17, 2379–2384 (2020). https://doi.org/10.1007/s13738-020-01933-y
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DOI: https://doi.org/10.1007/s13738-020-01933-y