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  • Continuous synthesis of 2,5-hexanedione through direct C-C coupling of acetone in a Hilbert fractal photo microreactor

    Author(s)
    Zhang, J
    Zhang, S
    Peng, C
    Chen, Y
    Tang, Z
    Wu, Q
    Griffith University Author(s)
    Tang, Zhiyong
    Year published
    2020
    Metadata
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    Abstract
    A novel Hilbert fractal photo microreactor (PMR) was proposed to investigate the photochemical synthesis of 2,5-hexanedione (2,5-HDN) through direct C-C coupling of acetone in the continuous-flow mode. The conventional fluorinated ethylene propylene (FEP) capillary PMR was used for comparison. The flow in the Hilbert fractal PMR was numerically analyzed by computational fluid dynamics (CFD). It was found that the original laminar flow was disturbed by the continuous bending in the Hilbert fractal configuration, leading to irregular distribution of velocity. The secondary flow was intensified by the increasing inlet velocity. ...
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    A novel Hilbert fractal photo microreactor (PMR) was proposed to investigate the photochemical synthesis of 2,5-hexanedione (2,5-HDN) through direct C-C coupling of acetone in the continuous-flow mode. The conventional fluorinated ethylene propylene (FEP) capillary PMR was used for comparison. The flow in the Hilbert fractal PMR was numerically analyzed by computational fluid dynamics (CFD). It was found that the original laminar flow was disturbed by the continuous bending in the Hilbert fractal configuration, leading to irregular distribution of velocity. The secondary flow was intensified by the increasing inlet velocity. Experimental results revealed that the reaction time was shortened by both PMRs from several hours of batch reaction to a couple minutes. Overall, the selectivity to 2,5-HDN decreased with the increasing residence time and H2O2 concentration, while the conversion of acetone followed an opposite trend. Compared with the capillary PMR, the Hilbert fractal PMR exhibited the most advantages at 2.5 min and permitted the increase of the 2,5-HDN selectivity by 7% for 5% H2O2. These observations were attributed to the introduced flow disturbance, leading to the enhanced mass-transfer rate. Furthermore, the Hilbert fractal PMR offered a higher apparent quantum yield (AQY), but its maximum generation rate of 2,5-HDN (10.5 mmol h-1) was lower than that in the capillary PMR (20.2 mmol h-1) mainly due to a much smaller reactor volume. This journal is
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    Journal Title
    Reaction Chemistry and Engineering
    Volume
    5
    Issue
    12
    DOI
    https://doi.org/10.1039/d0re00247j
    Publication URI
    http://hdl.handle.net/10072/408893
    Collection
    • Journal articles

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