Liquid–Solid Hydrodynamics in an Annular Gap Rotating Expanded Bed Reactor

doi:10.1021/acs.iecr.5c02050

Liquid–Solid Hydrodynamics in an Annular Gap Rotating Expanded Bed Reactor

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DOI：10.1021/acs.iecr.5c02050

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Micropacked bed reactors (μPBRs) and expanded bed reactors (EBRs) are well-known for their good performances. However, they still face some challenges, such as high pressure drop in μPBRs and nonideal flow in EBRs. Thus, this work proposes novel annular gap rotating expanded bed reactors (AREBRs). The novel reactor integrates three key features: microparticle packing, a rotating flow field, and slight expansion (expansion ratio <1). The rotating flow field enhances liquid–solid contact, while the slight expansion reduces pressure drop and keeps the short interphase mass transfer distance. To verify the novelty, Al2O3 and SiO2 particles in the micrometer size of 50–100 μm are selected as packed particles, and deionized water is selected as the liquid phase. Several major parameters have been investigated for the change of the expansion ratio and Pe. In comparison with μPBRs, the pressure drop in AREBRs could be reduced by more than 15 times, while compared with EBRs, Pe can be improved by ∼30% with uL ranging from 0.79 ∼ 1.32 mm/s. Meanwhile, the axial solid holdup profile demonstrates significantly improved homogeneity in the AREBRs. The improved flow ideality can ensure stable operation at a relatively high liquid flow velocity. Furthermore, the prediction models for the expansion ratio and Pe are both developed. This study on hydrodynamics can guide the applications of AREBRs in the purification of wastewater containing Cr(VI) by adsorption, synthesis of metal-supported catalysts, etc.

Liquid–Solid Hydrodynamics in an Annular Gap Rotating Expanded Bed Reactor

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