Abstract
Microchannels enable the fast and efficient mixing of multiphase fluids. In this study, a millimeter-scale three-dimensional (3D) circular cyclone-type microreactor was designed for the mixing. The flow characteristics and mixing intensity were simulated by computational fluid dynamics simulations at a flow rate range of 12–96 mL/min using a water/ethyl acetate system. In the 3D variable-diameter structure, the microreactor induced paired opposite vortices and abruptly changed the local pressure to achieve a stable turbulent effect within the theoretical range of laminar flow. Tracer injection simulations indicated that sufficient mixing units successfully promote fluid dispersion. Diazo-coupling experiments showed a segregation index of XS = 0. 00,039 within a residence time of 9 s. Extraction experiments on the n-butanol/succinic acid/water system showed that the 3D circular cyclone-type microreactor achieved 100% extraction efficiency (E) in 4.25 s, and the overall volume mass transfer coefficient (KLa) reached 0.05–1.5 s-1 in 12–96 mL/min. The isolated yield of the phase transfer alkylation and oxidation reactions in the 3D circular cyclone-type microreactor achieved 99% within 36 s, which was superior to the coil microreactor and batch reactor.
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