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 char-acteristics 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.
NETL
NSTL
万方数据