Study On Micromixing Efficiency And Applications Of Two-Stage Micro-Impinging Stream Reactors

Both micro-channel reactors and impinging-stream reactors can effectively improve the micromixing performance and achieve the intensification of chemical processes. A micro-impinging stream reactor (MISR) was designed and constructed in our lab by combining the advantages of the above two reactors. MISR not only has good performance of micromixing, but also can be manufactured easily. However, a one-stage MISR can only achieve continuous operation for two reaction components without premixing. Therefore, a two-stage micro-impinging stream reactor (TS-MISR) was developed in this work, which could achieve continuous operation for multi-component reaction systems.In this work, TS-MISR was characterized by both experiment and simulation and then Ni-Co-O composites were prepared by TS-MISR. Firstly, the effects of jet Reynolds and secondary volumetric flow ratio on the micromixing were studied by experiment and simulation. The results of experiment and simulation agreed well, both indicating that the micromixing efficiency in the second-stage micro-impinging stream reactor was greatly influenced by the jet Reynolds and secondary volumetric flow ratio. Then, the effects of first-stage junction angle, connecting capillary length and connecting capillary diameter on premixing were studied by simulation. The numerical results demonstrated that the best first-stage junction angle was 180°, the connecting capillary length had an optimum value, and the connecting capillary diameter preferred smaller sizes for the intensified micromixing efficiency at the same inlet jet Reynolds. Finally, Ni-Co-O composites were prepared by TS-MISR, and the effects of different total ion molar concentration of Ni2+ and Co2+ and aging temperature on the morphology and electrochemical properties of the prepared Ni-Co-O composites were studied, which verified the advantages of TS-MISR in the applications of multi-component synthesis.