Solid Holdup and Liquid Backmixing of Liquid-SRNA-4 Catalysts in Magnetically Stabilized Beds

Abstract Solids holdup distribution and liquid backmixing coefficients are fundamental to the scale-up design and optimization of liquid-solid magnetically stabilized reactors.In this article,local solid holdup distribution and liquid backmixing coefficients were analyzed using the bed height-expanded method,the photoelectric method and the transient point source tracer pulse input technique for the liquid-solid magnetically stabilized bed taking the ferromagnetic amorphous alloy catalysts of SRNA-4 as the solid phase.The experimental results showed that the local solid holdup appeared a uniformly axial distribution and a "flat-steep curve" of radial distribution.The solid holdup increased at higher magnetic intensity as well as under larger particle sizes,but decreased at lower liquid viscosity and slower superficial liquid velocity.Axial liquid backmixing coefficients weakened at higher magnetic intensity and liquid viscosity,but enhanced at higher superficial liquid velocity and larger particle size.Based on the experimental data,the equation was established to estimate accurately the axial liquid backmixing Peclet number using physical properties and operating conditions in the magnetically stabilized bed.The experimental results showed they were in accordance with the prediction.

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Received 2006-07-15; published 2006-07-15

Cite this article:

LI Wei,ZHANG Xiao-chen,ZHANG Jin-li,LI Xiao-fang,LU Li-xiang.Solid Holdup and Liquid Backmixing of Liquid-SRNA-4 Catalysts in Magnetically Stabilized Beds[J] Chemcial Industry and Engineering, 2006,V23(4): 283-286