Micromixing efficiency of rotating packed bed with premixed liquid distributor

Rotating packed bed (RPB), in which high gravity is simulated by a centrifugal force, plays an important role in process intensification of fluid mixing and mass transfer. However, uneven initial liquid distribution in RPB leads to poor micromixing efficiency in local areas of the packing. Therefore, a premixed liquid distributor is proposed in this work to improve the liquid distribution in RPB. Micromixing efficiency of RPB with the premixed liquid distributor was studied by adopting the iodide–iodate reaction as working system and show better micromixing efficiency compared to that of RPB with non-premixed liquid distributor. Also, the effects of operating conditions (e.g. rotational speed, acid concentration, volumetric flow rate) and geometries using the premixed liquid distributor on micromixing efficiency (characterized by segregation index XS) were investigated. The results show that segregation index XS decreases with the increase of rotational speed, and the decrease of acid concentration and volumetric flow rate.

[1]  Partha S. Goswami,et al.  Process Intensification in Rotating Packed Beds (HIGEE): An Appraisal , 2004 .

[2]  Laurent Falk,et al.  A new parallel competing reaction system for assessing micromixing efficiency—Experimental approach , 1996 .

[3]  Colin Ramshaw,et al.  Process intensification: Visual study of liquid maldistribution in rotating packed beds , 1996 .

[4]  A. Green.  PROCESS INTENSIFICATION : THE KEY TO SURVIVAL IN GLOBAL MARKETS? , 1998 .

[5]  Hak-Kim Chan,et al.  Feasibility of preparing nanodrugs by high-gravity reactive precipitation. , 2004, International journal of pharmaceutics.

[6]  Chia-Chang Lin,et al.  Ozone oxidation in a rotating packed bed , 2003 .

[7]  Ryszard Pohorecki,et al.  Turbulent micromixing in chemical reactors - a review * , 1995 .

[8]  John R. Bourne,et al.  Mixing and the Selectivity of Chemical Reactions , 2003 .

[9]  Jianfeng Chen,et al.  Micromixing Efficiency in a Rotating Packed Bed: Experiments and Simulation , 2005 .

[10]  Fen Guo,et al.  Synthesis of Nanoparticles with Novel Technology: High-Gravity Reactive Precipitation , 2000 .

[11]  James R. Fair,et al.  Distillation Studies in a High-Gravity Contactor , 1996 .

[12]  Jianfeng Chen,et al.  Characterization of micromixing efficiency in rotating packed beds by chemical methods , 2006 .

[13]  Jianfeng Chen,et al.  Interaction of macro- and micromixing on particle size distribution in reactive precipitation , 1996 .

[14]  Chia-Chang Lin,et al.  Removal of carbon dioxide by absorption in a rotating packed bed , 2003 .