Interphase Mass Transfer in G-L-S Magnetically Stabilized Bed with Amorphous Alloy SRNA-4 Catalyst

Abstract

Gas-liquid (G-L) and liquid-solid (L-S) mass transfer coefficients were characterized in a gas-liquid-solid (G-L-S) three-phase magnetically stabilized bed (MSB) using amorphous alloy SRNA-4 as the solid phase. Effects such as superficial liquid velocity, superficial gas velocity, magnetic strength, liquid viscosity, and particle size were investigated. Experimental results indicated that the G-L volumetric mass transfer coefficients ( K L a ) increased along with the magnetic strength, superficial gas and liquid velocities. Proper increase of liquid viscosity promoted K L a only in the range of lower liquid viscosity. The external magnetic field made L-S mass transfer coefficients ( K s) in the G-L-S MSB lower than those of conventional fluidized beds. K s in the MSB almost kept constant as the superficial liquid velocity and superficial gas velocity increased and decreased with the liquid viscosity and surface tension, while increased with the particle size K s showed uniform axial and radial distributions except of small decreases close to the wall. Dimensionless correlations were established to estimate K L a and K s of the MSB with SRNA-4 catalysts, which showed the average error of 5.4% and 2.5% respectively.