L–S mass transfer in G–L–S countercurrent magnetically stabilized bed with amorphous alloy SRNA-4 catalyst

Liquid–solid (L–S) mass transfer coefficients (K_s) were characterized in a gas–liquid–solid (G–L–S) three-phase countercurrent magnetically stabilized bed (MSB) using amorphous alloy SRNA-4 as the solid phase. Effects of superficial liquid velocity, superficial gas velocity, magnetic field strength, liquid viscosity and surface tension were investigated. Experimental results indicated that the external magnetic field increased K_s in three-phase MSB, as compared to those in conventional G–L–S fluidized beds; that K_s increased with magnetic field strength, superficial gas and liquid velocities and decreased with liquid viscosity and surface tension; and that K_s showed uniform axial and radial distributions except for small increases close to the wall. Dimensionless correlations were established to estimate K_s of the G–L–S countercurrent MSB using SRNA-4 catalyst, with an average error of 3.6%.