LIQUID-SOLID MASS-TRANSFER IN A BATCH-PACKED BUBBLE-COLUMN

The effect of N-2 sparging on the rate of liquid-solid mass transfer a t fixed beds of spheres was studied by measuring the rate of diffusion -controlled dissolution of a bed of copper spheres in acidified chroma te solution. The variables studied were the sphere diameter, the bed h eight, the N-2 flow rate and the physical properties of the solution. The data were correlated by the following equations depending on bed d epth. (i) For beds of large depth (L/d > 0.1), the data fit the equati on J = 0.017(Fr Re)(-0.167) (d(s)/d)(-0.61) (L/d)(-0.71) (ii) For beds of small depth (L/d<0.1), the data fit the equation J = 0.33+0.00575( Fr Re)(-0.167) (d(s)/d)(-0.61) (L/d)(-0.71)