الفهرس 
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Abstract
The present work is concerned with the study of the solid-liquid transfer behaviour of a batch fixed bed reactor packed with Raschig and operated under (i) single-phase flow, ~(ii) gas sparging and two-phase flow. This study was carried out using the diffusion ntrolled dissolution of copper in acidified dichromate solution. For ch mode of stirring the following variables were studied:Electrolyte concentration and the physical properties of the solution :viscosity, density and diffusivity) . Superficial gas and liquid velocities . Raschig ring diameter. The study revealed the following results: . For single phase forced convection, the mass transfer coefficient with the superficial liquid velocity according to the
K a V 0.475 l
For single phase forced convection, the mass transfer coefficient with increasing Raschig ring diameter according to the
K d -0.6
a r
3. Mass transfer data under single phase flow were correlated for the conditions: 825 < Sc < 1510, 5 < Rel < 246 and 0.6 cm 1.2 cm
370.
J = 2.26 Rel-o.57
gas sparged beds, the mass transfer coefficient increases with
superficial gas velocity according to the relation
K a V 0.575 g
The mass transfer coefficient at the gas sparged bed decreases with reasing Raschig ring diameter according to the relation: For gas sparged beds, the mass trasnfer data were correlated for the jditions: 0.01737 < Fr * Reg < 11.3206, 1043 < Sc < 1486 and 0.6 cm Pr < 1.2 cm by the equation:
; For two phase flow, the mass trasnfer coefficient for a given
~-
gas velocity increases with the superficial liquid velocity to the relation:
K a V 0.35 l