الفهرس 
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Abstract
The present work deals with the liquid - solid mass transfer behaviour of fixed beds of Lessing rings under single phase tlow and co-current upward two phase tlow will! a view to ihc latimial design and operation of catalytic and electrochemical reactors used to conduct liquid - solid and liquid - solid - gas diffusion conlrolleit reactions
The study was carried out using the electrochemical technique which involves measuring the limiting current of the cathodic reduction of potassium ferricyanide in large excess of NaOH The effect of tlie following variable on the rale of mass transfer was studied. . Lessing rings diameter.
2 Physical properties of solution e g solution density, solution viscosity and diitusivity of react ant
3 Flow rate of solution.
4 Air flow rate.
5. The effect of drag reducing additives, e.g, Polyox WSR-301, on the rate of mass
transfer.
6 The effect of surfactants for example e.g Triton on the rale mass transfer The study revealed the following results’
1 For single phase flow, the mass transfer coefficient increased with increasing the liquid tlow rate and decreased with increasing Lessing rings diameter
2 Mass transfer data under single phase flow were correlated for conditions
U9I < Sc<4763, 166< ReL < 722 88 and 10
1391 •- Sc <47t>3, 144 < Rei < 748 .6] •-• Re,
4 The presence of drag polymer (Polyox) was found to decrease the rate of mass transfer in single phase flow by an amount ranging from 17.2 to 32 7 % depending on Polyox concentration and liquid flow rate.