الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The objective of the present work is to investigate the effect of using rotating horizontal circular screens instead of solid flat discs to develop a new rotating screen contactor (RSC) suitable for conducting diffusion controlled liquid-liquid operations such as; separation of aromatics and aliphatics in petroleum industry, removal of phenol from waste water, separation of catalyst from reaction products and separation of heat - senstive materials as antibiotics etc. To this end, the performance of horizontal rotating screen in conducting diffusion controlled process was studied by measuring the volumetric mass transfer coefficient for the extraction of acetic acid from toluene - acetic acid mixture by water. The performance of the single and multi screen bed were compared to the traditional solid flat disc.
Variables studied were physical properties [p, J.I. D] of the feed solution (Toluene¬Acetic acid), screen rotation speed, screen mesh number, flow rate of the continuous phase (water) and number of screen per bed. It was found that the rate of mass transfer increase by increasing initial concnetration of acetic acid, screen rotation speed, screen mesh number and contiuous phase flow rate. Also, the effect of using a multiscreen bed of rotating screens was studied, and it was found that the rate of mass transfer decreases by increasing bed thickness. The single screen data were correlated by the following dimensionless equation:
(
-1.38
Shm = 132.63 SC033 Re/25 Re~3 _;h-w
Finally, a comparison between Rotating Screen Contactor (RSC) and Rotating Disc Contactor (RDC) was performed and it was found that the rate of mass transfer increased by an amount ranging from 1379 to 2839% over the value obtained by using RDC depending on the rotation speed and mesh number.
To assist in assessing the economic feasibility of the contactor, mechanical power consumed in rotating the screens were measured under different conditions. Practical applications of the present work in different fields such as pharmaceuticals, metals industry, polymer processing, petroleum industry and effluent treatment were noted.