M5~1 - ABSTRACT In this exp Dissolution of solid-liquid was...

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Unformatted text preview: ABSTRACT In this exp. Dissolution of solid-liquid was studied. The idea of the Exp. Was to put three solid sugar spheres in a vessel containing water and steer the water at different speeds and through the use of two different impellers and measure the different lose in the weight of the sugar balls at different times. The liq-solid mass transfer coefficient Kls was calculated for different speeds and types of impellers as 16.35e-5, 16.39e-5, 16.33e-5, and 26.288e-5 for 3 b (110rpm), 3 b (200 rpm) ,6 b (110rpm) and 6 b(200rpm) respectively. Also , some discussion about the mass transfer and comparing the effect of both speed and number of impellers on mass transfer are included. The error in the KLs values was very high due to reasons that will be discussed later. The error was around 95%. INTRODUCTION solid liquid mass transfer is important in some in industrial applications such as crystallisation , dissolution , and solid liquid extraction. Because of the effectiveness in suspended solid particles and good transfer rate ,agitated vessels are usually used. Physical dissolution takes place in this process by dissolution of solid particles in liquid using different impellers and speeds. THEORETICAL BACKGROUND the relation between mass transfer and agitated liquid for spheres is M = K ls A( C sat-C l ) -----------------------------------------------------------------------1) for batch process they described as dM/dT= -m =-K ls A( C sat-C s )------------------------------------------------------------2) the amount of solid distrubuted in the solid and liquid phase is constant at its initial value M o +V l C lo = M+V l C l------------------------------------------------------------------------3) in this exp we assume that the diameter of the spherical ball are constant so M = ( 4/3 29 r 2 s n-----------------------------------------------------------------4)...
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M5~1 - ABSTRACT In this exp Dissolution of solid-liquid was...

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