Experimental Study on Mass Transfer within Pressed Shaped Porous Solid

Drying Rate of Various Liquids Contained in Silica-alumina Catalyst

Abstract

An experimental investigation of the Fick modelfor ffusion have been made of a liquid phase transfer wtporous solida of different shape-sizes. The restective speci of alcohols, hydrocarbons and carbontetrachloride was impregnated and contained uniformly in the pores of cylindrical or ring type silicaaluminas. The transfer (drying) rates were measured using the thermanobalance in constant air flow and low temperature (25 to 70°C), under which the vapor pressure was markedly low and the external mass transfer resistance was almost negligible. It was confirmed that these rates obey the unsteady state diffusion model macroscopically under constant overall effective diffusivity, De except for the case water transfer. and that this procedure is simple and accurate for the estimation of De, the characteristics of Pore structrues.