Abstract
Three different experiments were carried out in order to estimate the liquid-solid mass transfer coefficient (ks) in a packed bed with porous particles. The experiments were, (A) liquid-phase hydrogenation of maleic acid on Pd-Al2O3, (B) hydrolysis of ethyl acetate on Amberlite 200C, and (C) moment analysis of in-pulse response curve in a packed bed of Amberlite XAD-2. Data were taken at low liquid feed rates and with small particles. The mass transfer factor (jD) which is dimensionless with respect to ks was correlated with the particle Reynolds number (Rep). The obtained values of jD were much lower than those expected from previous correlations obtained from the dissolution of nonporous particles. The results suggested that the effective mass transfer area (as) between liquid and porous particles was less than the geometrical outer surface area of the particles. as was considered to be influenced by the stagnant hold-up and the pore openings.
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