APPLICATION OF THE SHRINKING CORE MODEL TO LIQUID-SOLID REACTIONS

It is shown that the pseudo steady state approximation in the application of the shrinking core model to liquid-solid reactions is valid even when the ratio of liquid reactant concentration to molar density of the solid is high. In this case the pseudo steady state approximation neglects both the accumulation term and the convective mass transfer term in the mass balance. The respective errors thus introduced have different signs and largely cancel each other. It is also shown that the experimental analysis of liquid-solid reactions can be simplified by a suitable design of batchwise experiments, which also increases the accuracy in parameter estimation. © 1979.