Abstract: A numerical model was designed to simulate the kinetic process of diffusion and reaction of one reactant with another on the interface of droplets in a gelatin layer. The computing procedure of the model was given and its applicability was discussed. Using the combination of the model with experimentally kinetic measurements, the diffusion coefficient of the reactant in gelatin medium and the specific rate constant of the interfacial reaction could be determined and meanwhile the time and spatial distributions of reactants or product in a gelatin layer could also be obtained. When the necessary parameters were available, the model could be used to predict the kinetics under various conditions.

Key words: chemical kinetics, computer simulation, coupling reaction