Diffusion model for dehydrogenation of isoamylenes to isoprene in a fixed bed of iron-potassium catalyst

Abstract

A mathematical model was suggested for the dehydrogenation of isoamylenes to isoprene in a fixed bed reactor with industrial selfregenerating iron-potassium catalysts KDOM and ZhKD. The model takes into account the size and shape of catalyst grains, rate constants and activation energies of direct (dehydrogenation) and reverse (hydrogenation) reactions, rate constants and activation energies of cracking and self-regeneration, and accumulation of leachable and non-leachable coke. The model adequately describes physical and chemical processes occurring during dehydrogenation of isoamylenes in industrial reactors at different loadings of ironpotassium catalysts and at various regimes of reactor operation (loading of raw material, dilution of raw material with steam, temperature and pressure at the reactor inlet) and allows the optimization of technological parameters of the industrial process.