PET solid-state polycondensation process involves spatial mass transfer of both solid reaction particles and reactor bed

which is a multi-dimensional and multi-phase objective. Aiming at reaction process control

a simplified one-dimensional dynamic model of PET solid-state polycondensation reactor based on existing reaction kinetics models was developed. The model emphasized not only reversible reactions

but also the diffusion of small molecular products inside and outside the particles. It approximated the concentration gradient of small molecular products due to diffusion with an effective coefficient

which borrowed the idea of pseudo-homogeneous fixed bed reactor model. Finally with the experimental data reported in the literature the paper numerically solved the distributed parameter model

which were partial differential equations

and analyzed the dynamic reaction process to get concentration profiles and product quality indices values

which were compared with the data in the literature to show the effectiveness of the developed model.