关键词: 固相缩聚, 分布参数, 拟均相, 动态模型

Abstract:

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.

Key words: 固相缩聚, 分布参数, 拟均相, 动态模型