writer：Tianqi Liu, Xueping Gu, Linbo Wu, Jiajun Wang*, Lianfang Feng.
keywords：biodegradable polymers, aliphatic-aromatic copolyesters, PBST, coesterification, kenetic modeling
source：期刊
specific source：Macromol React Eng Macromol. React. Eng. 2019, 13(1): 1800069 https://onlinelibrary.wiley.com/doi/pd
Issue time：2019年

Comprehensive mathematical model based on the kinetics and thermodynamic equations is developed to examine a coesterification concept of biodegradable aliphatic-aromatic copolyesters, poly(butylene succinate-cobutylene terephthalate) (PBST). The simulation results for batch process are validated with pilot experimental data. The continuous process is further studied to figure out the coesterification performance of succinic acid (SA) and terephthalic acid (TPA) with different reaction activities and thermodynamic properties in terms of reaction efficiency, small molecular evaporation and product quality. There is a compromise between the operating conditions of the two systems of SA/1,4-butanediol (BDO) and TPA/BDO. Proper pressure reduction is beneficial to reaction efficiency and product quality. The way to increase reaction efficiency by raising temperature is limited due to the serious evaporation of reactants. Influenced by the solid–liquid equilibrium and the slow reaction rate of TPA, the esterification of acid needs sufficient residence time to complete.