Kinetics of polyvinyl butyral hydrolysis in ethanol/water solutions

• Published in: The Korean journal of chemical engineering Vol. 38; no. 9; pp. 1810 - 1817
• Main Authors: Luan, Wenwen, Wang, Chunyu, Zeng, Zuoxiang, Xue, Weilan, He, Xuelian, Bai, Yu
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.09.2021; Springer Nature B.V; 한국화학공학회
• Subjects: Biotechnology; Catalysis; Catalytic activity; Chemical reactions; Chemistry; Chemistry and Materials Science; Ethanol; Hydrolysis; Industrial Chemistry/Chemical Engineering; Kinetics; Materials Science; Polyvinyl acetal resins; Polyvinyl butyral; Reaction Engineering; Solvents; 화학공학; Shrinking Core Model; Kinetics; Induction Period; Water-ethanol Clusters; Polyvinyl Butyral
• ISSN: 0256-1115; 1975-7220
• DOI: 10.1007/s11814-021-0857-6

The hydrolysis kinetics of polyvinyl butyral (PVB) was studied in ethanol/water mixed solvents in the temperature range of 339.15-355.15 K, and a three-step hypothesis was proposed to describe the hydrolysis process. The influences of stirring speed, ethanol content and temperature on the hydrolysis of PVB were investigated, and an induction period (IP) phenomenon was found in the process of PVB hydrolysis. The ethanol content in the mixed solvents has a great influence on IP, which is due to the formation of the two kinds of water-ethanol clusters in the system. Temperature influences the IP by changing the catalytic activity of hydroxylamine hydrochloride (HH) on the hydrolysis of PVB. The shrinking core models with three controlling steps were used to fit the kinetic data, and the results indicate that the model controlled by chemical reaction is suitable to describe the kinetic behavior of PVB hydrolysis.