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Received March 14, 2021
Accepted May 23, 2021
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Kinetics of polyvinyl butyral hydrolysis in ethanol/water solutions
School of Chemical Engineering, East China University of Science and Technology, 200237 Shanghai, China 1Sinopec Shanghai Research Institute of Petrochemical Technology, 201208 Shanghai, China
zengzx@ecust.edu.cn
Korean Journal of Chemical Engineering, September 2021, 38(9), 1810-1817(8), 10.1007/s11814-021-0857-6
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Abstract
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.
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