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Kinetics of polyvinyl butyral hydrolysis in ethanol/water solutions

  • Catalysis, Reaction Engineering
  • Published:
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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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Abbreviations

PVB:

polyvinyl butyral

PVA:

polyvinyl alcohol

HH:

hydroxylamine hydrochloride

AD:

acetalization degree

IP:

induction period

AG:

acetal group

xe :

mole fraction of ethanol in mixed ethanol/water solvents

t0 :

the duration of the induction period [min]

Y expi :

experimental conversion rate

Y cali :

calculated conversion rate

kED :

kinetic parameter of the model controlled by external diffusion

kID :

kinetic parameter of the model controlled by internal diffusion

k R :

kinetic parameter of the model controlled by chemical reaction

S:

objective function

AAD:

absolute average deviation

T:

temperature [K]

Ea :

activation energy [kJ mol−1]

R:

a constant of ideal gas [J mol−1 K−1]

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Acknowledgement

We gratefully acknowledge financial support from Sinopec Shanghai Research Institute of Petrochemical Technology (420094).

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Author notes

  1. W.L. and C.W. contributed equally to this work and should be considered co-first authors.

Authors and Affiliations

  1. School of Chemical Engineering, East China University of Science and Technology, 200237, Shanghai, China

    Wenwen Luan, Chunyu Wang, Zuoxiang Zeng, Weilan Xue & Xuelian He

  2. Sinopec Shanghai Research Institute of Petrochemical Technology, 201208, Shanghai, China

    Yu Bai

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  1. Wenwen Luan
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  2. Chunyu Wang
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  3. Zuoxiang Zeng
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  4. Weilan Xue
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Correspondence to Zuoxiang Zeng.

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Luan, W., Wang, C., Zeng, Z. et al. Kinetics of polyvinyl butyral hydrolysis in ethanol/water solutions. Korean J. Chem. Eng. 38, 1810–1817 (2021). https://doi.org/10.1007/s11814-021-0857-6

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  • DOI: https://doi.org/10.1007/s11814-021-0857-6

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