Abstract
To obtain the kinetic parameters of the chemical reaction between polyvinyl alcohol (PVA) and n-butanal, a microreactor-based experimental platform, and the corresponding analysis methods, was developed. This information is important and required to obtain an in-depth understanding of the reaction and to control the polyvinyl butyral (PVB) synthesis process. Experimental results showed that the protonation of n-butanal had a low equilibrium constant, and the reverse reaction, involving the generation of hemiacetal, had a significant effect on total reaction rate, resulting in consistently low concentrations of hemiacetal. Measurement of the time-variation of hydroxyl, hemiacetal, and acetal concentrations provided the rate constants and activation energies for the multi-step reaction kinetic model. Finally, this model was used to estimate the variation of specie concentrations at early reaction time points assuming practical PVB synthesis conditions, which provided guidance for the enhancement of this synthetic process.
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