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- Title
Insights into reaction kinetics and autocatalysis behavior of propionic anhydride hydrolysis using real-time reaction calorimetry method.
- Authors
Guo, Zichao; Feng, Wei; Shao, Xingyu; Chen, Wanghua
- Abstract
The hydrolysis reactions of anhydride have been frequently used as important model reactions for thermal hazard study. The anhydride hydrolysis reactions are commonly heterogeneous liquid–liquid systems due to the low solubility of anhydride in water. However, since the hydrolysis product, namely organic acid, can increase the solubility of anhydride in water, the anhydride hydrolysis reaction will become homogenous with the reaction progressing. Meanwhile, an apparent autocatalytic feature could be observed in these hydrolysis reactions. This phenomenon brings a great challenge to model the anhydride hydrolysis reactions. In this article, the hydrolysis of propionic anhydride (PA) was taken as a model reaction to study. A reaction model considering both the reaction kinetics and anhydride solubility has been developed on the basis of the reaction mechanism. The reaction process and model parameters were studied using a real-time reaction calorimetry method. The hydrolysis reaction has been confirmed to be kinetically controlled by calculating the Hatta number and studying the influence of stirring speed on the heat flow profiles. The accuracy of this model has also been confirmed by comparing the simulated and experimental heat flow profiles. More importantly, the reason for the autocatalytic behavior of this hydrolysis reaction has been proven to be the enhanced concentration of PA in the aqueous phase, not the hydroxonium ion produced from the dissociation of propionic acid in the aqueous phase.
- Subjects
AUTOCATALYSIS; ORGANIC acids; CALORIMETRY; PROPIONIC acid; NUMBER theory
- Publication
Journal of Thermal Analysis & Calorimetry, 2023, Vol 148, Issue 18, p9585
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-023-12319-6