Hydrolysis of acetic anhydride: in situ, real-time monitoring using NIR and UV–Vis spectroscopy
| Autor: | Maria Magdalena Espinola Colmán, Maria G. F. Torraga, Reinaldo Giudici |
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| Rok vydání: | 2019 |
| Předmět: |
Exothermic reaction
Materials science Applied Mathematics General Chemical Engineering CINÉTICA Inorganic chemistry technology industry and agriculture 02 engineering and technology General Chemistry Calorimetry Chemical reactor 021001 nanoscience & nanotechnology Industrial and Manufacturing Engineering Hydrolysis Acetic anhydride chemistry.chemical_compound Ultraviolet visible spectroscopy 020401 chemical engineering chemistry Calibration 0204 chemical engineering 0210 nano-technology Spectroscopy |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | Hydrolysis of acetic anhydride is a fast and very exothermic reaction that has been studied with different analytical techniques to account for the reaction progress. This work presents the real-time monitoring of the hydrolysis of acetic anhydride using in situ NIR and UV–Vis spectroscopy, under non-isothermal and non-adiabatic conditions. The experimental apparatus consists of a reaction vessel equipped with a magnetic stirrer, NIR and UV–Vis immersion probes and a thermocouple. Two multivariate models are proposed to account for the conversion of acetic anhydride as a function of time, one for NIR and other for UV–Vis. The calibration data were generated by calorimetry. The external validation permits the assessment of the adherence of the model to data not used for calibration. The results show that both models can be useful to monitor this hydrolysis, employing a simple and intuitive apparatus. |
| Databáze: | OpenAIRE |
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