Análisis de la cinética química de una mezcla de polipropileno y poliestireno a tres tasas de calentamiento

Abstract

The objective of this Curricular Integration Work was to determine the chemical kinetics of the thermal degradation reaction of a mixture of polypropylene and polystyrene in a percentage ratio of 25:75 in the presence of an FCC catalyst, using plastic waste from recycling companies located in Riobamba, province of Chimborazo. For the determination of the chemical kinetics of the sample, a thermo balance was used by applying a dynamic study, at three heating rates of 5,10 and 15 °C/min in an inert atmosphere by dynamic study, at three heating rates 5,10 and 15 °C/min in an inert atmosphere by injecting nitrogen at a flow rate of 20mL/min from room temperature up to 750 °C. Nitrogen at a flow rate of 20mL/min from room temperature up to 750 °C. The results obtained were analyzed by means of the Microsoft Excel application in order to know the kinetic model that best describes the thermal degradation of the sample and in this way to calculate the thermodynamic parameters. Finally, the Microsoft Excel SOLVER add-in and Fisher's statistical method resulted that the kinetic model that best fits the thermal degradation of the sample was the Starink model because it has a coefficient of determination close to and a lower activation energy compared to the Friedman, Miura-Maki, FWO and KAS models. It is recommended to complement the study with other thermal analysis techniques such as Differential Scanning Calorimetry (DSC), X-Ray Diffraction (XRD) and FTIR X-Ray Diffraction (XRD) and FTIR analysis to detect the transition of the materials and the molecular fingerprint.