Determinación de la cinética para la descomposición catalítica de residuos de plástico de polipropileno.

Abstract

The objective of this research project was to determine the kinetics of the catalytic decomposition of polypropylene residues. To determine the kinetics of the process, a ZSM- 5 catalyst and a catalyst recovered from the oil refinery processes were used, by thermos gravimetric analysis (TGA) under the following operating conditions: a heating rate of 15 ° C min -1, a catalyst concentration of 10% w / w and a particle size of approximately 1mm, considering an inert atmosphere. The results obtained from the kinetics are defined by the Friedman and Flyn - Wall - Ozawa (FWO) models and are adjusted to the kinetics of thermal and catalytic decomposition of the polypropylene residues through TGA studies, with values of the coefficient of determination (R2) 0.9911; 0.9936 and 0.9965 and Activation Energy values of 176.955; 180,771 and 173,555 kJ mol-1 respectively. By comparing the pyrolysis products that were obtained using a Batch type reactor with a heating rate of 15 ° C min -1, an inert atmosphere, a cooling system was obtained the condensable gases and the mass balance to determine the performance of the pyrolytic products, the study carried out showed that the addition of a catalyst in the thermal degradation process reduces the formation of pyrolytic oils, solid residues formed with the deactivated catalyst and products formed from carbon, increasing the generation of the fraction gaseous from 17.23% to 28.24% in the case of the ZSM-5 catalyst and from 17.23% to 24.64% in the case of the recovered catalyst, for which the analysis of non-condensable gases must be carried out to guarantee the product obtained when using a recovered catalyst which improves the performance of the pyrolytic products obtained.