Uso de catalizadores en base de zeolita para el mejoramiento de las propiedades fisicoquímicas de los productos de pirólisis de una mezcla de polietileno de alta densidad (HDPE) y polipropileno (PP)

Abstract

Over the last few years, the increase in the production of plastics has been very evident; one of the valuable ways of using it is pyrolysis. Thus, this research sought to evaluate the use of ZSM- 5 zeolite-based catalysts, monometallic (Ni) and bimetallic (Ni-Zn), in the improvement of the physicochemical properties of a mixture of high-density polyethylene and polypropylene. A batch-type reactor was used, where a tubular reactor was adopted in which the catalyst was placed; it was activated for 30 minutes at a temperature of 300 C to react with the gases produced from the batch reactor connected to a constant flow of hydrogen gas, it heated to 425 C at which the reaction took place, generating gases and these passing through the tubular reactor that was kept at an At a temperature of 250 C throughout the process, for 1 kg of the plastic waste mixture, use 2 g of catalyst, divided into two equal portions: 50% HDPE and 50% PP, obtaining a liquid and solid fraction. The liquid fraction underwent GS-MS chromatography, API grades, ASTM-D86 distillation, viscosity, and flash point analysis. At the same time, the substantial fraction is the FTIR analysis. The results used a standard to compare the results. It evidences that the use of catalysts considerably increases the yield of the production of the liquid fraction, improving the physicochemical properties by expanding the API grade, in addition to a high proliferation of compounds such as olefins with a metal nome catalyst and paraffins with bimetallic, with a low percentage of aromatic compounds in both catalysts.