Co-pirólise catalítica da borra oleosa de petróleo com poliolefinas: aumento de mesoporos em zeólitas Y para tratamento de resíduos e obtenção de produtos parafínicos

Abstract

Oil sludge, a residue of the petroleum industry, was pyrolized at 450 ° C in the presence of three zeolitic catalysts (CBV-720, CBV-760 and CBV-780). The catalysts were initially chosen to obtain paraffin-rich oil based on different Silica / Alumina (SAR) ratios, similar textural characteristics and presence of mesopores. Pyrolytic oil was analyzed by GC-MS and the effect of different catalysts on the composition of the oily product was analyzed in light of their acid and textural characteristics. The products obtained in the presence of mesoporous zeolites with lower acidity than conventional literature zeolites showed selectivity for the conversion of light hydrocarbons. The chemical profile of these products encouraged the process of co-pyrolysis of oil sludge with the main polyolefins found in urban solid waste (HDPE, LDPE and PP). The results revealed that the oil oily sludge favors the cracking of the polymers and the composition of the pyrolytic oil is directly related to the polymeric structure, besides revealing that of the three zeolites tested, the one with the highest acidity allowed to obtain the best results. The catalyst that presented the best performance in co-pyrolysis was submitted to desilication and dealumination treatments, trying to obtain mesopores on its surface, as well as altering its acid force. The pyrolytic oil obtained with the modified catalysts was analyzed by GC-SimDis ASTM 2887 method and compared with diesel oil standard. It was revealed that from the modifications made, the Mod-10 (desilication) and Mod-Al (dealumination) catalysts showed similar acidic and textural properties and both catalytic conversions allowed to obtain paraffin-rich linear carbon chain oil in the diesel fraction range, revealing a product with potential fuel value.