Remoção de enxofre em cargas orgânicas utilizando zeólita beta impregnada com metais de transição (Zn e Ni).

Abstract

The presence of sulfur compounds in petroleum fractions is highly undesirable since they result in corrosion and environmental pollution. The conventional hydrotreating technologies used at present for this purpose involve high costs, complex facilities and uses sophisticated catalysts. Recently, proposals have appeared for the additional removal of sulfur contents in the gasoline through the processes of adsorption. In this work the zeolite Beta was used as adsorbent, impregnated with 0,25; 0,5; 5,0; 7,0% % of zinc and 1,5 % of nickel with the purpose of removing the sulfur of the gasoline. The zeolite Beta was synthesized and characterized through DRX, SEM and TGA. After the synthesis that material was impregnated with zinc and nickel and accomplished the kinetic tests and modeling to coefficient off diffusion in the microporous for the kinetcs of adsorption. The results showed that adsorbent NiBeta-5% adsorb significantly the mercaptan of the synthetic gasoline verifying like this, that that adsorbent is quite promising in the process of adsorption of sulfur of the gasoline. The propesed kinetics model predicts with good agreement in the operational range used is this work.