Remoção de enxofre na mistura ciclohexeno-propanotiol através de processos de adsorção sobre AIPO e MeAPOs.

Abstract

Researches in removal sulfur in fuels were developed in the last years due to the demand for a larger control in emission of automobiles pollutant. With this purpose, it is looked for develop methodologies to prepare and to characterize new adsorbents with high capacity on sulfur removal in fuels. Recent works were proposed to additional sulfur removal in gasoline through adsorption processes. Such processes are less complex and are based in the principle that specific adsorbents are capable of selectively capture sulfur compound present in the effluents of desuiphurization systems. Aluminum oxides and phosphor, with similar structure of the zeolites, called AIPO, were proposed for the sulfur compounds adsorption. In the present work AIPO VFI was synthesized and Impregnations of AIPO with metals (zinc and nickel) form the resulting MeAPOs. By chemical analyses it was proved that the MeAPOs had the expected metal content. The thermo gravimetric analysis showed that the template was removed during crystallization and washing. The performance of AIPO and MeAPOs as sulfur compounds adsorbents was verified by means of kinetic studies, using the mixture (cyclohexene/propanetiol). The kinetic study showed that both materials got to reduce sulfur concentration and MeAPO Zn 7.5% obtained the best result. The effective diffusion coefficients of propanetiol in ALPO and MeAPOs were estimated by adjusting the experimental data to the finite volume Fick's 2n d law solution. The modeling of kinetic data of propanetiol adsorption was shown satisfactory with standard deviation less than 0.36. The diffusion coefficients ranged from 0.9 to 3.8 x 10"u m/s.