Avaliação do uso de carvão ativado na remoção de compostos nitrogenados básicos em diferentes derivados do petróleo
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2020-02-28
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Universidade Federal de Goiás
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In the reserves of heavier oils, high concentrations of nitrogenous compounds found, which, in
general, cause problems for the refining process and for the environment. The removal of these
compounds through an adsorptive process, later associated with the traditional
hydrodesnitrogenation process, is a promising and favorable technique, especially from an
economic and operational point of view. In this context, this research sought to study the
denitrogenation of oil samples, through an adsorptive process in a batch system, using chemically
treated acid activated carbon. Initially, the solution of indoline in toluene was used as a synthetic
filler and different activated carbons were evaluated for the ability to remove the compound. From
the preliminary test, the use of activated carbon from coconut shell treated with sulfuric acid
(CDAS), resulted in the removal of 97.95% of the indoline present in the solution, and was
selected for kinetic and equilibrium study. The adsorption kinetics revealed a relatively fast process
for the different concentrations studied. The kinetic data were better adjusted to the pseudo-second
order model and the balance data were better adjusted to the Freundlich model. Competitive
adsorption tests were also carried out between two nitrogenous, quinoline and indoline, with
greater removal amounts being observed in solutions with a higher proportion of indoline.
Subsequently, the study of adsorption of basic nitrogenous compounds in a crude oil sample was
carried out using the central composite planning technique and response surface methodology. The
analysis of the main effects showed that the most significant in the adsorption process was the
mass of adsorbent. With the optimized variables (54oC, 150 rpm and 1.104g), a removal of 30.77%
of basic nitrogenous compounds in oil was obtained. With the optimal conditions, adsorption tests
were performed using vacuum residue, diesel S-10 and diesel S-500, in which the removals
obtained were 21.56%, 44.44% and 62.09% respectively. Finally, the analysis of mass
spectrometry and thermogravimetry proved qualitatively that the adsorption of nitrogen
compounds present in the samples occurred.
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CARVALHO, M. A. F. Avaliação do uso de carvão ativado na remoção de compostos nitrogenados básicos em diferentes derivados do petróleo. 2020. 57 f. Dissertação (Mestrado em Engenharia Química) - Universidade Federal de Goiás, Goiânia, 2020.