Chemical absorption of H2S for biogas purification
AUTOR(ES)
Horikawa, M.S., Rossi, F., Gimenes, M.L., Costa, C.M.M., Silva, M.G.C. da
FONTE
Brazilian Journal of Chemical Engineering
DATA DE PUBLICAÇÃO
2004-09
RESUMO
This work presents an experimental study of purification of a biogas by removal of its hydrogen sulphide (H2S) content. The H2S was removed by means of chemical absorption in an iron-chelated solution catalyzed by Fe/EDTA, which converts H2S into elemental sulphur (S). Preparation of the catalyst solution and the results of biogas component absorption in the catalyst solution (0.2 mol/L) are presented. These results are compared with those for physical absorption into pure water under similar conditions. Experimental results demonstrate that, under the same experimental conditions, a higher percentage of H2S can be removed in the catalytic solution than in water. In a continuous counter current using adequate flow-rate phases contact at room temperature and low gas pressure, the results demonstrate that is possible to totally remove the H2S from the biogas with the prepared catalytic solution.
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