Some physical, chemical or electrochemical phenomena that cause the decomposition of a material, usually metallic, they can be defined as corrosion. Analyzing the adverse means and determining its characteristics, several efficient methods can be developed to prevent it, consisting in one of them the absorption of the oxidizing agent. This technique is based on significantly reduce the concentration of the compound. As the hydrogen sulfide corrosive substance, its excessive presence in gas streams intensifies the deterioration of equipment during the contact. The objective was to absorb hydrogen sulfide from biogas. The absorption study was conducted by applying a 5% sodium hydroxide solution. The device designed consisted of a cylindrical packing column, bearing a gas inlet and a distributor at the bottom, which further supports the packing, and a liquid inlet and distributor at the top. The treated gas is released from the top of the column, and the liquid is discharged at the bottom, containing hydrogen sulfide absorbed in the form of salts. In the design, the biogas flow was 15m³/h with 3% mole hydrogen sulfide and the tower was package with Rasching rings of 1.5 inches. The calculations performed have enabled the design of an absorption column 0.10 m in diameter and 3.00 m height of the packing, causing a loss in pressure of 0.5 cm water/m column.
This study contributes in the existing literature to use biogas for energy use and to perform an absorption column design to avoid corrosion by hydrogen sulfide gas. The project was developed for application in a unit installed in a farm in the city of Uberaba in Brazil.
Frauches-Santos, C., M.A. Albuquerque, M.C.C. Oliveira and A.A.A. Echevarria, 2014. A Corrosão e os Agentes Anticorrosivos. Revista Virtual de Quimica, 6(2): 293-309.View at Google Scholar
Leite, A.B., S.L. Bertoli and A.A.C. Barros, 2005. Chemical absorption of nitrogen dioxide. Engenharia Sanitária e Ambiental, 10(1): 49-57.
Mamrosh, D., C. Beitler, K. Fisher and S. Stem, 2008. Consider improved scrubbing designs for acid gases: Better application of process chemistry enables efficient sulfur abatement. Hydrocarbon Processing, 87(1). View at Google Scholar
Mccabe, W.L., J.C. Smith and P. Harriot, 2005. Unit operations of chemical engineering. 6th Edn., Boston: McGraw Hill.
Norman, W.S., 1962. Absorption, distillation and cooling towers. London: Longmans.
Sinnott, R.K., J.M. Coulson and J.F. Richardson, 2005. Chemical engineering design. Boston: Butterworth-Heinemann.
This study received no specific financial support.
The authors declare that they have no competing interests.
All authors contributed equally to the conception and design of the study.