The burning of combustible material that produces emissions released to the atmosphere results in unfavorable climate change due to emissions of CO 2 , NO x , and acid rain by SO x , endangering the health of the population. The treatment of combustion gases by means of a packed absorption column with a high-efficiency liquidgas contactor material reduces pollutant emissions to the atmosphere, where combustion gases make contact with aqueous amine solution of mono ethanol amine (MEA), using different structured packing materials which can be metallic, polymeric, or ceramic. The objective of this work is to study which one of these three types of materials of gas-liquid contactors presents the lowest deterioration in the presence of combustion gases flowing countercurrent to MEA. The materials were evaluated according to the Standard Test Methods ASTM G31-2004 for corrosion testing, ASTM E8-1998 for tension testing, ASTM E384-1990 for microhardness testing, ASTM G5-1999 for potentiodynamic and potentiostatic testing, and the procedure of NRF-194 PEMEX-2007. The properties studied were the tensile strengths, the hardness values, and the elastic moduli, before and after structured packing materials made contact with combustion gases in MEA aqueous solution. The results showed that in acidic and basic mediums, the metallic material was the most resistant to abrasion; it has the highest tensile strength, and presents more resistance during the stress test. The hardness results for the materials were metallic: 190 KH, polymeric: 20 KH, and ceramic: 700KH. The respective corrosion resistances in the presence of MEA were 1.63 9 10 -3 , 3.76 9 10 -3 , and 1.42 9 10 -2 mm/year.

The climate change and its impact to the environment is a topic of general importance which in the last years has raised a growing interest, to such a degree that many groups have been created worldwide to analyze it. The use of structured packing materials in an absorption column for washing sour gases proceeding from brick kilns is a suitable way to determine the material of more mechanical and chemical resistant and efficient in the treatment of these gases. In this work, three materials were characterized, a ceramic, a polymer and a metal by means of hardness test and electron microscopy (morphology). These materials are used as gas-liquid contactors, or packing beds in the absorption column for the sour gases treatment. The hardness results indicated that the ceramic material is the hardest one and therefore the most weak mechanically, the polymeric one is the most ductile, and the mechanical behavior of the metal material is intermediate. This study focuses on the first experimental stage, which is before the contact with the gases and particles from the kilns. The initial properties of the above materials were studied before being introduced the absorption column. The resistance to corrosion or the deposition, from the treatment of the gases in real conditions will be evaluated in a second phase on the research. The hydrodynamic behaviors were determined in the absorption column in order to determine the ideal conditions of operation, usually in the turbulence or load region. It was found that the polymeric material can work with a wide range of liquid load: from 0 to 30.03 m3/m2h, while with the metallic material it is better to work with a liquid load of 27.16 m3/m2h, Also, a standard test of corrosion (TAFEL), was performed using a solution of sulphuric acid 1N.. This was done in agreement to the ASTM G5-1999 standard procedure and the methods ININ No. P, SC (LC)-05. It found that the polymeric material is the most resistance to corrosion.

No abstract

the neutron scattering when concentration levels are to high like those in our case, in order to avoid unnecessary exposition to patients and personnel in general.