Abstract—This report demonstrates the application of the membrane contactor for carbon dioxide removal. The investigations were performed with the use of a single polypropylene capillary membrane. Two primary amines (monoethanolamine MEA, diglycolamine DGA), one secondary amine (diethanolamine DEA), one tertiary amine (methyldiethanolamine MDEA) were used to prepare absorbate solutions. Batch experiments were conducted for the counter-current flow with liquid on the tube side of the module. The system was investigated for aqueous solutions of amines and for the solutions with piperazine addition. The absorption kinetics with the use of primary amines appeared to be much faster than those of secondary and tertiary amines. The amine efficiency can be stated as follows: MEA>DGA>DEA>MDEA. Further investigations have shown/show that the presence of an activator improves the reaction and process kinetics and brings the DEA and MDEA efficiency to the level of primary amines. The influence of different types of amine solutions used as liquid absorbents on the stability of the membrane shows that these solutions do not wet PP (polypropylene) membranes even after 150 days’ immersion in different absorbents.
Index Terms—Amines, carbon dioxide, membraneabsorption, membrane contactors.
The authors are with the Wroclaw University of Technology, 50-373, Wroclaw, Poland (e-mail: anna.witek@pwr.wroc.pl,anna.dawiec@pwr.wroc.pl, szymon.modelski@pwr.wroc.pl,daria.podstawczyk@pwr.wroc.pl).
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Cite: Anna Witek-Krowiak, Anna Dawiec, Szymon Modelski, and Daria Podstawczyk, "Carbon Dioxide Removal in a Membrane Contactor – Selection of Absorptive Liquid/Membrane System," International Journal of Chemical Engineering and Applications vol. 3, no. 6, pp. 391-395, 2012.
