Corrosion Behavior of Carbon Steel in Alkanolamine/Room-Temperature Ionic Liquid Based CO2 Capture Systems

Ind. Eng. Chem. Res., 2012, 51 (26), pp 8711–8718
Corrosion Behavior of Carbon Steel in Alkanolamine/Room-Temperature Ionic Liquid Based CO2 Capture Systems
Muhammad Hasib-ur-Rahman †, Hana Bouteldja ‡, Pascal Fongarland ‡, Mohamed Siaj §, and Faı̈çal Larachi *†
faical.larachi@gch.ulaval.ca
† Department of Chemical Engineering, Laval University, Québec QC, G1V 0A6, Canada
‡ Ecole Centrale de Lille, Unité de Catalyse et Chimie du Solide, 59655 Villeneuve d’Ascq Cedex, France
§ Department of Chemistry, Université du Québec à Montréal, Montréal QC, H3C 3P8, Canada
Abstract
Alkanolamine/room-temperature ionic liquid (RTIL) systems are being tested as a replacement to address the drawbacks of aqueous alkanolamine based state-of-the-art technology for industrial scale carbon dioxide capture. The new schemes appear to be a better alternative to minimize corrosion.  
Omission of the aqueous phase marks abolition of probable oxidizing species mainly responsible for corrosion in water-based chemical absorption processes.  Authors describe results of a study of the corrosion phenomenon in amine/room-temperature ionic liquid blends comprised of alkanolamine/s (monoethanolamine, 2-amino-2-methyl-1-propanol, diethanolamine, N-methyldiethanolamine) and hydrophilic room-temperature ionic liquid ([BMIM][BF₄], [EMIM][BF₄], and [EMIM][Otf]).  Researchers probe the effect of amine/RTIL type, process temperature, CO₂ loading, presence/absence of oxygen in flue gas, as well as the influence of water content.
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