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Xiao, Dan
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document
Hydrothermal Corrosion of Carbon Steel in CO2 Loaded Diamine Solvents
Abstract
Corrosion is a crucial issue in CO2 capture process using aqueous amine absorbents at industrial scales. Molecular structure of the chemical absorbent plays a key role in the performance of amines in the CO2 capture process which extends to the corrosion behaviour of CO2 rich amine absorbents to steel present in the processes. The present study investigates the corrosion behaviour of carbon steel in CO2-loaded 4-amino-1-propyl-piperidine (4A1PPD) and a series of related diamine solutions via hydrothermal corrosion experiments. MEA solutions with the same total amino concentration were studied in parallel under the same experimental conditions as a benchmark for comparison.The results here showed that increasing the carbon chain length between the two amino groups in the di-amine molecules, increased number of substituents on amino groups, and a structural change from the linear to cyclic structure improved the performance of the absorbents towards the corrosion of carbon steels. The designer amine, 4A1PPD, comprising a 3 carbon chain distance between the two amino groups and cyclic moiety in the molecule resulted in a dense passivation film of FeCO3 forming on the carbon steel surface after hydrothermal corrosion treatment with a CO2 rich 4A1PPD solution. The results also suggest that higher bicarbonate/carbamate ratios are somewhat beneficial to the formation of the passivation film on the surface of the carbon steel. This study reveals that structural features, such as the increase of the carbon chain length (C2 to C3), and substituents on nitrogen and cyclic moieties improve the corrosion behaviour of the CO2 rich amine absorbents. Encouragingly, all the beneficial structural features which act to reduce the corrosion of CO2 loaded amines on carbon steel are similar features which have been found to deliver improved energy performance in CO2 capture.