Abstract
The oxidative loss of aqueous amines is a significant operating expense for the post-combustion capture (PCC) of CO2 from fossil fuel-fired power stations. A distinctive UV chromophore present in the MEA oxidation product, 2-(hydroxyethyl)imidazole (HEI), has excellent potential for on-line monitoring the oxidation of alkanolamines such as MEA (monoethanolamine). The characteristic ring structure present in this molecule (and its analogues) is responsible for the UV chromophore. Previous work has readily measured HEI absorbance in degraded alkanolamines from Australian PCC pilot plants. HEI absorbance correlates strongly with the traditional more difficult indicator of amine oxidation, i.e. heat-stable salt (HSS) concentration. This study aims to confirm the theoretical basis for the use of HEI (and its analogues) as indicators of MEA (and other alkanolamine) oxidation.
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