Abstract
Amines were oxidatively degraded in various cycling systems that closely resembled a real CO2 capture plant. 2- amino-2-methyl-propanol (AMP) showed the best resistance to oxidation. Piperazine (PZ) and 2-methyl-piperazine (2MPZ) showed better resistance to oxidation compared with monoethanolamine (MEA), N-methyl-diethanolamine (MDEA), and MDEA/PZ. At higher temperature the overall degradation rate may be significantly higher than would be expected from thermal degradation or oxidation alone. Oxidation at high temperature was not limited by dissolved oxygen and continued to increase above 150°C long after all dissolved oxygen was consumed. Dissolved metal ions from corrosion of stainless steel contributed to greater rates of MEA and PZ oxidation in cycling systems; corrosion was substantially faster in the absence of oxygen. Chelating agents hydroxyethylidene diphosphonic acid (HEDP) and diethylenetriamine penta(acetic acid) (DTPA) reduced but did not eliminate oxidation in 7 m MEA in cycling systems. No other additives were found to inhibit MEA or PZ oxidation in cycling systems.
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