The synergetic effect on oxidative degradation inhibition of 1-amino-2-propanol for post-combustion CO2 capture

Amine degradation is one of the key issues that hampers the implementation of large-scale carbon capture technology. Degradation inhibitors can extend the lifetime of amine solutions, thereby lowering the operating cost of CO 2 capture system in the long term. In this work, different inhibitors including chelating agents, scavengers, and their blends were studied to inhibit the oxidative degradation of 1-amino-2-propanol (1AP). Amine loss, alkalinity loss, NH 3 emissions and heat-stable salt production were measured to evaluate the inhibitory effect. The parameter, namely inhibition factor, was proposed to quantify the effect of inhibitors. Two chelating agents were found to show good inhibitory effects on 1AP degradation, with inhibition factors of 7.1 and 4.3, respectively. In addition, the inhibition factor was increased to 9.4 by blending the inhibitors. A significant reduction in the inhibitor dosage was applied to achieve a similar inhibiting effect due to the excellent synergistic effects between the blended inhibitors.