This work aims to predict solvent degradation rates in absorption-based CO₂ capture processes using a 30 wt% aqueous monoethanolamine (MEA) solvent. A degradation model for MEA is developed and used to predict solvent degradation in full-scale capture processes. Mass transfer resistances and the solubility of O₂ are considered to obtain a generalized and consistent degradation model. Degradation is evaluated for the capture process for flue gases with typical industrial compositions; a natural gas-fired power plant, a waste-to-energy plant, a coal-fired– power plant, and a cement plant. The impact of process modifications, such as absorber intercooling, dissolved O₂ removal, a reduction in solvent residence times, and increased stripper pressures on degradation is evaluated.

The predicted degradation rate in the capture processes is approximately 90 to 150 g MEA/ton CO₂ captured, and the composition of the flue gas was found to have a significant influence on the distribution of degradation throughout the process. Modifications to the process can significantly affect the overall degradation rate. Both absorber intercooling and removal of dissolved O₂ may reduce the overall degradation by up to 40%, depending on the composition of the flue gas. A reduction in solvent residence times or pressure in the stripper has limited effects on the degradation in the case of MEA, because of the amine’s relatively low stability towards oxidative degradation. However, these process modifications look promising for more stable solvents.

这项工作旨在使用 30 wt% 水性单乙醇胺 (MEA) 溶剂预测基于吸收的 CO _{2捕获过程中的溶剂降解率。}开发了 MEA 的降解模型并用于预测全面捕获过程中的溶剂降解。考虑传质阻力和O _{2的溶解度以获得广义和一致的降解模型。}对具有典型工业成分的烟气的捕获过程进行降解评估；天然气发电厂、垃圾焚烧发电厂、燃煤发电厂和水泥厂。工艺改造的影响，例如吸收器中间冷却、溶解的 O ₂去除、减少溶剂停留时间和增加汽提压力对降解的影响进行了评估。

捕获过程中预测的降解速率约为 90 至 150 g MEA/捕获的每吨 CO ₂，​​并且发现烟道气的组成对整个过程中的降解分布具有显着影响。对过程的修改会显着影响整体降解率。吸收器中间冷却和溶解 O ₂的去除都可以将总降解减少多达 40%，具体取决于烟道气的成分。在 MEA 的情况下，溶剂停留时间或汽提塔中压力的减少对降解的影响有限，因为胺对氧化降解的稳定性相对较低。然而，这些工艺改进看起来有望获得更稳定的溶剂。