Abstract Thermal stability and corrosion of seven tertiary amines (20 wt.%) solutions in water and water-glycol [ethylene glycol (MEG)/tri-ethylene glycol (TEG)] loaded with CO2 in stainless steel reactors has been studied for combined acid gas removal along with hydrate control. The pKa of the tested amines varied from 7.85 to 9.75. Titration and inductivity coupled plasma mass spectrometry (ICP-MS) are used to quantify the remaining alkalinity and metal concentrations in amine solutions respectively. The presence of MEG and TEG profoundly influenced the amine stability. Triethanolamine had the highest thermal stability. Furthermore, the results also show that an increase in pKa generally decreases corrosion. 3-(Diethylamino)-1,2-propanediol (DEA-1,2-PD) has the lowest corrosion in water and water-TEG solutions while 2-(Diethylamino)ethanol (DEEA) has the least corrosion in water-MEG solutions.

中文翻译：

---

用于联合去除酸性气体和水的胺水溶液和胺-乙二醇-水溶液中叔胺的热稳定性和腐蚀

摘要 在不锈钢反应器中研究了七种叔胺 (20 wt.%) 水溶液和水 - 乙二醇 [乙二醇 (MEG)/三乙二醇 (TEG)] 溶液在不锈钢反应器中的热稳定性和腐蚀。气体去除和水合物控制。被测胺的 pKa 在 7.85 到 9.75 之间变化。滴定和电感耦合等离子体质谱 (ICP-MS) 分别用于量化胺溶液中的剩余碱度和金属浓度。MEG 和 TEG 的存在极大地影响了胺的稳定性。三乙醇胺具有最高的热稳定性。此外，结果还表明，pKa 的增加通常会减少腐蚀。3-(二乙氨基)-1,2-丙二醇 (DEA-1,