Water-lean amine are promising solvent for CO₂ capture to significantly reduce regeneration energy. However, existing water-lean solvent hasn’t been put into commercial application due to high reaction heat, slow CO₂ absorption rate, and high amine volatility of amine. In this paper, amines with one secondary amino (—NH), one hydroxyl (—OH), and carbon chain length between 3 and 6 (C₃-C₆) in structure were preferred for water-lean solvent in the light of amine structure–activity relationship. 2-(ethylamino) ethanol (EMEA) dissolving into 1-methyl-2-pyrrolidinone (NMP) and water were favorable water-lean solvent for CO₂ capture, and EMEA/NMP was tested in a bench-scale platform. EMEA/NMP solvents have equivalent CO₂ removal efficiencies, and 40–69% lower regeneration energy compared to blended amines and MEA solvents. The lower regeneration energy of EMEA/NMP results from lower water vapor ratio, lower reaction heat, and lower heat capacity. Viscosity of EMEA/NMP at rich loading is 6.92–11.11 mPa·s at 40℃. Increased stripper temperature increases CO₂ removal efficiency by decreasing lean loading in EMEA/NMP solvents. CO₂ desorption dominates mass transfer in stripper at low temperature while water evaporation dominates at high temperature. The lowest regeneration energy obtained with 5.0 M EMEA/NMP at liquid/gas ratio of 10.5 L/m³ and stripper temperature of 80℃ was 0.99 kWh/kg CO₂ (equivalent to 3.6 GJ/tCO₂), which is 69% lower than that of 5 M MEA. EMEA/NMP has an increasing amine emission from 109 to 1891 mg/m³ as absorber temperature increases from 34℃ to 54℃. Advanced processes would be employed for volatile amine emission control in future study.

贫水胺是用于捕获 CO ₂以显着降低再生能量的有前途的溶剂。_{然而，现有的贫水溶剂由于反应热高、CO 2}吸收速率慢、胺的胺挥发性大等问题，一直没有投入商业化应用。本文从胺的角度出发，优选具有一个仲氨基（—NH）、一个羟基（—OH）、碳链长度在3~6（C 3 _-C 6 _）之间的胺类作为贫水溶剂。构效关系。溶解在 1-甲基-2-吡咯烷酮 (NMP) 和水中的 2-(乙基氨基) 乙醇 (EMEA) 是对 CO 2 有利的贫水_溶剂捕获，EMEA/NMP 在实验室规模平台上进行了测试。与混合胺和 MEA 溶剂相比，EMEA/NMP 溶剂具有同等的 CO _{2去除效率，再生能量低 40–69%。}EMEA/NMP 的较低再生能量源于较低的水蒸气比、较低的反应热和较低的热容量。40℃时，EMEA/NMP 在富负载时的粘度为 6.92–11.11 mPa·s。通过降低 EMEA/NMP 溶剂中的稀薄负载，提高汽提塔温度可提高 CO _{2去除效率。}CO ₂解吸在低温下主导汽提器中的传质，而在高温下水蒸发主导。^{5.0 M EMEA/NMP 在液/气比为 10.5 L/m 3}时获得的最低再生能量80℃汽提塔温度为0.99 kWh/kg CO ₂（相当于3.6 GJ/tCO ₂），比5 M MEA降低69%。随着吸收器温度从 34℃ 增加到 54℃，EMEA/NMP 的胺排放量从 109 增加到 1891 mg/m ^{3 。}在未来的研究中，将采用先进的工艺来控制挥发性胺的排放。