There is about 10 vol% water vapor in coal-fired flue gas, and the existence of water has an effect on the phase separation performance of amine-alcohol two-phase absorbent. The effects of a small amount of water on the phase separation performance and mechanism of TEPA-ethanol-CO₂ system in the range of 0.2 ~ 2.3M TEPA concentration were investigated. The influences of amine concentration and water content on the absorption rate, absorption loading, absorption capacity, mass fraction of CO₂-rich phase and the proportion of CO₂ enriched in the CO₂-rich phase to total CO₂ enriched were studied. The different mechanisms between amine-alcohol-H₂O-CO₂ system and amine-H₂O-CO₂ or amine-alcohol-CO₂ system were discussed. Fourier transform infrared spectroscopy (FTIR) analyses show that the 1308 cm⁻¹ absorption peak attributes to the superposition of angular vibration frequency of -CH₂ and alkylcarbonate. The 1.6M-TEPA-ethanol-14%-H₂O system shows the best comprehensive performance, 96.23 vol% CO₂ is enriched in the CO₂-rich phase, and the average CO₂ absorption rate within the first 30 minutes is 2.4 times faster than 0.2M-TEPA-ethanol-14 %-H₂O solution. The main products in CO₂-rich phase of 1.6M-TEPA-ethanol-14%-H₂O system are carbamate, protonated amine and a little alkylcarbonate. In FTIR spectrum, some unreacted ethanol is also found.

燃煤烟气中约有10vol%的水蒸气，水的存在对胺-醇两相吸收剂的相分离性能有影响。研究了在0.2～2.3M TEPA浓度范围内少量水对TEPA-乙醇-CO ₂体系相分离性能的影响及机理。胺浓度和吸收率的水含量，吸收负载，吸收能力，CO的质量分数的影响₂富含相和CO的比例₂在富CO ₂富含相对于总CO ₂富集的进行了研究。胺-醇-H ₂ O-CO ₂的不同机理系统和胺-H ₂ O-CO ₂或胺-醇-CO ₂系统进行了讨论。傅里叶变换红外光谱(FTIR) 分析表明1308 cm ^-1吸收峰归因于-CH ₂和碳酸烷基酯的角振动频率的叠加。1.6M-TEPA-乙醇-14%-H ₂ O体系综合性能最佳，富CO ₂相富集96.23 vol% CO ₂，前30分钟平均CO ₂吸收率为2.4比 0.2M-TEPA-乙醇-14 %-H ₂ O 溶液快数倍。CO ₂主要产品1.6M-TEPA-乙醇-14%-H ₂ O体系的富相为氨基甲酸酯、质子化胺和少量烷基碳酸酯。在 FTIR 光谱中，也发现了一些未反应的乙醇。