Abstract: A device was designed to measure the solubility of CO2 in the aqueous amine in this research. The following data were obtained，carbon dioxide solubility in 2 mol/L aqueous DEA at 308 K、318 K、328 K、358 K under CO2 partial pressure of 0—150 kPa. Meanwhile，mixtures of additives such as DETA，MDEA，AEE as well as SG and aqueous DEA were compounded and the solubility of CO2 in such mixtures were measured. The molar ratio of DEA and the additive in the mixture was 3∶1 and the total concentration of the amine remained at 2 mol/L. The results showed that elevating the partial pressure of CO2 may contribute to the increase of the solubility in the aqueous DEA，and the temperature played a reverse role. Impacts of different additives on the solubility of CO2 was presented to be DETA > AEE > SG > MDEA.

Key words: aqueous mixtures of DEA, carbon dioxide(CO2), equilibrium solubility

摘要： 设计了测定CO2在溶液中溶解度的实验装置，并对2 mol/L的DEA水溶液分别在温度条件为308 K、318 K、328 K、358 K，CO2分压力范围0～150 kPa时的CO2溶解度进行了测定。并选取MDEA、DETA、AEE和SG作为代表添加物，测定了添加剂与DEA 摩尔比为1∶3、醇胺总浓度为2mol/L的条件下溶液中CO2的溶解度。结果表明，在实验压力范围内，DEA溶液中CO2溶解度随压力增大逐渐增大随温度升高而减小；对DEA溶液中CO2的溶解度影响大小顺序为DETA > AEE > SG > MDEA。

关键词: DEA复配溶液, 二氧化碳, 平衡溶解度