以三辛胺为萃取剂，分别用正辛醇、二氯甲烷、乙酸乙酯、4-甲基-2-戊酮、正己烷、环己烷为稀释剂对3-羟基丙酸稀溶液进行络合萃取，分析了稀释剂对萃取的影响，讨论了温度、溶液pH、相比及络合剂体积分数对络合萃取相平衡分配系数的影响，利用傅立叶红外光谱仪测定了负载有机相中萃合物的结构，对三辛胺络合萃取3-羟基丙酸的机理进行了探讨. 结果表明，正辛醇作稀释剂萃取效果最好，平衡分配系数高达4.46. 以NaOH溶液进行反萃，3-羟基丙酸的反萃率为99.6%.
Tri-n-octylamine (TOA) was employed as extractant, and n-octanol, dichloromethane, ethyl acetate, methyl-iso-butyl ketone (MIBK), n-hexane and cyclohexane were used as diluents for the extraction of 3-hydroxypropionic acid (3-HP) from its dilute aqueous solution. The effects of diluents on extraction was explained. The influences of temperature, aqueous pH, phase ratio and volume fraction of TOA on the equilibrium distribution coefficient were investigated. The structure of organic phase loaded with 3-HP was studied by IR spectrometer and the mechanism of complexation extraction was explored and proposed. The results showed that n-octanol exhibited best extractability among the tested diluents, with a distribution coefficient of 4.46. Backward extraction was performed with sodium hydroxide aqueous solutions, and a backward extraction rate of 99.6% was obtained.
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