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本文研究了酸性介质中含三正辛胺(TOA)第三液相(简称第三相)的形成及组成。第三相成相过程中,TOA首先质子化,然后与阴离子缔合,形成TOA:H~+摩尔比为1:1的缔合物,即TOA·HA。由于TOA·HA难溶于稀释剂(石油醚),故析出产生第三相。实验条件下,水溶液中初始HC1O_4浓度大于0.002mol/L产生第三相;HC1O_4浓度大于0.08mol/L时,大约95％的TOA进入微小体积的TOA·HC1O_4第三相。实验了酸度及盐析剂浓度对形成第三相的影响。探讨了TOA·HA第三相的萃取机理。
In this paper, the formation and composition of the third liquid phase (referred to as the third phase) of tri-n-octylamine (TOA) in acidic medium were studied. In the third phase, TOA is first protonated, and then associates with anion to form TOA: H ~ + molar ratio of 1: 1 associate, namely TOA · HA. Since TOA · HA is poorly soluble in diluent (petroleum ether), the third phase is precipitated. Under the experimental conditions, the initial concentration of HC1O4 in aqueous solution is greater than 0.002mol / L to produce the third phase. When HC1O4 concentration is greater than 0.08mol / L, about 95% of TOA enters the third phase of small volume of TOA HC1O4. The effects of acidity and salting-out concentration on the formation of the third phase were investigated. The extraction mechanism of the third phase of TOA · HA was discussed.