(中國科學(xué)院上海有機化學(xué)研究所， 上海 200032)
摘 要: 用線性回歸分析方法探討了各種類型和結(jié)構(gòu)的酸性磷型萃取劑從硫酸鹽溶液中萃取Co(Ⅱ)和Ni(Ⅱ)的表觀萃取平衡常數(shù)對數(shù)lgKex與萃取劑分子中取代基的電子效應(yīng)參數(shù)ΣσΦ和空間效應(yīng)參數(shù)Συ之間的相關(guān)關(guān)系。 結(jié)果證實， 其關(guān)系符合線性自由能關(guān)系式。 應(yīng)用這一關(guān)系式可以初步預(yù)測這類萃取劑萃取Co與Ni的lgKex及其分離因數(shù)β(Co/Ni)。 這對設(shè)計新的高效Co-Ni分離萃取劑有一定的指導(dǎo)意義。
關(guān)鍵字: 酸性磷型萃取劑 Co(Ⅱ) Ni(Ⅱ) 線性自由能關(guān)系
（Shanghai Institute of Organic Chemistry,Chinese Academy of Sciences, Shanghai 200032, P. R. China
）
Abstract:The correlation relationships between the logarithm of apparent extraction equilibrium constants lgKex and the electronic effect parameter ΣσΦ as well as the steric effect parameter Συ of the substituents in extractant molecules were examined by linear regression analysis method in the extraction of Co(Ⅱ)and Ni(Ⅱ) from sulfate solutions by various kinds and structures of acidic organophosphorus extractants. The results indicated that the correlation relation coincides with the linear free energy relationship (LFER). This relationship can be applied to predict the lgKex of Co or Ni and their separation factor β(Co/Ni) with this kind of extractants, and thus possesses some directive sense for the design of new highly effective Co-Ni separation extractants.
Key words: acidic organophosphorus extractant Co(Ⅱ) Ni(Ⅱ) linear free energy relationship (LFER)
