【摘要】 本文研究了甲基膦酸二甲庚酯(P₃₅₀,以 B 表示)与伯胺 N₁₉₂₃（以RNH₂表示）的正庚烷溶液,在（Na,H）C1介质中对 Cd（Ⅱ）的协同萃取。用等摩尔系列法和斜率法确定二元协萃配合物组成为（RNH₃C1）₂·CdC1₂·B;求得协萃反应平衡常数1gK_Bc=2.08,协萃配合物的生成常数1gβ=0.70;计算了协萃反应的热力学函数△H=-14.56kJ/mol,△G=-12.07kJ/mol 和△S=-8.22J/mol·K;还讨论了协萃配合物的 IR 和NMR 谱。更多还原

【Abstract】 The synergistic extraction of Cd（Ⅱ）from（Na,H）Cl solutions withdi（l-methyl-heptyl）methyl phosphonate i.e.P₃₅₀（B）and primary amineN-1923（RNH₂）in n-heptane was studied at 30℃.The composition of thesynergistic extraction complex was determined to be（RNH₃Cl）₂·CdCl₂·Bby the usual methods of slop and constant mole.Synergistic extractionreaction and complex formation reaction were proposed as follows:CdCl₂+2/3（RNH₃Cl）_3（0）+B_o（?）（RNH₃Cl）₂·CdCl₂·B_o（RNH₃Cl）₃·CdCl_2（o）（?）（RNH₃Cl）₂·CdCl₂·B_o+1/3（RNH₃Cl）_3（o）（Cont.on p.66） （Cont.from p.64）Their equilibrium constants and thermodynamic functions were calculated(logK_BC=2.08;logβ=0.70;△H=—14.56 kJ/mol;△G=—12.07 kJ/mol;△S=—8.22J/mol·K).The IR and NMR spectra of the synergistic extractioncomplex of Cd（Ⅱ）were studied as well,更多还原