摘要
用平衡法研究了伯胺 N1923的正辛烷溶液从氯化物介质中苹取铼(Ⅶ),其反应方程式为RNH_3Cl_((0))+ReO_4^-RNH_3ReO_4_((0))+Cl^-求得 Kex=10^(1.08)。运用 ReO_4^-离子选择电极作检测手段,用恒界面搅拌法研究了该苹取体系的动力学。结果表明,苹取反应机理是两步界面反应RNH_3Cl_(i)+ReO_4^-RNH_3ReO_(4(i))+Cl^-RNH_3ReO_(4(i))+RNH_3Cl_((0))RNH_3ReO_(4(0))+RNH_3Cl_((i))用计算机模拟方法求出了各 k 值。
The extraction equillibrium and kinetics of Re(Ⅶ)from chloride med- ium with primary amine N1923 have been studied.The equillibrium results show that the extraction reaction is ReO_4^-+RNH_3Cl_((0))RNH_3ReO_4_((0))+Cl^- The kinetics results obtained by means of PVC-membrane ReO_4^- ion selective electrode and stationary interface stirred cell suggest that the extraction mechanisms may be as follows: ReO_4^-+RNH_3Cl_((i))RNH_3ReO_(4(i))+Cl^- RNH_3ReO_(4(i))+RNH_3Cl_((o))RNH_3ReO_(4(o))+RNH_3Cl_((i)) where,(i) and (o) represent the interface and the organic phase,respectiv- ely.By applying the steady state approximation,we obtain k_f=(k_1k_2c_((i))c)/(k_(-1)c_(Cl^-)+k_1c),k_b=(k_(-1)k_(-2)c_((i))c)/(k_(-1)c_(Cl^-)+k_2c) where,C represents the concentration of N1923.The values of k_1c_((i)),k_2/k_(-1) and k_(-2)c_((i)) were calculated by computer.The sharply changes of the kinetics results near the c_(min) suport the above mechanisms.
出处
《山东大学学报（自然科学版）》
CSCD
1990年第3期342-348,共7页
Journal of Shandong University(Natural Science Edition)
关键词
铼
伯胺
萃取动力学
萃取
Rhenium
extraction kinetic
primary amine N1923
