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用恒界面池法研究了伯胺N1923和三苯基氧化膦(TPPO)二元萃取剂体系从盐酸介质中萃取AuCl_4~-的动力学,提出了界面化学反应控制机理。认为在界面区域内同时进行着N1923、TPPO以及二者的缔合物萃取AuCl_4~-的三个平行反应,三者的共同作用使Au(Ⅲ)向有机相的传质较N1923或TPPO的一元萃取剂体系明显加速。文中对这种动力学加速现象和动力学协同效应以及它们与热力学协同萃取的关系进行了讨论。
The kinetics of AuCl_4 ~ - extraction from hydrochloric acid medium with primary amine N1923 and triphenylphosphine oxide (TPPO) binary extraction system was studied by the method of constant interface pool. The control mechanism of interfacial chemical reaction was proposed. It is considered that three parallel reactions of N1923, TPPO and the association of the two with AuCl_4 ~ - are carried out in the interfacial region. The three reactions lead to the mass transfer of Au (Ⅲ) into the organic phase more than that of N1923 or TPPO Extraction system significantly accelerated. In this paper, the kinetic accelerating phenomena and kinetic synergistic effects and their relationship with thermodynamic co-extraction are discussed.