摘要
在２９８±１Ｋ下用生长液滴法研究了（２，４，４－三甲基戊基）次膦酸（ＣＹＡＮＥＸ２７２，ＨＡ）－煤油溶液从硫酸介质中萃取Ｃｏ（Ⅱ）的动力学，提出发生在界面区的两步反应为萃取过程速率控制步骤，即：Ｃｏ２＋＋２ＨＡ（ｉ）ＣｏＡ２（ｉ）十２Ｈ＋ＣｏＡ２（ｉ）＋２Ｈ２Ａ２（ｏ）ＣｏＡ２·２ＨＡ（ｏ）＋２ＨＡ（ｉ）（ｏ）、（ｉ）分别标记有机相和界面区物种．经测定，正向反应活化能为３３．７ｋＪ·ｍｏｌ－１，萃取平衡的焓变为４２．
The kinetics of the extraction of cobalt (Ⅱ) using purified di (2, 4, 4-trimethyl pentyl)phosphinic acid was investigated by means of the Growing Drop Methed. The effects ofcobalt concentration,pH and temperature conditions were observed. The kinetic data weretreated according to inter facial chemical reaction models as follows:The forward and back initial extraction rate equations are:where K1=K1(CHA(i) )2 ; K-2=K-2(CHA(i) )2,S and V are the surface area and the volume ofthe drop of the organic phase,respectively.The values of activation energy of the forward and back extraction reactions were calculated to be 33. 7kJ.mol-l and-8.4 kJ. mol-1,respectively.
出处
《山东大学学报（理学版）》
CAS
CSCD
1994年第3期320-325,共6页
Journal of Shandong University(Natural Science)
基金
国家自然科学基金
