采用恒界面池法研究双(2-乙基己基)磷酸酯(HDEHP)-乳酸复合体系萃取镧和铈动力学  

Extraction kinetics of lanthanum and cerium in bis(2-ethylhexyl)phosphate(HDEHP)-lactic acid complex system using Lewis cell

作　　者：宋强[1] 张文杰[1] 童雄[1] 谢贤[1] 蓝卓越[1] 杜云鹏[1] 曹阳 范培强 Qiang SONG;Wen-jie ZHANG;Xiong TONG;Xian XIE;Zhuo-yue LAN;Yun-peng DU;Yang CAO;Pei-qiang FAN(School of Land Resource Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学国土资源工程学院,昆明650093

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第6期1943-1952,共10页中国有色金属学报（英文版）

基　　金：the financial support from the National Natural Science Foundation of China(No.U1802252)。

摘　　要：研究在乳酸络合体系中HDEHP萃取镧和铈的动力学。通过恒界面池装置分别研究不同搅拌速度、比界面积、温度和溶液组分浓度对萃取速率的影响。当搅拌速度为130~180 r/min时,萃取反应速率以化学反应控制为主,并且随着比界面和温度的升高,萃取速率变快。萃取动力学研究表明,萃取反应符合准一级反应,传质过程发生在有机相与液相界面而不是在相体内。萃取反应吉布斯自由能ΔG<0,能够自发进行反应,表观活化能的计算表明HDEHP在萃取中更易与铈结合。The kinetics of the bis(2-ethylhexyl)phosphate(HDEHP)extraction of lanthanum and cerium were investigated in a lactic acid complex system.The effects of stirring speed,specific interface area,temperature and concentration of different solution components on the extraction rate were studied using a constant interface cell device.When the stirring speed was 130−180 r/min,the extraction reaction rate was mainly controlled by the chemical reaction,and increased with increasing the specific interface and temperature.The extraction kinetics shows that the extraction reaction conforms to a pseudo-first-order reaction,and the mass transfer process occurs at the interface between the organic and liquid phases rather than in the bulk phase.The Gibbs free energy of the extraction reactionΔG<0,indicating that the reaction can proceed spontaneously,while the calculation of the apparent activation energy shows that HDEHP is more likely to combine with cerium during extraction.

关 键 词：镧 铈 机理 萃取动力学 恒界面池 

分 类 号：TQ133.3[化学工程—无机化工] TQ028.32