ELM法提取磷酸中La^(3+)的相界面反应-传质机理研究  

Study on the Phase Interfacial Reactions-Transport Mechanism in the Process of Leaching La^(3+) from Phosphoric Acid by Emulsion Liquid Membrane

作　　者：王进[1] 党亚固[1] 费德君[1] 范文娟[1] 王永法[1] 

机构地区：[1]四川大学化工学院,四川成都610065

出　　处：《高校化学工程学报》2012年第2期349-352,共4页Journal of Chemical Engineering of Chinese Universities

基　　金：高纯磷酸制备关键技术研究(2007BAC58B01)

摘　　要：在以(D2EHPA+TOPO)/ROSO3H/液体石蜡/煤油为膜相,HCl为内相,磷酸中La3+为外相的乳化液膜(ELM)体系中研究了不同相比A/O、膜相D2EHPA(H2A2)、TOPO、ROSO3H浓度、料液相H3PO4、H2PO4和H+浓度和内相HCl浓度对总分配比DT的影响。实验结果表明:随A/O的增加,DT显著下降;随膜相H2A2、TOPO、ROSO3H浓度的增加,DT先增加后基本不变;但料液相H3PO4和H+浓度的增加使DT降低,DT随H2PO4浓度增加而升高;DT随內相HCl浓度的增加而升高。通过斜率法对ELM各组分H2A2、TOPO、ROSO3H、H2PO4、H3PO4、H+的logc-logDT的线性拟合直线的斜率确定了其参与的摩尔数,得到了该ELM体系的相界面反应-传质机理,并计算出萃取、反萃反应平衡常数k1、k2分别为107.7237、104.8025。An emulsion liquid membrane （ELM） system, in which （D2EHPA＋TOPO）/ROSO3H/liquid paraffin/kerosene acts as membrane, HCI as stripping phase, and La3＋ in H3PO4 as feed phase, was used to study the effects of the phase ratio （A/O =7, 6, 5, 4, 3,2）, concentration of membrane compositions （H2A2, TOPO, ROSO3H）, and concentration of feed phases （H2PO4-, H3PO4, H＋） on the total distribution ratio DT. The results show that the DT decreases with the increase of A/O ratio, and the high concentrations of H2A2, TOPO, ROSO3H in membrane. H2PO4- in feed solution and HCI in stripping phase are beneficial to the increase Of DT, while increasing the concentrations of H3PO4, and H＋ in feed phase will make DT decrease. The molar number of each components （H2A2, TOPO, ROSO3H, H2PO4-, H3PO4, H＋） taking part in feed-membrane-stripping phase reactions and the interfacial reaction-mass transport mechanism in this ELM system were determined by the slope of the loge-log DT curves, and the reaction equilibrium constant values k1 and k2 of 1 07.7237 and 1 0^48025 in feed-membrane leaching and membrane-stripping phase reactions were obtained, respectively by calculation.

关 键 词：乳化液膜(ELM)相界面反应 传质机理 镧 

分 类 号：TQ028.8[化学工程]