用两相滴定法研究PMBP与P350对Co(Ⅱ)、Ni(Ⅱ)的协同萃取机理
来源期刊:中南大学学报(自然科学版)1987年第4期
论文作者:吴斌 王开毅 张祥麟
文章页码:464 - 469
关键词:溶剂萃取; 协同萃取; 萃取剂; 镍离子; 钴离子; 滴定; 机理; PMBP; P350
Key words:solvent extraction; synergic solvent extraction; (xtractiveagent; nickelion; cobaltion; titration; mechanism
摘 要:本文采用两相滴定法研究了PMBP苯溶液在硝酸钠介质中对Co(Ⅱ)的螯合萃取机理,确定了萃合物组成为CoA2及CoA2·HA(HA及A分别表示PMBP及其阴离子),并求得相应的萃合常数:1gβ200=7.26,1gβ210=9.96。进而又研究了PMBP与P350对Co(Ⅱ)、Ni(Ⅱ)的协同萃取机理,在水相组成相同的条件下,有机相选用了七种不同的稀释剂,所得结果见下表(表中B表示P350,HA及A同上)。
Abstract: The chelate extraction of Co(Ⅱ) with PMBP (HA) in benzene and the synergistic extractionof Co(Ⅱ) and Ni (Ⅱ) with PMBP and P350 (B) in each of seven organic solvents (S)-benzene①,toluene②, xylene③, n-hexane④, n-heptane⑤. isopropyl ether⑥ and carbon tetrachloride⑦ wereinvestigated by using the two-phase titration method. The extraction equilibrium constants β2jmcorresponding to the extracted chelates MA2. (HA). mB have been evaluated as shown in Table 4.