乳化萃取法脱除Mg^(2+)制备工业级磷酸二氢钠的研究  

Study on removal of Mg^(2+) from sodium dihydrogen phosphate by emulsification extraction

作　　者：罗建洪[1] 李军[1] 金央[1] 马力[1] 

机构地区：[1]四川大学化工学院,四川成都610065

出　　处：《化学工程师》2012年第10期1-3,13,共4页Chemical Engineer

基　　金：国家科技支撑计划项目(2007BAE58B00)

摘　　要：本文以高效的二(2-乙基己基磷酸)(D2EHPA)为萃取剂,采用乳化萃取技术来提取NaH2PO4溶液中的Mg2+杂质,通过考察萃取剂浓度,水相溶液pH值,相比(水相:有机相),乳化速度等对萃取Mg2+萃取率的影响,求得适宜工艺条件:D2EHPA体积分数:75%,相比(A/O):2∶1,起始NaH2PO4溶液pH值为4,搅拌速度:3000r.min-1;实验结果表明,在适宜工艺条件下,经过三级萃取,可制取工业级NaH2PO4。In the removal of Mg2＋ with emulsification extraction process, The extraction of Mg2＋ from NaH2PO4 solution is studied with kerosene as a solvent, D2EHPA as an extractant. To study the extraction ratio and advan- tages of the emulsification extraction process in the removal of Mg2＋, various parameters -D2EHPA volume fraction, phase volume ratio, initial pH of NaH2PO4 solution, stirring speed are studied and optimized. The optimized param- eters affecting the process are as follows： The D2EHPA volume fraction： 75%; the phase volume ratio （A/O）： 2：1; the initial pH of NaH2PO4 solution： 4, stirring speed： 3000r·min-1. The extraction experiments from practical NaH2PO4 solution showed that superior grade NaH2PO4 can be obtained by three levels of extraction under optimal condition.

关 键 词：湿法磷酸 NaH2PO4 乳化萃取 Mg2+ 

分 类 号：TQ131.13[化学工程—无机化工]