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时间:2020-03-27
《萃取法制备工业级磷酸二氢铵-萃取剂的反萃取研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、化学工程师Sum2O3No.O8ChemicalEngineer2012年第O8期科耕一肯秀缓文章编号:1002—1124(2012)08—0010—03萃取法制备工业级磷酸二氢铵萃取剂的反萃取研究罗建洪,李军,金央,马春磊《四川大学化工学院。四川成都610065)摘要:本课题以高效的2一乙基己基磷酸(D2EHPA)为萃取剂,采用溶剂萃取法来提取MAP溶液中的M杂质,从而实现生产高品质MAP的目的;但是实现其产业化的难点之一,就是反萃取剂的选择,而在选择反萃取剂时关键是实现络合物D2EHPA—Fe的有效分离
2、,因为络合物D2EHPA—Fe是非常稳定的,而且Fe的富集能使萃取剂老化。因此,选择有效的反萃取剂来实现D2EHPA的循环回收利用是非常有必要的。以H2SO4+添加剂A为反萃取剂,通过考察反萃取剂浓度,相比,反应温度,反应时间,搅拌速度等对反萃取Fe反萃取率的影响,求得最佳工艺条件为H:SO浓度:4tool·L-I,反应温度45℃,相比为1:l,搅拌速度550r·rain~,搅拌时间0.5h。.关键词:湿法磷酸;MAP;D2EHPA;溶剂萃取;H2SO;反萃取中图分类号:TQ126.3;TQ028.3文献标
3、识码:AStudyonthestrippingoftheextractantfromtheproductionofindustrial-gradeammoniumdihydrogenphosphatesolutionbysolventextraction·LUOJian—hong,LIJun,JINYang,MAChun—lei(Dep.ofChemicalEngineering,SiehuanUniversity,Chengdu610065,China)Abstract:Inthispaper,theef
4、ectiveD2EHPAisempolyedasextractant.BasedOUtheextractantofD2EH-PA,TheabilitiestoextractMfromammoniumdihydrogenphosphatesolutionwiththeseparationmethodsofex—traction,emulisificationextraction,saponifiedD2EHPA,andpredispersedsolventextractionhavebeenstudied.A
5、ndsuperiorgradeNI-LH2PO4(MAP)canbeobtainedbytwolevelsofextractionunderoptimalcondition.Howeveroneofdificultiestorealizeindustrializationisthechoiceofstrippant.Thekeyforselectionofstrippantistoreal-izethecomplexD2EHPA-Feefectiveseparation,becausecomplexD2EH
6、PA-Feisverystable,moreovercon-eentrationofFe“cancausetheextractantaging.Thereforethechoiceoftheefectivestrippanttorealizetheex—tractantD2EHPArecyclinguseisnecessary.InthestrippingofMg27Feintheorganicphase.H~O4+additiveAisusedtOstripFe.tOstudythestrip-pinge
7、xtractionratioandadvantagesofthestrlppantH2S04intheremovalofFe,variousparameters:concentrac-tionofH2SO4,reactiontemperature,phasemassratio,stirringspeed,stirringtimearestudiedandoptimized.Theoptimizedparametersafectingtheprocessareasfollows:Theconcentracti
8、onofHzSO4:4mol·L一;thereactiontem—perature:45oc;thephasevolumeratio:1:l;stirringspeed:550r。min,stirringtime:O.5h.Keywords:wet-processphosphoricacid;MAP;D2EHPA;extraction;H2SO4;reverseextraction用湿法磷酸生产工业级MAP时,溶
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