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1、化學(xué)工程師Sum2O3No.O8ChemicalEngineer2012年第O8期科耕一肯秀緩文章編號(hào):1002—1124(2012)08—0010—03萃取法制備工業(yè)級(jí)磷酸二氫銨萃取劑的反萃取研究羅建洪,李軍,金央,馬春磊《四川大學(xué)化工學(xué)院。四川成都610065)摘要:本課題以高效的2一乙基己基磷酸(D2EHPA)為萃取劑,采用溶劑萃取法來(lái)提取MAP溶液中的M雜質(zhì),從而實(shí)現(xiàn)生產(chǎn)高品質(zhì)MAP的目的;但是實(shí)現(xiàn)其產(chǎn)業(yè)化的難點(diǎn)之一,就是反萃取劑的選擇,而在選擇反萃取劑時(shí)關(guān)鍵是實(shí)現(xiàn)絡(luò)合物D2EHPA—Fe的有效分離
2、,因?yàn)榻j(luò)合物D2EHPA—Fe是非常穩(wěn)定的,而且Fe的富集能使萃取劑老化。因此,選擇有效的反萃取劑來(lái)實(shí)現(xiàn)D2EHPA的循環(huán)回收利用是非常有必要的。以H2SO4+添加劑A為反萃取劑,通過(guò)考察反萃取劑濃度,相比,反應(yīng)溫度,反應(yīng)時(shí)間,攪拌速度等對(duì)反萃取Fe反萃取率的影響,求得最佳工藝條件為H:SO濃度:4tool·L-I,反應(yīng)溫度45℃,相比為1:l,攪拌速度550r·rain~,攪拌時(shí)間0.5h。.關(guān)鍵詞:濕法磷酸;MAP;D2EHPA;溶劑萃??;H2SO;反萃取中圖分類(lèi)號(hào):TQ126.3;TQ028.3文獻(xiàn)標(biāo)
3、識(shí)碼: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用濕法磷酸生產(chǎn)工業(yè)級(jí)MAP時(shí),溶