Investigation of three-liquid-phase extraction systems for t(7)

K.Xieetal./SeparationandPuri cationTechnology76 (2010) 191–197197

4.Conclusion

Differentorganicextractants,polymersandinorganicsaltswereemployedinpreliminaryscreeningtestscarriedouttodeterminewhichofthesechemicalscouldcombinetoformstableorganicextractant–polymer–salttriphasicsystems.TheutilityoftheTESsonpartitionofTi(IV),Fe(III)andMg(II)wereassessed.Fromtheresults,TRPOandD2EHPAareconsideredtobeexcellenttopphase-formingcandidatesowingtotheirgoodphysicochemicalproperties.TheselectivityofmetalionswasfoundtodependonthepHvalueoftheaqueoussolution,thevalenceofmetalions,thepresenceofcomplexingagents,thehydrophobicitydif-ferenceamongphases,theextractedmetalspeciesandextractionmechanism.Themostimportantobservationinthepresentworkistheimprovementinaf nityofFe(III)forthePEG-richphaseandˇTi(IV)/Fe(III),t/mwhenEDTAisusedasacomplexingagent.ˇTi(IV)/Fe(III),t/msigni cantlyincreasedfromanegligibleamountto80usingTRPO–PEG2000–(NH4)2SO4TESatpH0.5.WhileMg(II)showedanabsolutepreferenceforthesalt-richbottomphase.TheseresultssuggestanexcitingpotentialmeansofseparationofTi(IV),Fe(III)andMg(II).

FurtherresearchisunderwaytocontinueoursurveyofusingtheTRPO–PEG2000andD2EHPA–PEG2000basedTESswiththecomplexingagentEDTAtosimultaneouslyseparateTi(IV),Fe(III)andMg(II)atalargeextent.Acknowledgement

TheauthorsthanktheNationalBasicResearchProgramofChina(973project2007CB613507)for nancingthiswork.References

[1]J.S.Gill,H.Singh,C.K.Gupta,Studiesonsupportedliquidmembraneforsimul-taneousseparationofFe(III),Cu(II)andNi(II)fromdilutefeed,Hydrometallurgy55(2000)113–116.

[2]L.H.M.daSilva,W.Loh,Polymerinducedmultiphasegenerationin

water/organicsolventmixtures.Strategiestowardsthedesignoftriphasicandtetraphasicliquidsystems,mun.(1998)787–788.

[3]J.Chen,H.Z.Liu,B.Wang,Studyonthethree-phaseextractionofpenicillin

Gwithasinglestepmethod,in:ProceedingsoftheConferenceonSolventExtraction(ISEC2002),CapeTown,2002,pp.602–606.

[4]S.F.Shen,Z.D.Chang,J.Liu,Separationofglycyrrhizicacidandliquiritinfrom

glycyrrhizauralensisFischextractbythree-liquid-phaseextractionsystems,Sep.Purif.Technol.53(2007)216–223.

[5]S.F.Shen,Z.D.Chang,H.Z.Liu,Three-liquid-phaseextractionsystemsforsep-arationofphenolandp-nitrophenolfromwastewater,Sep.Purif.Technol.49(2006)217–222.

[6]P.H.Yu,Z.D.Chang,Y.C.Ma,Separationofp-nitrophenolando-nitrophenol

withthree-liquid-phaseextractionsystem,Sep.Purif.Technol.70(2009)199–206.

[7]P.N.Remya,M.L.Reddy,Solventextractionseparationoftitanium(IV)vana-dium(V)andiron(III)fromsimulatedwastechlorideliquorsoftitaniummineralsprocessingindustrybythetrialkyphosphineoxideCyanex923,J.Chem.Technol.Biotechnol.79(2004)734–741.

[8]K.C.Sole,Recoveryoftitaniumfromtheleachliquorsoftitaniferousmagnetites

bysolventextraction:Part1.Reviewoftheliteratureandaqueousthermody-namics,Hydrometallurgy51(1999)239–253.

[9]K.C.Sole,Recoveryoftitaniumfromtheleachliquorsoftitaniferousmagnetites

bysolventextraction:boratory-scalestudies,Hydrometallurgy51(1999)263–274.

[10]K.C.Sole,A.Feather,J.P.O’Connell,Recoveryoftitaniumfromtheleachliquors

oftitaniferousmagnetitesbysolventextraction:Part3.Continuousmini-planttrials,Hydrometallurgy51(1999)275–284.

[11]K.SajiJohn,J.Saji,M.L.P.Reddy,Solventextractionoftitanium(IV)fromacidic

chloridesolutionsbyCyanex923,Hydrometallurgy51(1999)9–18.

[12]R.K.Biswas,M.R.Zaman,M.N.Islam,ExtractionofTiO2+from1M(Na+,H+)

SO42 byD2EHPA,Hydrometallurgy63(2002)159–169.

[13]R.K.Biswas,D.A.Begum,KineticsofextractionandstrippingofTi(IV)in

HCl–D2EHPA–kerosenesystemusingthesingledroptechnique,Hydromet-allurgy55(2000)57–77.

[14]T.Sato,T.Nakamura,Theextractionoftitanium(IV)andaluminium(III)from

sulphuricacidsolutionsbydi-(2-ethylhexyl)-phosphoricacid,Anal.Chim.Acta76(1975)401–408.

[15]K.M.Allal,D.Hauchard,M.Stambouli,Solventextractionoftitaniumbytrib-utylphosphate,trioctylphosphineoxideanddecanolfromchloridemedia,Hydrometallurgy45(1997)113–128.

[16]Z.SHu,X.P.Hu,W.Cui,ThreephaseextractionstudyII

TBP–kerosene/H2SO4–TiOSO4systemandthepreparationofultra nepowderofTiO2,ColloidSurf.A155(1999)383–393.

[17]M.X.Meng,S.Yu,J.Chen,Kineticsofiron(III)extractionwithprimaryamine

andTBPusingamodi edrotatingdiffusioncell,Hydrometallurgy41(1996)55–70.

[18]J.Chen,S.Yu,H.Z.Liu,Newmixedsolventsystemsfortheextractionandsepa-rationofferricironinsulphatesolutions,Hydrometallurgy30(1992)401–416.[19]P.Mahi,N.T.Bailey,Theuseofcoalspoilsasfeedmaterialsforaluminarecovery

byacid-leachingroutes.4.Theextractionofironfromaluminiferoussolutionswithamines,inparticularalamine336,Hydrometallurgy13(1985)293–304.[20]J.P.Martins,J.S.dosReisCoimbra,F.C.deOliveira,Liquid–liquidequilibriaofan

aqueoustwo-phasesystemcontainingpoly(ethylene)glycol1500andsulfatesaltsatdifferenttemperatures,J.Chem.Eng.Data53(2008)238–241.

[21]A.Salabat,Thein uenceofsaltsonthephasecompositioninaqueoustwo-phasesystems:experimentsandpredictions,FluidPhaseEquilibr.187–188(2001)489–498.

[22]Y.Wu,Z.Zhu,D.Lin,Modelingofliquid–liquidequilibriumofpolyethylene

glycol-saltaqueoustwo-phasesystems—theeffectofpartialdissociationofthesalt,FluidPhaseEquilibr.154(1999)109–122.

[23]V.Kislik,A.Eyal,AcidityofdependenceofTi(IV)extraction:acriticalanalysis,

SolventExtr.Ion.Exc.11(1993)259–283.

[24]R.D.Rogers,A.H.Bond,C.B.Bauer,Metalionseparationsinpolyethyleneglycol-basedaqueousbiphasicsystems:correlationofpartitioningbehaviorwithavailablethermodynamichydrationdata,J.Chromatogr.B680(1996)221–229.[25]B.I.Nabivanets,Electromigrationoftitanium(IV)ionsinnitric,hydrochloric,

andsulphuricacids,Russ.J.Inorg.Chem.7(1962)210–212.

[26]I.Szilágyi,E.Königsberger,P.M.May,Characterizationofchemicalspeciationof

titanylsulfatesolutionsforproductionoftitaniumdioxideprecipitates,Inorg.Chem.48(2009)2200–2204.

[27]K.P.Ananthapadmanabhan,E.D.Goddard,Aqueousbiphaseformationin

polyethyleneoxide–inorganicsaltsystems,Langmuir3(1987)25–31.

[28]D.J.Shaw(Ed.),IntroductiontoColloidandSurfaceChemistry,4thed.,Butter-worths,London,1992.

[29]M.A.Eiteman,Temperature-dependentphaseinversionanditseffectonpar-titioninginthepoly(ethyleneglycol)–ammoniumsulfateaqueoustwo-phasesystem,J.Chromatogr.A668(1994)13–19.

[30]L.Bulgariu,D.Bulgariu,Extractionofmetalionsinaqueouspolyethyleneglycol-inorganicsalttwo-phasesystemsinthepresenceofinorganicextractants:correlationbetweenextractionbehaviourandstabilityconstantsofextractedspecies,J.Chromatogr.A1196–1197(2008)117–124.

[31]M.Shibukawa,N.Nakayama,T.Hayashi,Extractionbehaviourofmetalions

inaqueouspolyethyleneglycol-sodiumsulphatetwo-phasesystemsinthepresenceofiodideandthiocyanateions,Anal.Chim.Acta427(2001)293–300.[32]R.D.Rogers,S.Grif n,Partitioningofmercuryinaqueousbiphasicsystemsand

onABECTMresins,J.Chromatogr.B711(1998)277–283.

[33]L.NashKenneth,AqueousComplexesinf-ElementSeparationScience,

Metal–IonSeparationandPreconcentration.ACSSymposiumSeries,AmericanChemicalSociety,Washington,DC,2009,pp.52–78.