二室双极膜电渗析器在低浓度二氧化硫净化工艺中应用的可行性

:1007-8924(2003)02-0032-05(,410083):,,,96.09mA/cm21.21.7V,(80%100%)..:;;:TQ028.8:A..6..2070,SO25%,203.7108t.1995SO22.370107t,.,,.SO2SO2.,SO2SO2SO2.,.SO23.5%,;SO23.5%,,SO23.5%.,,[1],,,.-,[2].-:2NaOH+SO2=Na2SO3+H2O(1)SO2,():Na2SO3+SO2+H2O=2NaHSO3(2)SO2,NaHSO3,pH,pH,.SO2,pH:2NaOH+CO2Na2CO3+H2OpH=11.5(3)CO2:Na2CO3+H2CO32NaHCO3pH=8.4(4)Na2CO3+H2SO3Na2SO3+H2O+CO2pH=7.0(5)SO2:Na2SO3+H2SO32NaHSO3pH=4.4(6)pH4.4,SO2.pH4.4SO2,SO2.,SO2pH3.7.Na2SO3NaHSO3SO2[3]:pSO2=M(2CSO2()-CNa+)2CNa+-CSO2()(7):2002-01-04;:2002-04-04:(1966-),,,,.232Vo1.23No.220034MEMBRANESCIENCEANDTECHNOLOGYApr.2003,pSO2()SO2,mmHg(1mmHg=1331322Pa);M;CSO2()CNa+Na+(100molH2O),mol/100molH2O.,M:lgM=4.519-1987T(8),T,K.,SO2:pSO2=M(2CSO2()-CNa++2CSO42-)CNa+-CSO2()-2CSO42-(9),CSO42-SO42-(100molH2O).(7),SO2,.,SO2.,SO2.SO2,SO2(85%100%),100.,SO2,,.,,.1(BPM),(N)(P)[3,4].(SPEK),,.2.057V,11229VH2O2,::2H2O2H++2OH-0.83V(10):2H2O+2eH2+2OH-0.83V(11):H2O1/2O2+2H++2e1.23V(12):3H2O1/2O2+H2+2H++2OH-2.06V(13),198.5kJ/mol,79.9kJ/mol.H2O2.,:,1tNaOH15002000kWh,22003000kWh;;O2H2;,,,.[58],.,HSO-3SO2-3,HSO-3,SO2-3.2,1,,.11.;2.;3.;C.;AC.;P.;:NF-1,;3661,-.NaHSO32:33,NaHSO3,.,pH,SO2-3SO2-4H+.Na2SO3.33.1,2.0869mol/L,NaHSO31.9109mol/L,106.76mA/cm2,,NaHSO3:=100%=ZFQCIt(14),Z1;F;Q(L);;C(mol/L);I(A),t(s).=100%(15)1.1/minNaHSO3/(molL-1)/(mAcm-2)NaHSO3/%/%/mL301.9109106.769.3843.4440NF-1()301.9109106.769.5147.75503361()301.9109106.769.9345.9750-()301.9109106.7611.2845.0910NF-1-,47.75%45.09%,-,,30min10mL,-,,,.,-(80).3.22,,,35.6mA/cm264.06mA/cm2,-,1.212V,0.83V.,.,.3.3Na2SO33,Na2SO32.OH-.,100%,,,,.,Na2SO3NaHSO3,OH-HSO3-,OH-.,,3423OH-,OH-,H+,.,,OH-,.,,HSO-3OH-,.(14)[9].3HSO3-3.43,96.09mA/cm280.08mA/cm2,,SO2-3(1.9866mol/L),.(100mA/cm2),,.43.54,,HSO3-,,HSO3-SO32-.,I,t:n=It/ZF,,..,.2.0869mol/L1.0435mol/L.3.6HSO3-pHHSO-3,HSO-3,H+,pH,,[1].3,53,,,,pH.5HSO-3pH3.7SO2HSO3-SO32-(7),SO2HSO-3.,50,110[1].,50110SO2.6,HSO3-80%,50110SO2,HSO3-80%,.2:356HSO3-SO24.,,,,,.100mA/cm21.21.7V,,.HSO3-80%,SO2,,.HSO3-pH,..,.[1].[M].:,1981.17247.[2]LiuKJ,NagsubramanianK.Membraneelectrodialysispro2cessforrecoveryofsulfurdioxidefrompowerplantstackgases[J].JMembrSci,1978,3:7183.[3]BauerB,GernerFJ,StrathmanH.Developmentofbipo2larmembranes[J].Desalination,1988,68:279292.[4]RamirezP,ManzanaresJA,MafeS.Changesurfacefilms[J].BerBunsengesPhysChem,1991,95:499503.[5]LiuKJ,LeeHL.Bipolarmembranes[P].USPat:4584246,1986-04-22.[6]MuellerH,PuetterH.Productionofbipolarmembrane.USPat:4670125,1987-06-02.[7].ƒ‰Ó[A].,ƒ‰Ó[C].2.56.7183.[8]ManiandKN,ChlandaFP.Recoveryofspentmineralacidsbyelectrodialyticwatersplitting[A].InternationalTechnicalConferenceonmembraneseparationprocesses[C].Brighton:UK,24-26May,1989G2:235-250.[9],,.[M].:,2001.424425.ApplicationofbipolarmembraneelectrodialysiswithtwocellsintheprocessofpurifyingdilutesulphricdioxideBAOJiqing,ZHANGQixiu(KeyLab.ofMetallurgicalSeparationScience&Engineering,CentralSouthUniversity,Changsha410083,China)Abstract:Anapplicationofbipolarmembraneelectrodialysiswithtwocellsintheprocessofpurifyingdilutesulphricdioxidewasprovided.Theapparatuswasconsistedofbipolarmembraneandion-exchangemembranesmadeinChina.Theresultsindicatethatthehighelectriccurrentcoefficient(80%100%)andrapidconversionratiocouldbeobtainedundertheelectriccurrentabout96.09mA/cm2andmembranepotential(1.21.7V).Theproblemsexistinginthebipolarmembranesandthefuturetrendsinthebipolarmembraneswereproposedinthepaper.Keywords:bipolarmembrane;sulfurdioxide;electrodialysis3623