A review of industrial catalytic wet air oxidation processes

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1、/CATALYSISTODAYCatalysisToday27(1996)195-202ELSEVIERAreviewofindustrialcatalyticwetairoxidationprocessesF.Luck1AnjouRecherche,CompagnieG~ngraledesEaux-Ol'VResearchCenter,78603MaisonsLaffitteCedex,FranceAbstractWetoxidationisathermalaqueousphaseprocessinwhichorganicandinorganicsubstance

2、sinaqueoussolutionsorsuspensionsareoxidizedbyoxygenorairatelevatedtemperaturesandpressures.Variouscatalystshavebeendevelopedtoreducetheseverityofthereactionconditions.Themainfeaturesoffivecommerciallypractisedcatalyticwetoxidation(CWO)processesfortreatingindustrialwastewatershavebeenan

3、alyzedandpresentedinthispaper,alongwithhighlightsonseveralongoingdevelopmentsofnewCWOtechnologies.Keywords:Industrialcatalyticwetairoxidationprocesses;Wetoxidation;Oxidation1.Introductionintumoxidizedandeventuallyconvertedtocar-bondioxideandwater,withoutemissionsofNOx,SO2,HC1,dioxins,f

4、urans,flyash,etc.ThelastWetoxidation(WO)isanattractivedestruc-residualorganiccompoundsarefattyacids,espe-tionmethodforthetreatmentofwastestreamsciallyaceticacid.Organicnitrogencompoundswhicharetoodilutetoincinerateandtooconcen-tratedforbiologicaltreatment.WOcanbedefinedareeasilytransfo

5、rmedintoammonia,whichisastheoxidationoforganicandinorganicsub-verystableinWOconditions.stancesinanaqueoussolutionorsuspensionbyFig.1showsabasicflowdiagramofaWOmeansofoxygenorairatelevatedtemperaturesplant,whichconsistsmainlyofahigh-pressureandpressures.Theoriginaldevelopmentworkpump,an

6、airoroxygencompressor,aheat-doneonWOintheUSAtookplacesomefiftyexchangeraswellasareactorwithareliefvalveyearsago.Zimmermandidextensivetestingofandadownstreamseparator.Thewasteisretainedwetairoxidationtechnologyanditsapplicationtointhereactorforasufficientperiodoftimetotreatingspentpulpm

7、illliquor[1].Typicalcon-achievethedesiredchemicaloxidation(30--120ditionsforwetoxidationrangefrom180°Cand2min).ThesimplestreactordesignisusuallyaMPato315°Cand15MPa.Residencetimesmaycocurrentverticalbubblecolumnwithaheight-rangefrom15to120minandthechemicaloxygento-diameterratiointhera