简介：Thepowderedactivatedcarbontreatment(PACT)processhasbeenwidelyusedinmanyindustrialfields,however,veryfewPACTprocessesarebuiltforpetrochemicalwastewatertreatmentinChina.AnindustrialPACTunitlaunchedinapetrochemicalplantwasintroducedandevaluatedfromboththepracticeandmechanismstudy.Practically,thePACTprocessshowedexcellentcapabilityinpollutantsremoval,shockresistance,toxicitytolerance,andtheCODandammonium-NineffluentofPACTunitassistedbyPACwasequalto15.5mg/Land0.7mg/LlowerthanthatwithoutPACaddition,respectively.ThewetoxidationregenerationunitwasquiteefficientinsupplyingregeneratedPAC,and,however,thehardcalciumsulphatescaleandthehighpollutantconcentrationsolutionneededtobecarefullycontrolled.Moreover,althoughthecarbonbalanceshowedthattheadsorptioncapabilityofregeneratedPACwasnegligible,thebiologicaltestsprovedthattheregeneratedPACincreasedmicrobeactivityupto17%morethanpureactivatedsludgesystem,whichwasalmostcompatiblewiththefreshactivatedcarbon.

简介：Theproject“StudyonFactorsInfluencingtheWaterQualityforEO/EGUnitandOptimizationofWaterTreatmentSystem”performedbytheChemicalIndustryDivisionofShanghaiPetrochemicalCompanyandtheResearchInstituteofYanshanPetrochemicalCompanyhadpassedonJuly8,2004thetechnicalappraisalorganizedbySinopecCorp.Thistech-

简介：FreshZSM-5zeolitecatalystswerepretreatedat460℃and500℃withvariouscumulativeamountofwaterfeed(CAWF)inafixedbedreactor.Thecatalyticprocesswascarriedoutunderthefollowingconditions:atemperatureof480℃;amethanolWHSVof3h-1;amethanolpartialpressureof30kPa;andatimeonstreamof12h,24hand48h,respectively.TheBETparametersofcatalystsanddiffusioncoefficientsoftolueneshowedthatthereweretwotypesofmesoporesgeneratedunderdifferenthydrothermalconditions.MildtemperatureandmoderateCAWFconditionsledtoexternalopenmesoporeswhichcouldbeenteredfromtheexternalsurfaceofthezeolite,whileahightemperatureorahighCAWFconditionresultedinthegenerationofmacroporesorinternalisolatedmesopores,whichwereoccludedinthemicroporousmatrix.TheTGAresultsshowedthatcatalystwithexternalopenmesoporeshadgoodabilitytoresistcokeaccumulationandgoodperformanceonpropyleneselectivity,whiletheinternalisolatedmesoporesdidnocontributetotheincreaseddiffusivityofreactantsandproducts.