简介：Therestrictiononsulfurlevelingasolinehasbeenincreasinglytightened.TheU.S.TierⅡregulationrequiresareductionfromaverage340ppmto30ppmfrom2004to2008.Recentlysignificantprogresshasbeenmadeineffectivehighsulfurremoval,suchasposttreatmentofFCCgasolinebyselectivehydrotreating,SZorbsulfurremovaltechnology,OATSprocessetc.ThesulfurcontentofFCCgasolinecanbedeceasedtolessthan10ppm.WithregardtogasolinepoolcompositioninChina,itisveryimportanttolookforeffectivedesulfurizationprocessesthataresimple,straightforward,withlesshydrogenconsumption.Post-treatmentofFCCgasolineisapreferredoption.Fromthepointofviewofcomprehensiveutilization,alkylation,polymerization,isomerisationetc.canbeaddedtodesulfurizationprocesstomeettherequirementofultralowsulfur,premium.

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简介：Thebasic-nitrogenaromaticcompoundsinfeedstocksandliquidproductsfromthemicro-reactorandsolublecomponentsofcokeobtainedduringfluidcatalyticcracking(FCC)processwereanalyzedbythemicro-electrosprayionization(ESI)9.4TFouriertransformioncyclotronresonancemassspectrometry(FT-ICRMS)withanaveragemassresolvingpowerof300000atamassrangeof100-1200.Theanalyticalresultsrevealedthatthecokergasoil(CGO)containedahigherabundanceofbasic-nitrogenaromaticcompoundswiththetypeof-5Nto-9Ncomparedwiththoseindeasphaltedoil(DAO)andmixedFCCfeedstock.Aftercatalyticcracking,theabundanceoflowlycondensedbasic-nitrogenaromaticcompoundswasmuchlessthanthoseofhighlycondensedaromaticsintheliquidproducts,withthecarbonnumbermainlyrangingfrom6to25andtheaveragecarbonnumberoftheside-chainsequatingto1-5.Onthecontrary,withrespecttothesolublecomponentsofcoke,theabundanceoflowlycondensedbasic-nitrogenaromaticcompoundswasmorethanthoseofhighlycondensedaromatics,andthecarbonnumberrangedfrom12to30,whichwasmuchsmallerthanthatofthemixedFCCfeedstockbutslightlylargerthanthatofthecrackedliquidproducts.TheseresultshaveprovidedsomefundamentalinformationonFCCprocess.