简介：Theneedforcleanerfuelshasresultedinacontinuingworldwidetrendtoreducedieselsulfurandaromatics.Therearemanyapproachestoreducingsulfurandaromaticsindiesel.Mostofthemhaveacommondrawbackofhighcostbecauseofadoptingtwostagesofhydrotreatingandusingnoble-metalcatalyst,especiallyforreducingaromatics.TheattempttoresolvethisissuehasledtotherecentdevelopmentoftheSingleStageHydrotreating(SSHT)processbyResearchInstituteofPetroleumProcessing(RIPP),SINOPEC.TheSSHTprocessisasingle-stagehydrotreatingtechnologyforproducinglowsulfurandlowaromaticsdiesel.Theprocessusesoneortwonon-noble-metalcatalystssystemandoperatesatmoderatepressure.Whenrevampinganexistingunittomeetlowaromaticsdieselspecification,theonlythingtodoistoaddareactororreplacetheexistingreactor,Inpilotplanttests,theSSHTtechnologyhassuccessfullytreatedSRGO(StraightRunGasOil),LCO(LightCycleOil)ortheblendofthem.ItisshownthatbyusingtheSSHTprocessdieselwithsulfurof30ppmandaromaticsof15m%canbeproducedfromMiddle-EastSRGOanddieselwitharomaticscontentof25m%canbeproducedfromcrackedfeed,suchasFCC-LCO.Highdieselyieldandcetanenumbergain(fromcrackedfeedstocks)givetheSSHTtechnologyaperformanceadvantagecomparedtoconventionalhydrocrackingandhydrotreatingprocesses.Thelowerinvestmentandoperatingcostisanotheradvantage.ThefirstcommercialapplicationoftheSSHTtechnologyhasbeeninoperationsinceSeptember2001.

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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：TheGCtypeaxiallow-pressuremethanolsynthesistowerdevelopedbyNanjingGuochangChemicalEngineeringCompanyhadpassedappraisalorganizedbyChinaPetroleumandChemicalSociety.Thistechnologyhasbeenfirstsuccessfullyappliedonthe50kt/alow-pressuremethanolunitoperatedbyShandongJiutaiChemicalTechnologyCompany,

简介：Nickel-basedcatalyst[N,N]NiBr2,inwhich[N,N]standsforN-(2,6-diisopropylphenyl)pyridine-2-carboxaldimine,showshighactivityforethylenepolymerizationinthepresenceoforganoaluminumcompoundsunderhighethylenepressuretoyieldpolyethylenecharacteristicoflowmolecularweightandhighlybranchedchains.Tolueneasthesolventismoreinfavorofcatalystactivity,highermolecularweightandbranchedchainsinpolyethylenestructureascomparedtohexanesolvent.