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1、AppliedCatalysis,61(1990)329-349329ElsevierSciencePublishersB.V.,Amsterdam-PrintedinTheNetherlandsFixedBedandSlurryReactorStudiesofFischer-TropschSynthesisonPrecipitatedIronCatalystDRAGOMIRB.BUKUR*,SNEHALA.PATELandXIAOSULANG”Kinetics,CatalysisandReactionEngineeringLaboratory,DepartmentofChemica
2、lEngineering,TexasA&MUniversity,CollegeStation,TX77843(U.S.A.),tel.(+1409)8453401,fax(+I-409)8456446.(Received20October1989,revisedmanuscriptreceived19January1990)ABSTRACTAsampleofcommercialRuhrchemiecatalyst(100Fe/4.3Cu/4.1K/25SiO,)fortheFischer-Tropschsynthesiswastestedinafixedbedandinaslurry
3、reactoratprocessconditionssimilartothoseusedincommercialreactors.Theapparentreactionrateconstant,calculatedassumingthatthereactionratehasafirstorderdependenceonhy&ogenpressure,wasnearlythesameinbothreactorsduringthefirst380honstream.Thecatalystdeactivatedslowlywithtime-on-streaminbothreactors,w
4、hilethehydrocarbonselectivityshiftedtowardslowermolecularweightproducts.Secondaryreactions(1-alkenehydrogenationandisomerization)increasedgraduallywithtime-on-streamintheslurryreactor,whereastheoppositetrendwasobservedinthefixedbedreactor.Theeffectsofprocessconditionsonthecatalystactivityandpro
5、ductselectivities(hydrocarbonproductdistribution,totalalkenecontent,2-alkeneselectivity,organicoxygenates)werealsoinvestigated.Keywords:Fischer-Tropschsynthesis,Iron,syngasconversion,selectivity(hydrocarbons,al-kenes),slurryreactor,fixed-bedreactor,potassium,silica.INTRODUCTIONFischer-Tropschsy
6、nthesis(FTS)isconsideredapotentiallyeconomicpro-cessforconvertingcoal(ornaturalgas)derivedsynthesisgasintotranspor-tationfuels(gasolineanddiesel).ThistechnologyispracticedoncommercialscaleatSASOLplantsinSouthAfrica,wheretwotypesofreactorsareem-ployed.Thecirculatingfluidizedbed(Synthol)reactorsh
7、avehighselectivitytogasolinerangeproductsandproduceverylittlewaxes,whereasfixedbed(ARGE)reactorsproducepredominantlydieselfuelandhydrocarbonwaxes.Thisvariationinproductdistributionisachievedthroughtheuseofdifferent“Presentaddress:
