简介:Single-eventmicrokinetic(SEMK)modelofthecatalyticcrackingofmethylcyclohexaneadmixedwith1-octeneoverREUSYzeolitesat693K—753Kintheabsenceofcokeformationisenhanced.Tokeepconsistencywiththewellknowncarbeniumionchemistry,hydridetransferformingandconsumingallyliccarbeniumionsinthearomatizationofcycloparaffinsarefurtherinvestigatedanddifferentiated.Thereversibilityofendocyclicβ-scissionandcyclizationreactionsisrefinedbyaccountingexplicitlyforthereactingolefinsandresultingcycloparaffinsinthecorrespondingthermodynamics.24activationenergiesforthereactionsinvolvedinthecrackingofcycloparaffinsareobtainedbytheregressionof15setsofexperimentaldataupontakingtheresulting37maincrackingproducts,i.e.,responsesintoaccount.TheenhancedSEMKmodelcanadequatelydescribethecatalyticbehaviorof37mainproductswithconversionandtemperature.
简介:Thispaperhasstudiedthevapor-liquidequilibrium(VLE)forthesalt-containingextractivedistillationofthe1-propanol/watersystem.BinaryVLEdataweremeasuredforthesystemsof1-propanol(1)/KAc(4),ethanediol(3)/KAc(4),and1-propanol(1)/ethanediol(3),withtheVLEdatacorrelatedwiththeNRTLmodelinordertoobtainthemodelparametersofthesebinarysystems.ThebinaryVLEdatacitedintechnicalliteraturewerecorrelatedtoobtainthemodelparametersforotherbinarysystems.VLEdataofternaryandquaternarysystemspredictedbytheNRTLmodelagreedwellwiththeliteraturedata.TheinfluenceofKAc,ethanediol,andtheKAc/ethanediolmixtureonvolatilitybetween1-propanolandwaterwasinvestigatedrespectively.Testresultsshowedthattheabove-mentionedmaterials(KAc,ethanediol)andtheirmixture(KAcandethanediol)havedifferentinfluenceonthevolatility.Whenx3=0.5,andx4=0.05,theazeotropicpointcanbeeliminated.TheNRTLmodelmethodofsalt-containingVLEissimpleandeffectiveforthepredictionofthesystem’sVLEdata.
简介:The^Siand^1Hhigh-resolutionliquid-phaseNMRhasbeenusedtoinvestigatethehydrolysisprocessofthetetraethylorthosilicate(TEOS).^1H-NMRspectroscopyshowsthatthehydrolysisofTEOSinTPAisfasterthaninTEA.TheimpactsofTPAandTEAontheTOEShydrolysisprocessanditshydrolyzedproductdistributionhavebeenobservedby^29Si-NMRrespectively.Theinfluencesofwaterandtheisopropylalcoholonhydrolysishavealsobeendiseussed.ThepresenceofTBOTmarksanevidentdifferentiationbetweenTPAandTEAforhydrolysisin^29Si-NMRspectra.
简介:Theprojectforcatalyticconversionofbiomassinto1,2-propanedioljointlydevelopedbytheCASDalianInstituteofChemicalPhysics(DICP)hasmadegreatstridesaftersuccessfulcommissioningofa100t/apilotplantatthefirstattemptwiththeconversionrateandproductselectivitybothreachingover90%.