化学反应工程-exercise_2_answerVIP专享VIP免费

1ExercisesforChemicalReactionEngineeringI.Fillineachblankwithanappropriatetermorvalue:1．Inthethreeidealreactors,batchreatorisanunsteady-stateoperationwherecompositionchangeswithtimebutthecompositionisuniformthroughoutthereactor.Plugflowreactorandmixedflowreactorarethetwosteady-stateflowreactors,thefirstisusuallycalledPFRwhichhasnobackmix,theotherisusuallycalledMFRorCSTRwhichhasthemaximalextentofbackmix.2．H2andO2combustcompletelyina0.2m3reactorandtheflowrateofH2Ooutofthereactoris6kmol/s.ThentherateofreactionofO2is15kmol/(m3.s).3．Iftherateexpressionof2AAABdCr0.05CCdt3(mol/mmin)isrewrittenas'2AAABdPrkPPdt(min/MPa),thenthevalueoftherateconstantk4.52×103(MPa-2min-1).Thereactantgasescanbeseenasidealandthetemperatureis400K.4．Therateexpressionofareaction,0.50.5ABRSis0.52AABrCCTherateequationisifthestoichiometricequationiswrittenas22ABRS.5．ForthereactionArR,therateequationis220AArCmol/(cm3.min).Thentherateconstantis1.2×10-3m3/(mol.hr).6．At1200K,thereactionrateofAis30timesasrapidlyasat1000K.Theactivationenergyforthisreactionis169.7kJ/mol.7．LiquidA(CA0=1mol/Liter)decomposesbysecondorderkinetics,2AArkC.50%Aisconvertedin10minutesinabatchreactor.Therateconstantofthisreaction,k=0.1liter/(mol.min)(unitsshouldbegiven).If80%Aistobeconverted,weshouldmakea40minutesrun.0.52AABrCC28．Anelementaryreactionsinseries,12kkARS(k1=k2)takesplaceinabatchreactor.TheinitialconcentrationofAisCA0,andthatofRandSareCR0=CS0=0.Whent=1/k1,theconcentrationofRreachesthemaximumvalue,whichisequaltoCA0/e.9．Foragasphasevaryingvolumereaction32ABR,someinertgas,Arisintroducedintothereactantmixture.TheproportionbetweenAr,AandBis2:1:3(mol)initially.Thefractionalchangeinvolumeofthesystem,A=－1/3.IftheconversionofAis60%,Thevolumeofthesystemis0.8timesashighastheinitialvolume,V0,andtheconcentrationofA,CAis0.5timesashighastheinitialconcentrationCA0.10．Thetwomethodsforanalyzingkineticdataweusuallyuseareintegralanddifferentialmethods.11．Forreactionsinparallel,ahighreactantconcentrationfavorsthereactionofhigherorder,andalowreactantconcentrationfavorsthereactionoflowerorder.Ahightemperaturefavorsthereactionofhigheractivationenergy,andlowtemperaturefavorsthereactionofloweractivationenergy.12．ConsideraporouscatalystparticlebathedbyreactantA.TherateofreactionofAfortheparticleasawholemaydependon:①surfacekinetics;②porediffusionresistance;③temperaturegradientswithintheparticle;④filmtemperaturegradients;⑤filmdiffusionresistance.13．Aplugflowreactor(2m3)processesanaqueousfeed(100liters/min)containingreactantA.Thereactionisreversibleandrepresentedbymin/,01.004.0,litermolCCrRARAATheequilibriumconversionofAis0.8,andtheactualconversionachievedinthereactoris0.506.14．GiventhemultiplereactionwithE1=50,E2=100,E3=120,andE4=60respectivelyforeachstep,3)(31desiredSRA24TUFormaximizingtheyieldofS,weshoulduse:CA.Highertemperature;B.Lowertemperature;C.Risingtemperaturewithproceedingofthereaction.15．Foranirreversiblesinglereactionwhoserateequationis–rA=kCAn(n>0),theplugflowreactorisalwayssuperiortothemixedflowreactor.Isthispointofviewright?yes(fill‘yes’or‘no’).Forareactioninseries,iftheintermediateisourdesiredproduct,thentheaboveconclusionisrightornot?yes(fill‘yes’or‘no’).16．SeeFigure1,anaqueousreactantstreampassesthroughthetwo-reactorsetupsconnectedinseriesshownascase(a)and(b):Figure1Ifeachunithavethesamespacetimeandisoper...