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1、CorrespondingSolutionsforChemicalReactionEngineeringCHAPTER1OVERVIEWOFCHEMICALREACTIONENGINEERING.1CHAPTER2KINETICSOFHOMOGENEOUSREACTIONS.3CHAPTER3INTERPRETATIONOFBATCHREACTORDATA.7CHAPTER4INTRODUCTIONTOREACTORDESIGN.19CHAPTER5IDEALREACTORFORASINGLEREACTOR.22CHAPTER6DESIGNFORSINGLEREACTIONS.26CHAPTE
2、R10CHOOSINGTHERIGHTKINDOFREACTOR.32CHAPTER11BASICSOFNON-IDEALFLOW.34CHAPTER18SOLIDCATALYZEDREACTIONS.431Chapter1OverviewofChemicalReactionEngineering1.1Municipalwastewatertreatmentplant.Consideramunicipalwatertreatmentplantforasmallcommunity(Fig.P1.1).Wastewater32000m3dayflowsthroughthetreatmentplan
3、twithameanresidencetimeof8hrairisbubbledthroughthetanksandmicrobesinthetankattackandbreakdowntheorganicmaterial(organicwaste)+O2CO2+H2OmicrobesAtypicalenteringfeedhasaBOD(biologicaloxygendemand)of200mgO2literwhiletheeffluenthasamegligibleBOD.FindtherateofreactionordecreaseinBODinthetreatmenttanks.Wa
4、stewater32000m3dayWastewaterTreatmentplantCleanwater32000m3day200mgO2neededliterMeanresidencetime=8hrtZeroO2neededFigureP1.1Solution:)(1017.2)(75.183132100010001)0200()(313200031320001343333smmoldaymmoldaymolgmLmggLmgdaydaymdaydaymVdtdNrAA1.2Coalburningelectricalpowerstation.Largecentralpowerstation
5、s(about1000MWelectrical)usingfluidingbedcombustorsmaybebuiltsomeday(seeFig.P1.2).Thesegiantswouldbefed240tonsofcoalhr(90%C10%H2)50%ofwhichwouldburnwithinthebatteryofprimaryfluidizedbedstheother50%elsewhereinthesystem.Onesuggesteddesignwoulduseabatteryof10fluidizedbedseach20mlong4mwideandcontainingso
6、lidstoadepthof1m.Findtherateofreactionwithinthebedsbasedontheoxygenused.2Solution:380010)1420(mV)(9000101089.05.01024033hrbedmolchrkgckgcoalkgchrcoaltNc)(25.111900080011322hrmkmolOtNVrrccO)(12000412000190002hrbedmoldtdO)(17.4800)(105.113422smmolhrbedmoldtdOVrO3Chapter2KineticsofHomogeneousReactions2
7、.1AreactionhasthestoichiometricequationA+B=2R.WhatistheorderofreactionSolution:Becausewedontknowwhetheritisanelementaryreactionornotwecanttelltheindexofthereaction.2.2Giventhereaction2NO2+12O2=N2O5whatistherelationbetweentheratesofationanddisappearanceofthethreereactioncomponentsSolution:522224ONONO
8、rrr2.3Areactionwithstoichiometricequation0.5A+B=R+0.5Shasthefollowingrateexpression-rA=2C0.5ACBWhatistherateexpressionforthisreactionifthestoichiometricequationiswrittenasA+2B=2R+SSolution:Nochange.Thestoichiometricequationcanteffecttherateequationsoitdoesntchange.2.4Fortheenzyme-substratereactionof
9、Example2therateofdisappearanceofsubstrateisgivenby-rA=molm3sA061760CEAWhataretheunitsofthetwoconstantsSolution:603AACEAksmmolr36mmolCAsmmolmmolmmolsmmolk1)(33332.5ForthecomplexreactionwithstoichiometryA+3B2R+Sandwithsecond-orderrateexpression-rA=k1AB4arethereactionratesrelatedasfollows:rA=rB=rRIfthe
10、ratesarenotsorelatedthenhowaretheyrelatedPleaseaccountforthesings+or-.Solution:RBArrr21312.6Acertainreactionhasarategivenby-rA=0.005C2Amolcm3minIftheconcentrationistobeexpressedinmolliterandtimeinhourswhatwouldbethueandunitsoftherateconstantSolution:min)()(3cmmolrhrLmolrAA22443300005.0106610)(minAAA
11、AACCrrcmmolmolhrLrAAAAACCcmmolmolLCcmmolCLmolC33310)()(24232103)10(300300)(AAAACCCr4103k2.7Foragasreactionat400Ktherateisreportedas-=3.66p2AatmhrdtdpA(a)Whataretheunitsoftherateconstant(b)Whatisthueoftherateconstantforthisreactioniftherateequationisexpressedas-rA=-=kC2Amolm3sdtdNVA1Solution:(a)Theun
12、itoftherateconstantis1hratm(b)dtdNVrAA1BecauseitsagasreactionoccuringatthefinedterperatusesoV=constantandT=constantsotheequationcanbereducedto522)(66.366.3)(1RTCRTPRTdtdPRTdtdPVRTVrAAAAA22)66.3(AAkCCRTSowecangetthatthueof1.12040008205.066.366.3RTk2.9Thepyrolysisofethaneproceedswithanactivationenergy
13、ofabout300kJmol.Howmuchfasterthedecompositionat650thanat500Solution:586.7)92311731()10(314.8300)11(3211212KKKmolkJmolkJTTREkkLnrrLn7.197012rr2.11Inthemid-nineteenthcenturytheentomologistHenriFabrenotedthatFrenchants(gardenvariety)busilybustledabouttheirbusinessonhotdaysbutwererathersluggishoncooldays.CheckinghisresultswithOregonantsIfindRunningspeedmhr150160230295370Temperature1316222428WhatactivationenergyrepresentsthischangeinbustlinessSolution:RTERTERTEekeaktconsionconcentratfletionconcentratfekr00tan)()(RETLnkLnrA1SupposeTxLn
