化学反应工程作业Word格式.docx
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化学反应工程作业Word格式.docx
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Usedbygraduatestudentsof2010
2011-6
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1:
Foragasreactionat400Ktherateisreportedas
(a)Whataretheunitsoftherateconstant?
(b)Whatisthevalueoftherateconstantforthisreactioniftherateequationisexpressedas
2:
Fortheelementaryreactionsinseries
findthemaximumconcentrationofRandwhenitisreached.
3:
Givenagaseousfeed,T0=1000K,π0=5atm,CA0=100,CB0=200,
T=400K,π=4atm,CA=20.FindXA,XB,CB.
4:
AgaseousfeedofpureA(1mol/liter)entersamixedflowreactor(2liters)andreactsasfollows:
Findwhatfeedrate(liter/min)willgiveanoutletconcentrationCA=0.5mol/lliter.
5:
Thekineticsoftheaqueous-phasedecompositionofAisinvestigatedintwomixedflowreactorsinseries,thesecondhavingtwicethevolumeofthefirstreactor.Atsteadystatewithafeedconcentrationof1molA/literandmeanresidencetimeof96secinthefirstreactor,theconcentrationinthefirstreactoris0.5molA/literandinthesecondis0.25molA/liter.
Findthekineticequationforthedecomposition.
6:
TisthedesiredproductandCA0=5.
Underultravioletradiation,reactantAofCA0=10kmol/m3inaprocessstream(v=lm3/min)decomposesasfollows.
Wewishtodesignareactorsetupforaspecificduty.Sketchtheschemeselected,andcalculatethefractionoffeedtransformedintodesiredproductaswellasthevolumeofreactorneeded.
7:
Whenoxygenisbubbledthroughahigh-temperaturebatchofA-containingliquidmaterial,AoxidizesslowlytogiveaslowlydecomposingintermediateXandfinalproductR.Herearetheresultsofanexperiment:
WehavenowayofanalyzingforX;
however,wearesafeinassumingthatatanytimeCA+CR+CX=CA0.Whatcanwesayaboutthemechanismandkineticsofthisoxidation?
Hint:
plotthedataandexaminetheplot.
8:
PhthalicAnhydridefromNaphthalene.Theacceptedmechanismforthehighlyexothermicsolidcatalyzedoxidationofnaphthalenetoproducephthalicanhydrideis
andwhere
A=naphthalene(reactant)
R=naphthaquinone(postulatedintermediate)
S=phthalicanhydride(desiredproduct)
T=CO2+H2O(wasteproducts)
andtheArrenhiusactivationenergyisgiveninunitsofJ/mol.Thisreactionistoberunsomewherebetween900Kand1200K.
Alocaloptimumreactorsetupdiscoveredbythecomputer[seeexample
1,Chem.Eng.Sci.,49,1037-1051(1994)lisshowninFig.P10.19.
FigureP10.19
(a)Doyoulikethisdesign?
Couldyoudobetter?
Ifso,how?
(b)Ifyoucouldkeepthewholeofyourreactorsatwhatevertemperatureand7valuedesired,andifrecyleisallowed,howmuchphthalicanhydridecouldbeproducedpermoleofnaphthalenereacted?
Suggestion:
Whynotdeterminethevaluesofk1,k2,k3,andk4,forbothextremesoftemperature,lookatthevalues,andthenproceedwiththesolution?
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