化学反应工程作业.docx

化学反应工程作业.docx

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化学反应工程作业

TheFinalExaminationof

ChemicalReactionEngineering

Usedbygraduatestudentsof2010

2011-6

Name:

Class:

Grade:

StudentNumber:

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?