2014-2015北京化工大学化学反应工程(全英文)期中考试

第1页北京化工大学2014——2015学年第一学期《CHEMICALREACTIONENGINEERING》期中考试试卷课程代码CHE32502T班级：姓名：学号：分数：题号1234567总分得分1.Choosethemostsuitableonefromthefouranswers(5pointsforeachone,25pointsintotal)(1)Areactionconversionreaches30%att=10minand45%att=15min,thereactionmaybe()A.Zero-orderreactionB.First-orderreactionC.Second-orderreactionD.Third-orderreaction(2)ThefirstorderreactionsinseriesSRAkk21proceedinanidealreactor.WhichoneofthefollowingfourconditionsmakesthefractionalyieldofproductRmaximum?()A.k1/k2=1,batchreactorB.k1/k2=10,batchreactorC.k1/k2=1,mixedflowreactorD.k1/k2=10,mixedflowreactor(3)If-rA=-(dCA/dt）=0.1mol/liter·secwhenCA=1mol/liter,whatistherateofreactionwhenCA=10mol/liter?Note:theorderofreactionisnotknow.()A.0.1mol/liter·secB.0.5mol/liter·secC.1mol/liter·secD.Notknow(4)GaseousreactionA→3Risallowedtoproceedtocompletion,equalmolarAandinertspresentatthestart,whatisthevalueofexpansionfactorε?()A.1B.2C.3D.4(5)Thesecondorderreactionsinseries121200HHttARS△△proceedinaplugreactor.WhichoneofthefollowingfourconditionsmakestheconcentrationofproductRmaximum?()C.t1=500°C;t2=300°CB.t1=300°C;t2=300°CC.t1=300°C;t2=500°CD.t1=500°C;t2=500°C2.Writeyouranswersintheblanks(5pointsforeachone,20pointsintotal)(1)LiquidA(CA0=1mol/liter)decomposesbysecond-orderkineticsinabatchreactor,50%ofAwillbeconvertedina5-minuterun.Howmuchtimewouldittaketoreach75%conversion?15min(2)Timerequiredtoprocessonereactorvolumeoffeediscalledspacetime(3)Areactionproceedswithanactivationenergyof100kJ/mol.Thereactionrateis1at500°C,thereactionrateis2at536°C.第2页(4)Liquidphasereactionsandareallowedtoproceedtocompletion,anequimolarfeedofCA0=CB0=1mol/literisintroducedintoabatchreactor,thefinalconcentrationsofAandRare0.3mol/liter,0.4mol/liter,respectively,thevalueofk1/k2is1.25Note:youmayusethefollowingfigure.3.AcatalyticreactionC20H42→Risproceedinabatchreactor,thereactorunitcontains100tonsofρ=1000kg/m3porouscatalyst,2820m3ofρ=1000kg/m3reactantsaretreatedperday,if72%ofthereactantsturnintoproducts,whatistherateofreaction,expressedas–r(molsreacted/kgcat·hr)?(8points)3molsreacted/kgcat·hr4.Aliquidreactant(1mol/liter)passesthroughtwomixedflowreactorsinseries.TheconcentrationofAintheexitofthefirstreactoris0.5mol/literand0.2mol/literofthesecondreactorexit.Thereactionisoffirst-orderwithrespecttoA,whatisthevalueofthereactorvolumeratioV2/V1?(10points)1.55.AfirstordergasdecomposesreactionA→2Rproceedsinaplugflowreactorisothermally.Theinletstreamwith60%Aand40%inerts.Thevolumeofoutletstreamis1.2timesasinletoneandthemeanresidencetimeis10sec.PleasefindtheconversionofreactantAandtherateconstantk.(12points)xA=1/3k=0.04sec-1SRBAk1SPBRk2第3页6.QualitativelyfindtheoptimumtemperatureprogressiontomaximizeCSforthereactionschemeData:E1=10,E2=25,E3=15,E4=10,E5=20,E6=25(10points)Low-high-low7.LiquidreactantAdecomposesasfollows:122113121min2min4.0kCkrSAmolmkCkrRAASARAfeedofaqueousA(CA0=10mol·m-3)entersareactor,decomposes,andamixtureofA,R,andSleaves.FindCRandCSandforXA=0.9inaplugflowreactor.(15points)CR=4.42mol/m3CS=4.58mol/m3t=0.693min第4页北京化工大学2014——2015学年第一学期《CHEMICALREACTIONENGINEERING》期中考试试卷答案1(1)A(2)B(3)D(4)A(5)B21.15minutes2.spacetime3.5364.1.253.n=(2820*1000)/0.282=107mol-r=(0.72*107)/(105*24)=3molsreacted/kgcat·hr4.第5页5.1/5.15.18.015.08.00.8For15.015.00.5For1112122A1AAAAA0AA0AAA0VVkkkxkxxxkxkCxCrxC5.6.low-high-low7.1AA0AAAAA0AAAA0AA0Asec0405.0103/11ln1ln1ln13/16.0112.116.06.016.01112xkxtkxrdxCtxxxVVyx第6页min693.0])2.01ln(2.01ln2.01[101)2.0112.01(101)2.01(2.011014.0211142.458.4)110()(58.414.02104.02ln4.02)4.02ln(0.424.0224.0224.024.04.024.0101101101101101210121210130310110121221012122100AAAAAAAAAAAAAAAASAARAAACCASSAAAAASSAAACCARRAAAAAARRCCdCCCdCCCdCCCdCCkCkdCrmmolCCCCmmolCdCCdCCCCkCkCkdCdCdCCCdCCCCCkCkCkdCdCAAAA