Cu--Zn2fAl2O3催化剂上醋酸间接加氢制乙醇本征动力学

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1、2)乙酸乙酯加氢制乙醇本征动力学催化剂的性能测定在等温积分管式反应器中进行，并考察了温度(f)、压力(矽)、乙酸乙酯质量液时空速(LHSV)、氢酯比(以物质的量计)对催化剂性能的影响。单因素法得到的最佳条件是t=210。C、p=3．0MPa、LHSV=1．0g／(g．h)、氢酯tL=30，此时乙酸乙酯转化率达97．3％，乙醇选择性达99．4％。同时在t=-180～2306C，p=1．O～5．0MPa，LHSV-0．7～1．9g／(g．h)，氢酯Ll',=20～50的条件范围内设计了L9(34、)正交试验以获得动力学数据。借助MATLAB软件，以四阶五级龙格．库塔．费尔贝格(Rung

2、e—Kutta-Felhberg)数值积分方法、列文伯格．马夸特(Levenberg-Marquardt)算法拟合出Cu．Zn／A1203催化剂上乙酸乙酯加氢制乙醇的幂律型本征动力学方程。关键词：Cu—Zn／A1203催化剂，乙酸乙酯，加氢，乙醇，本征动力学ABSTRACTINTRINSICKINETICSFoRTHEINDIRECTHYDRoGENATIONOFACETICACIDTOETHANOLoNTHECu-Zn／A1203CATALYSTEthanolisusedasallimportantchemicalmaterialaswellascleanfuelwithhuge

3、consumption．Currently,traditionalmethordsofgrainfermentationandhydrationofethylenearemainlyadoptedtoproduceethan01．Buttheformerprocessconsumesalotofpreciousgrainandthelagerconsumesexpensiveanddepletingoilresources．Currently,coal—basedaceticacidindustryisRappedinanawkwardsituation，namelylowpric

4、e，seriouslyexcessivecapacityandsaturateddownstreamdemand．Thedevelopmentofethanolfromaceticacidcannotonlyutilizeexcessiveaceticacidbutalsocreatehugeeconomicandenvironmentalbenefits．Theprocessofcatalyticallyindirecthydrogenationofaceticacid————esterificationfirstandthenhydrogenationoftheeste卜———

5、．、Ⅳaschosentoproduceethan01．Thedetailsareasfollows：1)CharacterizationoftheCu-Zn／A1203catalystICP(inductivecoupledplasmaemissionspectrometer)，XRD(x—raydiffraction)，BET(specificsurfacearea)，H2一TPR(temperature-programmedIII北京化工大学硕士学位论文reduction)areusedtocharacterizethecatalyst．TheICPresultsshowth

6、atthemainelementofthecatalystisCu，whosemassfractionis53．8％inCuO，thecarrierofA120317．1％andthepromoterofZnO1．6％．XRDpattemshowsthatCuOexistsasamorphoustypeonthecarderwithgooddispersion．TheBETspecificsurfaceareaofthecatalystis87．35m2／g，andtheaverageporediameteris9．43nln．Theproportionofthewell—dist

7、ributedholeswithdiameterof2～lOnmismaximum．HE-TPRindicatesthattheCuelementgoesthroughthestatusofCu2+toCu+toCu0withthereductionofthecatalystandthetemperaturerangeof221--305。Cissuitableforthereduction．2)Theintrinsickineticsofproducingethan