NiMo和CoMoP2fTiO_2c2_-Al_2c2_O_2c3_催化剂上焦化粗苯的两段加氢精制

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1、浙江工业大学硕士学位论文n(Co)／n(Co+Mo)=O．324，NiO、CoO、M003和P205的质量分数分别为2％、2％、8％和1％；使用以上两种催化剂时，粗苯两段加氢精制最优工艺条件为：预加氢温度190。C～230"C，主加氢温度310℃～360℃，反应压力2．0MPa～3．5MPa，液体空速2．Oh-1-3．5h一，氢油体积比350～800；在该反应条件下加氢液体产品中噻吩硫含量为零，苯、甲苯、二甲苯(BTX)总收率保持在99％以上；并且以上两段加氢催化剂在160h的寿命试验中表现出良好的稳定性。H2．TPR结果表明，Ti02的加入能够提高催化剂的还原

2、性能，使可还原的八面体Mo物种的量增多，从而提高催化剂的加氢脱硫活性；添加适量的P能减弱载体与Mo活性组分的相互作用，使低温可还原的八面体Mo物种的量增多，从而使催化剂的脱硫活性增加；过量P的加入则会导致催化剂活性下降。关键词：焦化粗苯，加氢精制，NiMo／Ti02．A1203，CoMoP／Ti02．A1203II浙江工业大学硕士学位论文HYDRoREFININGOFCOKINGCRUDEBENZOLOVERNiMoANDCoMoP／Ti02-A1203CATALYSTSABSTRACTCokingcrudebenzeneisthebyproductofcoki

3、ngindustry,thecompositionofwhichisverycomplicated，andthecontentofbenzene，toluene，xylenecanevenreach90percent．CrudebenzeneCan’tbedirectlyusedintheproductionofchemicalproductsuntilitisrefinedfirstlytoremoveimpurities，especiallythehighcontentofthiophene．Astheenvironmentprotectionismorev

4、aluedtoday,therefmingmethodofcrudebenzeneistransformedfromthetraditionalsulfuracidwashingtechnologytocatalytichydrorefiningtechnology．Amongthesehydrorefiningmethods，thelowtemperaturehydrorefiningprocess，withlowinvestment，simpleoperationandpossibilitytobelocalization，ismuchmoresuitabl

5、eforourcountry．Manyplantsforhydrorefiningcrudebenzeneisbeingbuilttheseyears，SOtostudyanddevelopOurownhydrorefmingcatalystsisbecomingmoreimportant．Zi02一A1203compositeoxidewasselectedasthesupportbycomparisonwithotherAlE03supports．NiMo／Ti02-A1203andCoMoP／Ti02一A1203catalystswgrepreparedb

6、ymulti—stepimpregnationmethod．TheeffectsofNi(Co)／Momoleratioandphosphoruscontentonperformancesofthesecatalystsforhydrorefmingofeokingcrudebenzolwereevaluatedinafixed--bedmicroreactor,andreactionconditionsfortwo-·stagehydrorefiningprocessofcokingcrudebenzolwerealsodetermined．2Ni8Mo／Ti

7、02·-A1203and2C08Mo1P／Ti02·-A1203werefoundaSthetwobestcatalystsforpre—hydrogenationandmainhydrogenationreactionofcokingcrudebenzol，forwhichmoleratioofNito(Ni+Mo)andCoto(Co+Mo)were0．325and0．324，andmassfractionsofNiO，CoO，M003and1'205were2％，2％，8％and1％，respectively．Thiophenicsulfurcontent

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