2008_Adsorption Kinetics of Anilines on Macroporous Kaolin(陈航飞）

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1、2188Energy&Fuels2008,22,21882194AdsorptionKineticsofAnilinesonMacroporousKaolinFranciscoLo´pez-Linares,LanteCarbognani,ClementinaSosaStull,andPedroPereira-Almao*SchulichSchoolofEngineering,DepartmentofChemicalandPetroleumEngineering,UniVersityofCalgary,Alber

2、ta,Canada,T2N1N4ReceiVedFebruary5,2008.ReVisedManuscriptReceiVedApril4,2008Macroporouskaolinisstudiedasaconvenientsubstrateforadsorptionofpetroleumheavyendsinrelationtofeasibleupgradingprocesses.Understandingtheparametersthatcontroladsorptionofpolarmolecules

3、overdifferentadsorptionmediaisimportantforprocessoptimization.Intheseregards,adsorptionkineticsofsmallmolecularmassanilines(<205g/mol)overmacroporouskaolinwasstudied.Theresultsindicatethatthedynamicandlevelsofadsorptionofthesemoleculesisnotcontrolledbydiffer

4、encesinmolecularsize.Thenatureofsubstituentsontheanilineringplaysanimportantroleontheadsorption.Theincorporationofoxygenasamethoxygroupintheorthoorparapositionenhancestheadsorption,whiletheincorporationofalkylgroupshasmixedeffectsonthisphenomenon,decreasingt

5、headsorptivitywhenthegroupinplacedintheorthoposition.Thepresenceoftwoaromaticringsattachedtotheanilinemoleculesuchas1-aminoanthraceneincreasestheadsorptionuptake.Moreover,thepresenceofsulfurintheformofmethylthiogroupsreducestheadsorptionparticularlywhenthegr

6、oupislocatedintheorthoposition.Finally,thermodynamicsoftheadsorptionoftheseanilinesovermacroporouskaolinarestudiedandfoundprimarilygovernedbythetypeofsubstituentpresentonthearomaticring.Introductionpaperfilling,ceramics,paintextenders,crackingcatalysts,cement

7、s,dyestuffswastewaters,andpharmaceuticalindustries.710ThevastreservesofbitumenandheavyoilworldwideandKaoliniteisthemajormineralcomponentofkaolin,whichmayparticularlythoselocatedinCanadacontainsignificantlymorecontainsomeimpuritieslikequartz,illites,smectites,

8、andnitrogenandsulfurheteroatomfunctionalitiesthanconventionalfeldspars.Kaoliniteisadoublelayeredclayanddetailsonitscrudeoils.Thesecompoundscanadsorboncatalystsurfaces11,12structurehavebeenreport