简介：TheseparationofxyleneisomersusingGCisamuchdifficulttaskforalongtime,ontheotherhandtheyareveryimpoFtantindustrialmaterials,sofindingagoodstationaryphasehasbeenaninterestingwork.Anexcellentseparationofxyleneisomerswasobtainedbyusing2,6-di-O-pentyl-3-O...

简介：<正>TheDalianInstituteofChemicalPhysicsofCAShasmadegreatstridesinselectiveoxidationstudiesafterhavingperformedsuccessfulcommercialtestingofthenovelcatalystforoxidationofparaxyleneinthe100kt/ascale.

简介：Effectsofhydrochlorideaciddealuminationofmordenite(MOR)catalystsforthesynthesisof1-phenyl-1-xylylethane(PXE)wereinvestigated.ThestructureandacidityofcatalystswerecharacterizedbyXRD,BET,XRF,FT-IR,27AlNMRandNH3-TPDtechniques.Thecatalyticperformanceoftheacid-treatedMORzeoliteswasstudiedthroughusingthealkylationofo-xylenewithstyrene.ThetestresultsshowedthatthestrengthofremainingBr?nstedacidsitesincreaseddespitethereductionoftotalnumberofacidsitesafterdealumination,andthemicroporesofHMORwereslightlyenlargedcoupledwiththeformationofsecondarymesopores.Additionally,themodifiedHMORzeolitesshowedlongercatalystlifewiththestyreneconversionrateretained.Amongthecatalystsemployedinthisstudy,themodifiedmordenitethatwasdealuminatedbyHCl(2mol/L)couldbeusedrepeatedlywithoutsignificantlossofactivityandselectivityduringsixcatalyticruns,whichhavebeenascribedtoitsspecificacidityandstructuralproperties.

简介：Recentlythepilotmoving-bedunitformanufacturingaromaticsfrommethanolandtoluenewithco-productionoflow-carbonolefinsdesignedbytheSinopecEngineeringIncorporation(SEC)hasbeenputonstreamsuccessfully.Inthecourseofcommissioning,thepilotunitransmoothly,leadingtohighconversionrateinthemoving-bedreactor,highyieldofxyleneproduct,easyliftofcatalyst,andgoodcokeburnoutresults,withallindicatorscomplyingwiththeexpectedoperatingrequirements.