简介：ThreedifferenttypesofVGOwereselectedandcutintovariousdistillatesbytrueboiling-pointdistillation(TBD),andthedistillateswerefurtherseparatedintodifferentcomponents(saturates,aromaticsandresins)viasolidphaseextraction(SPE).Thehydrocarboncomponentsinsaturatesandaromaticswerecharacterizedonthequasi-molecularlevelbyGC/MSandGC/TOFMS.CrackingreactionsofVGO,theirdistillates,andhydrocarboncomponents(saturatesandaromatics)wereperformedonanACE(modelAP)unit.Ninecorrelationparameters(mainlybasedonthepreviousassumptionofbasicstructureunits,BSU)whichcouldbetterreflectthestructuresandcompositionsofhydrocarbonswereputforwardbasedonthequasi-molecularlevelanalysisdata,andcorrelatedwithFCCproductdistributionbymulti-regressionmethod.Aseriesofcorrelationformulaswereobtained.TheformulaswerefurtherverifiedbycomparingexperimentalandcalculatedFCCyieldsemanatedfromtwootherVGOfeedstocks.

简介：ThemoleculartransformationsofcarboxylicacidsinheavyacidicSLcrudebeforeandaftertrueboilingpointdistillationwereexaminedbyultra-highresolutionnegative-ionelectrosprayionization(ESI)Fouriertransformioncyclotronresonancemassspectrometry(FT-ICRMS).Theacidclass(heteroatomnumber),type(znumbers)andcarbonnumberdistributionswerepositivelycharacterized.Itwasfoundoutthatthetotalacidnumber(TAN)ofSLcrudedecreasedaftertrueboilingpointdistillation,andtheabundanceofO2classinmassspectrawasalsofoundtobereducedfrom67.6%to34.5%inSLTBPmixedcrudeasmeasuredbyMSspectra,indicatingtoapotentialcarboxylicaciddecomposition.However,itwasinterestingthatthecarboxylicacidstypedistributioninbothoilswasalmostthesamealthoughtheirrelativeabundanceinSLTBPmixedcrudeturnedtobemuchlower,suggestingthatvariouspetroleumcarboxylicacidtypeshavethesimilarthermaldecompositionreactionbehavior.Furthermore,foreachO2typeofacidsinSLTBPmixedcrude,theabundanceofcarboxylicacidswithcarbonnumberhigherthan35wasreducedgreatly,especiallyforthosewithcarbonnumberhigherthan60,themasspeaksofwhichwerenearlytotallyremoved,indicatingthatthelargecarboxylicacidmoleculesinheavyfractionsdecomposedmoresignificantlybecauseoflongerheatingtimeduringthetrueboilingpointdistillationprocess.Asaresult,thereductionofTANmaybecausedbythethermaldecompositionofcarboxylicacidsespeciallythosewithhighcarbonnumber,suggestingthatquickdistillationormuchlowerpressureisrequiredtoavoidthethermaldecomposition.