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.

简介：经Fischer-Tropsch（FT）合成生产液体燃料正在复出，部分因为它提供一种使天然气货币化的方法，还因为该液体产品具有高辛烷值，很少或不含硫、芳烃和氮。传统的FT催化剂如负载在二氧化硅上的钴（Co／SiO2），一般产生高辛烷值无支链烷烃的液体燃料，它适合于柴油燃料。

简介：HighresolutionmassspectrometryincombinationwithdistillationandSARAfractionationprovidesusanopportunityforin-depthunderstandingaboutthehydrotreatingprocessatthemolecularlevel.Inthisstudy,theatmosphericresiduederivedfromArabianheavycrudeanditshydrotreatedproductswereinitiallysubjectedtodistillationandSARAfractionation.ThesaturateswerecharacterizedbyGCFI/FDTOFMS.ThearomaticsandresinswerecharacterizedbyAPPIFT-ICRMS.Compositionalchangesofdifferentcompounds(paraffins,naphthenes,aromatichydrocarbons,andheteroatomiccompounds)containedindifferentdistillates(vacuumgasoil,vacuumresidue)wereobtained.Moredetailedknowledgeaboutthehydrotreatingprocesswasachieved.