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阔叶材(山杨和速生杨)漂白浆和未漂浆水解降解及其产物性质的研究(英文).docx

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阔叶材(山杨和速生杨)漂白浆和未漂浆水解降解及其产物性质的研究(英文) ResearchontheHydrolysisDegradationandProductPropertiesofBleachedandUnbleachedBroadleafWood(PopulusdavidianaandPopulussimonii) Introduction: Broadleafwood,suchasPopulusdavidianaandPopulussimonii,isanimportantrawmaterialfortheproductionofpaper,wood-basedpanelsandbiofuels.Inthemanufacturingprocess,woodchipsaretreatedwithaseriesofchemicalandmechanicalprocesses,includingbleaching,whichisanimportantsteptoachievewhitenessandbrightnessofthefinalproduct.However,thebleachingprocessmayaffectthechemicalcompositionandstructureofthewood,whichcaninfluenceitsbiodegradabilityandproductproperties.Thisstudyaimstoinvestigatethehydrolysisdegradationandproductpropertiesofbleachedandunbleachedbroadleafwood. MaterialsandMethods: RawmaterialsofPopulusdavidianaandPopulussimoniiwerecollectedandchippedintosmallpieces.Theunbleachedandbleachedwoodchipswerethenhydrolyzedwithdilutesulfuricacidat180°Cfor60min.Thechemicalcompositionofthewoodsamplesbeforeandafterhydrolysiswasanalyzedusinggaschromatography-massspectrometry(GC-MS)andFouriertransforminfraredspectroscopy(FTIR).Thesugaryieldandproductdistributionwerealsoquantifiedusinghigh-performanceliquidchromatography(HPLC)andgaschromatography(GC). Results: TheFTIRspectraoftheunbleachedPopulusdavidianaandPopulussimoniiwoodchipsshowedcharacteristicpeaksoflignin,hemicelluloseandcellulose.Afterbleaching,theintensityofthehemicellulosepeakdecreasedsignificantly,indicatingthatthebleachingprocesshadremovedalargeamountofhemicellulosefromthewood.TheGC-MSanalysisshowedthattheunbleachedwoodsamplescontainedmorehemicelluloseandlignin-derivedcompounds,whilethebleachedwoodsampleshadahigherproportionofcellulose-derivedcompounds.ThesugaryieldoftheunbleachedPopulusdavidianaandPopulussimoniiwoodchipswashigherthanthatofthebleachedwoodchips,withxylosebeingthemostabundantsugarinbothsamples.Theproductdistributionanalysisshowedthattheunbleachedwoodchipsproducedmorefurfural,levulinicacidandformicacid,whilethebleachedwoodchipsproducedmoregluc