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1、第65卷第9期化工學(xué)報、幻1.65No.92014年9月CIESCJournalSeptember2014木質(zhì)素結(jié)構(gòu)及熱解特性陳磊,陳漢平,陸強(qiáng),宋揚(yáng),丁學(xué)杰,王賢華,楊海平(。華中科技大學(xué)煤燃燒國家重點(diǎn)實(shí)驗室,湖北武漢430074;華北電力大學(xué)生物質(zhì)發(fā)電成套設(shè)備國家工程實(shí)驗室,北京102206;3貴州華電畢節(jié)熱電有限公司,貴州畢節(jié)551713)摘要:為研究結(jié)構(gòu)類型和提取方法對木質(zhì)素?zé)峤馓匦缘挠绊?,本研究采用Klason方法預(yù)處理得到的棉桿、核桃殼Klason木質(zhì)素和貝克曼方法預(yù)處理得到的核桃殼磨木木質(zhì)素(MWL),并結(jié)合傅里葉紅外光譜儀(FT-IR)和快速熱解儀.氣相色譜/質(zhì)
2、譜聯(lián)用(ey—GC/MS)對其化學(xué)結(jié)構(gòu)和熱解特性進(jìn)行分析。FT-IR表明堿木質(zhì)素為G型木質(zhì)素,棉桿木質(zhì)素屬于GS類型木質(zhì)素,而核桃殼木質(zhì)素具有HGS木質(zhì)素的特征;Py-GC/MS分析發(fā)現(xiàn)原料的變化以及提取方法對木質(zhì)素?zé)峤猱a(chǎn)物的組成有明顯的影響,在棉桿Klason木質(zhì)素中鄰苯二酚類產(chǎn)物含量為28.18%,而在核桃殼Klason和磨木木質(zhì)素的含量分別為18.12%和35.11%。同時研究表明經(jīng)兩種方法處理的木質(zhì)素結(jié)構(gòu)有明顯的不同,其中Klason木質(zhì)素結(jié)構(gòu)中苯丙酸側(cè)鏈上的d一和.醚鍵明顯斷裂,而貝克曼處理主要體現(xiàn)在苯基芳基醚鍵的斷裂。關(guān)鍵詞:木質(zhì)素;結(jié)構(gòu)分析;快速熱解;熱裂解特性D
3、OI:10.3969~.issn.0438—1157.2014.09.043中圖分類號:TK6文獻(xiàn)標(biāo)志碼:A文章編號:O438—1157(2014)09—3626~08CharacterizationofstructureandpyrolysisbehaviorofligninCHENLei1CHENHanping,LUQiang,SONGYang,DINGXuejie。,WANGXianhua,YANGHaiping7(StateKeyLaboratoryofCoalCombustion,HuazhongUniversityofScience&Technology,Wuhan
4、430074,Hubei,China;NationalEngineeringLaboratoryforBiomassPowerGenerationEquipment,NorthChinaElectricPowerUniversity,Beijing102206,China;HuadianBij'ieThermalPowerCo.,Ltd.,Bij'ie551713,Guizhou,China)Abstract:Theinfluenceofextractionmethodandstructuretypeonthepyrolysisbehaviorofligninwasinvest
5、igated.ThefunctionalgroupsandpyrolysischaracteristicsofKlasonligninextractedfromco~onstalkandwalnutshellbytheKlasonmethod(1abeledasKCSLandKWSL,respectively)andmilledwood1igninextractedfromwalnutshellviatheBi6rkmanmethod(1abeledasBWSL),wereanalyzedwithFouriertransforlTlinfraredspectroscopy(FT
6、IR)andpyrolysis-gaschromatography—massspectrometry(Py—GC/MS).Theresultswerecomparedwithcommercialalkalilignin(CAL).TheFTIRresultsrevealedthatalkalilignin.coRonstalkligninandwalnutshellligninswereTypeGTypeGSandTypeHGS,respectively.ThepyrolysisresultsfromPy—GC/MSsuggestedthattheproductsdistrib
7、utionofvariousligninswereaffetedbymaterialtypeandextractionmethodgreatly.ThecontentsofcatecholderivativesobtainedfromKCSL.KWSLandBWSLwere28.18%.18.12%and35.11%.MeanswhilemodificationofBWSLwasmainlyattributedtothebreakageofbenzylaryletherlinkages.wh