燃料化学学报
燃料化學學報
연료화학학보
Journal of Fuel Chemistry and Technology
2015年
10期
1158-1166
,共9页
王擎%许祥成%迟铭书%张宏喜%崔达%柏静儒
王擎%許祥成%遲銘書%張宏喜%崔達%柏靜儒
왕경%허상성%지명서%장굉희%최체%백정유
干酪根%红外光谱%脂肪烃%热解机理%化学结构
榦酪根%紅外光譜%脂肪烴%熱解機理%化學結構
간락근%홍외광보%지방경%열해궤리%화학결구
shale kerogen%FT-IR spectroscopy%aliphatic hydrocarbon%pyrolysis mechanism%chemical structure
对五种不同地区油页岩中干酪根进行了固体KBr压片红外吸收光谱分析,并通过曲线分峰拟合建立了干酪根中脂肪烃区域结构参数的定量测定方法。利用TG-FTIR联用分析技术对干酪根在20℃/min升温速率下热解挥发分析出组分在线定性分析,得到了脂肪烃结构参数随热裂解过程的反应特性及变化规律。研究表明,油页岩中干酪根由脂肪烃结构、芳香烃结构和含氧等官能团三部分组成。脂肪烃结构相对含量为18.5%~78.2%,并均以含长链亚甲基结构为主。随着演化程度的加深,干酪根中脂肪烃含量逐渐减少,生油能力也不断降低。干酪根热分解主要发生在350~520℃,520℃后热失重现象趋于平缓,在此温度下各样品残余半焦的质量分数为19.5%~52.2%。在线红外分析结果表明,干酪根热裂解过程中先析出游离水,随后发生解聚和脱水反应,主要的烷基侧链不断脱落、环化及含氧基团逐渐断裂生成各种烷烃类、羧酸类、醇类和醛类等物质,直至形成更加稳定的类石墨态结构。
對五種不同地區油頁巖中榦酪根進行瞭固體KBr壓片紅外吸收光譜分析,併通過麯線分峰擬閤建立瞭榦酪根中脂肪烴區域結構參數的定量測定方法。利用TG-FTIR聯用分析技術對榦酪根在20℃/min升溫速率下熱解揮髮分析齣組分在線定性分析,得到瞭脂肪烴結構參數隨熱裂解過程的反應特性及變化規律。研究錶明,油頁巖中榦酪根由脂肪烴結構、芳香烴結構和含氧等官能糰三部分組成。脂肪烴結構相對含量為18.5%~78.2%,併均以含長鏈亞甲基結構為主。隨著縯化程度的加深,榦酪根中脂肪烴含量逐漸減少,生油能力也不斷降低。榦酪根熱分解主要髮生在350~520℃,520℃後熱失重現象趨于平緩,在此溫度下各樣品殘餘半焦的質量分數為19.5%~52.2%。在線紅外分析結果錶明,榦酪根熱裂解過程中先析齣遊離水,隨後髮生解聚和脫水反應,主要的烷基側鏈不斷脫落、環化及含氧基糰逐漸斷裂生成各種烷烴類、羧痠類、醇類和醛類等物質,直至形成更加穩定的類石墨態結構。
대오충불동지구유혈암중간락근진행료고체KBr압편홍외흡수광보분석,병통과곡선분봉의합건립료간락근중지방경구역결구삼수적정량측정방법。이용TG-FTIR련용분석기술대간락근재20℃/min승온속솔하열해휘발분석출조분재선정성분석,득도료지방경결구삼수수열렬해과정적반응특성급변화규률。연구표명,유혈암중간락근유지방경결구、방향경결구화함양등관능단삼부분조성。지방경결구상대함량위18.5%~78.2%,병균이함장련아갑기결구위주。수착연화정도적가심,간락근중지방경함량축점감소,생유능력야불단강저。간락근열분해주요발생재350~520℃,520℃후열실중현상추우평완,재차온도하각양품잔여반초적질량분수위19.5%~52.2%。재선홍외분석결과표명,간락근열렬해과정중선석출유리수,수후발생해취화탈수반응,주요적완기측련불단탈락、배화급함양기단축점단렬생성각충완경류、최산류、순류화철류등물질,직지형성경가은정적류석묵태결구。
Five oil shale kerogens from different regions were analyzed by KBr-FTIR spectra, and a quantitative determination method of structural parameters of kerogen aliphatic hydrocarbon was established by peak-fitting analysis. Thermogravimetric ( TG) and Fourier transform infrared spectroscopy ( FT-IR) analysis was used to online analyze devolatilization components of kerogen pyrolyzed at 20℃/min. The reactivity characteristic and variation of structural parameters of aliphatic hydrocarbon with pyrolysis time were obtained. The results show that the oil shale kerogen was composed of aliphatic hydrocarbon, aromatic hydrocarbon and oxygen functional groups. The relative content of aliphatic hydrocarbon structure, mainly long chain methylene, reaches 18. 5% ~78. 2%. With increasing degree of kerogen evolution, the content of aliphatic hydrocarbon and capacity of oil generation decrease. The decomposition of kerogen mainly occurs during 350~520℃. The thermal weightless is mild when above 520 ℃ at which mass fraction of the residual char is 19 . 5% ~52 . 2%. FT-IR analysis shows that free water releases out firstly during pyrolysis, subsequently depolymerization and dehydration reactions occur, and in which main side chains of alkane fall off and cyclization and oxygen-containing groups break into various of hydrocarbons, acids, alcohols, aldehydes, etc. until more stable graphite-like structure is formed.