白音华褐煤可溶有机质的组成和结构特征

发布时间：2018-04-24 15:44

本文选题：褐煤 + 分级萃取　；参考：《燃料化学学报》2017年01期

【摘要】：依次采用石油醚、环己烷、二硫化碳、丙酮、甲醇和等体积的丙酮/二硫化碳混合溶剂对白音华褐煤(BL)进行分级萃取得到萃取物(E_1-E_6),利用甲醇、甲苯和等体积的甲醇/甲苯混合溶剂对萃取残渣进行连续热溶得到热溶物(SP_1-SP_3)。利用傅里叶变换红外光谱(FT-IR)、气相色谱质谱(GC/MS)和实时直接分析-质谱(DART-MS)对萃取物和热溶物的组成和结构特征进行了分析。BL总的萃取物产率和热溶物产率分别为9.37%和21.84%。E_5和E_6的FT-IR谱图中有较强的羟基吸收峰,而E_1的FT-IR谱图中脂肪C-H的伸缩振动峰强度明显高于其他萃取物;三种溶剂热溶物的FT-IR谱图相似,但SP_1和SP_3的FT-IR谱图中羟基吸收峰较强。E_1和E_5中GC/MS可检测化合物分别以烷烃和芳烃为主,E_5中还含有较多的含氧化合物;三种热溶物中化合物均以烷烃和芳烃为主,SP_3中酚类、酮类和酯类等含氧化合物的含量较高。DART-MS可检测出萃取物和热溶物中GC/MS无法检测出的较强极性和难挥发化合物;热溶物中含量较高的化合物的碳数和等价双键数(Double bond equivalent,DBE)分别集中分布在10-25和2-16,并且DBE随碳数增加而增加。
[Abstract]:In turn, petroleum ether, cyclohexane, carbon disulfide, acetone, methanol and the same volume of acetone / carbon disulfide mixed solvent were used to extract Bayinhua lignite BLL by stages. The solvent mixture of toluene and methanol / toluene of equal volume was used for continuous thermal dissolution of the extracted residue to obtain the thermal solute SPSP _ 1-SPSP _ (3). The composition and structure of extraction and thermal solute were analyzed by Fourier transform infrared spectroscopy (FTIR), gas chromatography-mass spectrometry (GC / MS) and real-time direct analysis-mass spectrometry (DART-MS). The total extraction yield and thermal solution yield of .BL were 9.37% and 9.37%, respectively. There are strong hydroxyl absorption peaks in the FT-IR spectra of 21.84%.E_5 and E _ s _ 6. However, the stretching vibration peak strength of C-H in fat was significantly higher than that of other extracts in the FT-IR spectra of ESP 1, and the FT-IR spectra of the three solvothermal solutes were similar. However, in the FT-IR spectra of SP_1 and SP_3, the hydroxyl absorption peaks were stronger. The GC/MS in Estu1 and E5 could be detected by alkanes and aromatics respectively. The compounds in the three thermal solutes were alkanes and aromatics, and the phenols in SP3 were mainly alkanes and aromatics, respectively. The contents of oxygenated compounds such as ketones and esters were higher. DART-MS could detect the strong polarity and non-volatile compounds that could not be detected by GC/MS in the extracts and thermal solutes. The carbon number and the equivalent double bond equivalentent number of the compounds with higher content in the thermal solute are concentrated in 10-25 and 2-16, respectively, and the DBE increases with the increase of the carbon number.
【作者单位】：中国矿业大学煤炭加工与高效利用教育部重点实验室;太原理工大学煤科学与技术省部共建国家重点实验室培育基地;
【基金】：国家自然科学基金(21206188) 中央高校基本科研业务费(中国矿业大学,2015QNA25) 煤科学与技术省部共建国家重点实验室培育基地开放课题(MKX201502) 江苏省高校优势学科项目资助~~
【分类号】：TQ530;O657.63

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