Study on the thermal extraction of Xianfeng lignite in ionic liquid 1-butyl-3-methyl-imidazolium trifluoromethanesulfonate
-
摘要: 考察了先锋褐煤(XL)在高温稳定性很好的离子液体1-丁基-3-甲基咪唑三氟甲磺酸盐([Bmim]OTf)中的解聚性能,并对其在不同热溶条件下解聚所得热溶物和残煤进行了分析表征。结果表明,[Bmim]OTf对XL具有较好的解聚性能。在280℃,[Bmim]OTf/XL为3.5下解聚4h,[Bmim]OTf对XL的萃取率(以四氢呋喃可溶物计)为20.1%。四氢萘(THN)、H2和催化剂ZnCl2的加入可显著促进XL在[Bmim]OTf中的解聚,相比于XL在[Bmim]OTf作用下的萃取率,THN、H2和催化剂ZnCl2的加入使可溶物的收率分别提高到30.0%、36.9%和46.8%。产物分析结果表明,在[Bmim]OTf热溶解聚XL的过程中THN的加入使得XL经离子液体[Bmim]OTf解聚所得热溶物中氢键的数量明显增加;H2和ZnCl2的添加分别增加了产物中脂肪烃和芳烃的含量。Abstract: The depolymerization behaviors of Xianfeng lignite (XL) in ionic liquid 1-butyl-3-methyl-imidazolium trifluoromethanesulfonate ([Bmim]OTf) were studied in this paper. Also, the thermal extracts and residues obtained from thermal depolymerization of XL at different extraction conditions were analyzed. It was found that [Bmim]OTf had good performance in the depolymerization of XL when the extraction was carried out at 280℃ for 4h with [Bmim]OTf/XL at 3.5. The extraction yield of XL with [Bmim]OTf defined as tetrahydrofuran solubles (THFS) reached to 20.1%. The depolymerization of XL with [Bmim]OTf was promoted markedly with the addition of tetralin (THN), H2 and ZnCl2 catalyst, and the yield of THFS reached to 30.0%, 36.9% and 46.8%, respectively. The results showed that the amount of hydrogen bonds in thermal extracts increased significantly with the addition of THN. The contents of aromatics and aliphatic hydrocarbon were enhanced greatly under the existence of H2 and ZnCl2.
-
Key words:
- lignite /
- ionic liquid /
- depolymerization
-
PAINTER P, PULATI N, CETINER R. Dissolution and dispersion of coal in ionic liquids[J]. Energy Fuels, 2010, 24: 1848-1853. LEI Z P, WU L, ZHANG Y Q, SHUI H F, WANG Z C, PAN C X. Microwave-assisted extraction of Xianfeng lignite in 1-butyl-3-methyl-imidazolium chloride[J]. Fuel, 2012, 95: 630-633. LEI Z P, WU L, ZHANG Y Q, SHUI H F, WANG Z C, REN S B. Effect of noncovalent bonds on the successive sequential extraction of Xianfeng lignite[J]. Fuel Process Technol, 2013, 111: 118-122. LEI Z P, ZHANG Y Q, WU L, SHUI H F, WANG Z C, REN S B. The dissolution of lignite in ionic liquids[J]. RSC Adv, 2013, 3: 2385-2389. LEI Z P, CHENG L L, ZHANG S F, ZHANG Y Q, SHUI H F, REN S B, WANG Z C. Dissolution performance of coals in ionic liquid 1-butyl-3-methyl-imidazolium chloride[J]. Fuel Process Technol, 2015, 111: 222-226. SHUI H F , ZHOU Y, LI H P , WANG Z C, LEI Z P, REN S B, PAN C X , WANG W W. Thermal dissolution of Shenfu coal in different solvents[J]. Fuel, 2013, 108: 385-390. OKUYAMA N, KOMATSU N, SHIGEHISA T. Hyper-coal process to produce the ash-free coal[J]. Fuel Process Technol, 2004, 85: 947-967. PULATI N, SOBKOWIAK M, MATHEWS J P, PAINTER P. Low-temperature treatment of Illinois No.6 coal in ionic liquids[J]. Energy Fuels, 2012, 26(6): 3548-3552. 陈茺, 许学敏, 高晋生, 颜涌捷, 李伟, 郭新闻. 煤中氢键类型的研究[J]. 燃料化学学报, 1998, 26(2): 140-144.(CHEN Chong, XU Xue-min, GAO Jin-sheng, YAN Yong-jie, LI Wei, GUO Xin-wen. Type of hydrogen bonds in coal[J]. J Fuel Chem Technol, 1998, 26(2): 140-144.) IBARRA J V, MUÑOZ E, MOLINER R. FTIR study of the evolution of coal structure during the coalification process[J]. Org Geochem, 1996, 24(6/7): 725-735. -
点击查看大图
计量
- 文章访问数: 575
- HTML全文浏览量: 9
- PDF下载量: 423
- 被引次数: 0
下载:
