先锋褐煤在离子液体1-丁基-3-甲基咪唑三氟甲磺酸盐作用下热溶解聚及其产物分析

Study on the thermal extraction of Xianfeng lignite in ionic liquid 1-butyl-3-methyl-imidazolium trifluoromethanesulfonate

    摘要
  • 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(BmimOTf)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,BmimOTf对XL具有较好的解聚性能。在280℃,BmimOTf/XL为3.5下解聚4h,BmimOTf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BmimOTf中的解聚,相比于XL在BmimOTf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BmimOTf热溶解聚XL的过程中THN的加入使得XL经离子液体BmimOTf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 (BmimOTf) 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 BmimOTf had good performance in the depolymerization of XL when the extraction was carried out at 280℃ for 4h with BmimOTf/XL at 3.5. The extraction yield of XL with BmimOTf defined as tetrahydrofuran solubles (THFS) reached to 20.1%. The depolymerization of XL with BmimOTf 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.

     

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