Citation: HU Zhi-quan, ZHANG Su-fang, LEI Zhi-ping, SHUI Heng-fu, WANG Zhi-cai, REN Shi-biao. Study on the thermal extraction of Xianfeng lignite in ionic liquid 1-butyl-3-methyl-imidazolium trifluoromethanesulfonate[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(5): 513-518. shu

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

1.
School of Chemistry & Chemical Engineering, Anhui Key laboratory of Coal Clean Conversion & Utilization, Anhui University of Technology, Ma'anshan 243002, China

Corresponding author: LEI Zhi-ping, SHUI Heng-fu,
Received Date: 20 November 2014

Fund Project: 国家重点基础研究发展规划(973计划, 2011CB201300) (973计划, 2011CB201300) 国家自然科学基金(21476002, 21476003, 21476004, 21176001, U1361125) (21476002, 21476003, 21476004, 21176001, U1361125) 国家自然科学基金与神华联合基金重点项目(U1261208) (U1261208) 中日国际合作项目(2013DFG60060) (2013DFG60060)

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 4h 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.
- lignite,
- ionic liquid,
- depolymerization
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