doi:10.16186/j.cnki.1673-9787.2020010027

Received:2020/01/08

Revised:2020/06/04

Published:2021/09/15

Influence of ionic liquids/NMP on the structure and extraction performance of Shuangma s extraction residue

CHENG Xueyun1, LI Mei1,2,3, SUN Gongcheng1, DING Ning1, YUE Jinsong1, XU Rongsheng1

1.School of Chemistry and Chemical Engineering， North Minzu University， Yinchuan  750021 ， Ningxia ， China;2.Ningxia Key Laboratory of Solar Chemical Conversion Technology， North Minzu University， Yinchuan  750021 ， Ningxia ， China;3.Key Laboratory for Chemical Engineering and Technology， State Ethnic Affairs Commission， North Minzu University， Yinchuan  750021 ， Ningxia ， China

Abstract:Abstract：In order to study the Influence of ionic liquids/NMP on the structure and extraction performance of Shuangma 's extraction residue ， the Ningdong Shuangma coal（ SM ） was fractional extracted with ethanol and acetone to obtain residue coal（SMEC） ， and then the SMEC was extracted by mixed solvent of different types of ionic liquids（ lLs ） and N-methylpyrrolidone（ NMP）. The changes of thermal decomposition characteristics of coal samples before and after extraction by ILs/NMP were studied through TG ， the changes of functional groups of coal samples before and after extraction by ILs/NMP were studied through FT-IR ， and the types of extract were analyzed by GC/MS. The results showed that the thermal weight loss of the coal samples increased and the content of oxygen-containing functional groups in the residues decreased after ILs/NMP extraction. In addition ， the extraction rate of hydrophobic ionic liquids/NMP to SMEC coal was greater than that of hydrophilic ionic liquids/NMP. The hydrophilic ionic liquid［Bmim］Cl/NMP and［Bmim］BF₄/NMPextracted 51 kind sand 44 kinds of organic substances ， respectively. Hydrophobic lonic liquids［ Bmim ］NTf₂/NMP and ［Bmim］PF₆/NMP extracted 28 and 29 organic substances ， respectively. Hydrophobic ionic liquids/NMP had stronger extraction ability for oxygen-containing functional compounds in SMEC coal than hydrophilic ionic liquids/NMP； Hydrophobic ionic liquids/NMP had lower extraction ability for heteroatom-containing compounds in SMEC coal than hydrophilic ionic liquids/NMP.

Key words:residue coal;fractional extraction;organic matter;hydrophilic ionic liquid;hydrophobic ionic liquid

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