Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6640179 | Fuel | 2013 | 6 Pages |
Abstract
Alkylsulfate-based ionic liquids (ILs) were synthesized and used as solid-liquid separation solvents to extract asphaltene-type materials from direct coal liquefaction residue (DCLR). Among the ILs employed, tetraethylammonium ethylsulfate ([E4N][ESO4]) was proved to be a potential solvent for trapping asphaltene-type materials from DCLR due to the higher extraction yield and the lower H/C atomic ratio of the extract. N-methyl-2-pyrrolidone (NMP) was added to reduce the viscosity of [E4N][ESO4]. It also increased the extraction yield and decreased H/C atomic ratio of the asphaltene-type materials. The mechanism of extraction might be concluded that the interactions are formed between ILs or [E4N][ESO4]/NMP mixed solvents and asphaltene-type materials, which disturbs the interactions between DCLR and leads to the dissolution of asphaltene-type materials into solvents. The obtained asphaltene-type materials possessed low H/C atomic ratios, high aromaticities, no ashes and no quinoline insolubles, which meet the requirements of preparing carbon materials.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Lu Bai, Yi Nie, Jincheng Huang, Yi Li, Haifeng Dong, Xiangping Zhang,