- Title
- Solvent extraction of Chinese lignite and chemical structure changes of the residue during H₂O₂ oxidation
- Creator
- Tahmasebi, Arash; Jiang, Yu; Yu, Jianglong; Li, Xianchun; Lucas, John
- Relation
- Fuel Processing Technology Vol. 129, Issue January 2015, p. 213-221
- Publisher Link
- http://dx.doi.org/10.1016/j.fuproc.2014.09.024
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2015
- Description
- Solvent extraction and oxidation of coal under mild conditions can assist in understanding of coal chemical structure. It can also offer a potential for conversion of coal into useful chemicals, allowing more efficient use of coal resources. In this study, a Chinese lignite was extracted by different solvents including CS₂, ethanol, and acetone. The composition of the extracts was analyzed by GC-MS method. It was found that the CS₂ extracts contained high amounts of aliphatic hydrocarbon. The ethanol and acetone extracts mainly contained oxygen-containing compounds. The effects of reaction temperature and residence time on coal oxidation and composition of extract residueswere also investigated. The results showed that lignite was readily oxidized in H₂O₂ aqueous solution at temperatures above 40 °C, and the oxidation behavior (oxidation rate, product distribution and yields) was strongly temperature dependent. Oxidation of extract residues in H₂O₂ solution was carried out at different temperatures. Water soluble products of oxidation were analyzed using the GC-MS. Aliphatic hydrocarbons were present in all oxidation steps. The relative content of esters in all oxidation stepswas also high. The chemical structure changes of coal, the extract residues, and the oxidation residueswere studied using FTIR technique. The results indicated that the extract residues had lower intensity of aliphatic hydrogen compared to raw coal. The aromatic carbon concentration remained relatively unchanged when oxidized at temperatures below 30 °C, then decreased slightly with increasing the oxidation temperature.
- Subject
- solvent extraction; oxidation; lignite; extract residue; chemical structure
- Identifier
- http://hdl.handle.net/1959.13/1332234
- Identifier
- uon:26817
- Identifier
- ISSN:0378-3820
- Language
- eng
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