Thermal Dissolution of Shengli Lignite in Isometric Methanol and Ethyl Acetate Mixed Solvent — Molecular Composition of the Extract and the Role of Ethyl Acetate
- DOI
- 10.2991/mmeceb-15.2016.87How to use a DOI?
- Keywords
- Shengli Lignite; Phenols; Thermal Dissolution Mechanism; Hydrogen Bond
- Abstract
Thermal dissolution (TD) of Shengli lignite was carried out in isometric solvent of methanol and ethyl acetate (EA), methanol, and EA to offer the thermally soluble fractions 1-3 (F1-F3), respectively. F1-F3 were analyzed by gas chromatography/mass spectrometry and direct analysis in real-time ionization source/ion trap mass spectrometry (DARTIS/IT-MS). Phenols with 1-4 methyls are the most abundant composition in the extract. The DARTIS/IT-MS analysis shows that the main peaks of the molecular weight distribution of the extract are located at m/z 120-340, and trace signals are still observed at m/z 640. The extract yield of F1 is higher than those of F2 and F3, even the sum of F2 and F3 yields. The roles of EA to lignite TD were investigated by experimental comparison and molecular dynamics simulation. Both the increase in nucleophilicity and the O-H bond extension of methanol due to the formation of intermolecular hydrogen bonds between methanol and EA make the nucleophilic attacking and the scission of O-H bond easier. The transesterification reaction with EA occurs during lignite TD. These results demonstrate that the TD process can be slightly adjusted by altering the microstructure and microenvironment of methanol.
- Copyright
- © 2016, the Authors. Published by Atlantis Press.
- Open Access
- This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
Cite this article
TY - CONF AU - Xingshun Cong AU - Min Li AU - Hangyu Gao AU - LingLing Zhang AU - Niancun Ji PY - 2015/12 DA - 2015/12 TI - Thermal Dissolution of Shengli Lignite in Isometric Methanol and Ethyl Acetate Mixed Solvent — Molecular Composition of the Extract and the Role of Ethyl Acetate BT - Proceedings of the 2015 2nd International Conference on Machinery, Materials Engineering, Chemical Engineering and Biotechnology PB - Atlantis Press SP - 441 EP - 446 SN - 2352-5401 UR - https://doi.org/10.2991/mmeceb-15.2016.87 DO - 10.2991/mmeceb-15.2016.87 ID - Cong2015/12 ER -