1. Composition Distribution of the Thermal Soluble Organics from Naomaohu Lignite and Structural Characteristics of the Corresponding Insoluble Portions.
- Author
-
Zhu, Meixia, Ma, Yaya, Mo, Wenlong, Hao, Shihao, Wei, Xianyong, Fan, Xing, Ren, Tiezhen, Ma, Kongjun, and Guo, Jia
- Subjects
LIGNITE ,FOURIER transform infrared spectroscopy ,X-ray photoelectron spectroscopy ,GAS chromatography/Mass spectrometry (GC-MS) ,ORGANIC compounds ,ETHYL acetate ,COALBED methane - Abstract
With cyclohexane (CH), benzene (BE), and ethyl acetate (EA) as solvents, Naomaohu lignite (NL, a typical oil-rich, low-rank coal) from Hami, Xinjiang, was thermally dissolved (TD) to obtain three types of soluble organics (NL
CH , NLBE , and NLEA ) and the corresponding insoluble portions (NLCH-R , NLBE-R , and NLEA-R ). Ultimate analysis, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG-DTG), and gas chromatography–mass spectrometry (GC/MS) were used to characterize NL and its soluble and insoluble portions. Results showed that, compared with NL, the C element in NLCH-R , NLBE-R , and NLEA-R increased, while the O element decreased significantly, indicating that thermal dissolution is a carbon enrichment process and an effective deoxidation method. The GC/MS results showed that oxygen-containing organic compounds (OCOCs) are dominant in NLCH , NLBE , and NLEA . NLCH is mainly composed of ketones (11.90%) and esters (19.04%), while NLBE and NLEA are composed of alcohols (12.18% and 2.42%, respectively) and esters (66.09% and 84.08%, respectively), with alkyl and aromatic acid esters as the main components. Among them, EA exhibits significant selective destruction for oxygen-containing functional groups in NL. XPS, FTIR, and TG-DTG results showed that thermal dissolution can not only affect the macromolecular network structure of NL, but also improve its pyrolysis reactivity. In short, thermal dissolution can effectively obtain oxygen-containing organic compounds from NL. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF