A three-step dissociation method for converting Xiaolongtan lignite into soluble organic compounds: Insights into chemicals, geochemical clues, and structural characteristics

Liu, Fang-Jing; Zong, Zhi‐Min; Li, Wei-Tu; Zhu, Xiangnan; Wei, Xian‐Yong; Tang, Mingkai; Huang, Zaixing

doi:10.1016/j.fuel.2018.11.009

Cited by 10 publications

(10 citation statements)

References 45 publications

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“…Their parent products can be classified into hydrocarbons (HCs), alkanoic acids or alkenoic acids (AAs), alkanedioic acids or alkenedioic acids (ADAs), alkanetricarboxylic acids or alkenetricarboxylic acids (ATCAs), benzene carboxylic acids (BCAs), nitrogen containing species (NCSs), sulfur containing species (SCSs), and others species (OSs) (Liu et al 2019a;Liu et al 2013b;Liu et al 2013c;Wang et al 2014).…”

Section: Gc/ms Analysismentioning

confidence: 99%

Oxidation of Zhundong subbituminous coal in aqueous Fe2+/ glacial acetic acid solution with H2O2

Chen¹,

Zhou²,

Zhao³

et al. 2020

Preprint

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The improvement of the reactivity of H2O2 and Zhundong subbituminous coal (ZS) was focused on in this work. The mild oxidation of ZS was carried out under different conditions. The liquid oxidation products were analyzed using gas chromatography /mass spectrometry (GC/MS). The results suggest that Fe2+ and glacial acetic acid (GAA) have a synergistic effect on the H2O2 oxidation of ZS, which can significantly promote the conversion of ZS and the production of liquid products. In total, 40 compounds are identified, which could be categorized as 8 group components. Most of them are valued-added chemicals. Among the detected compounds, carboxylic acids (CAs) is the most abundant, accounting for 47.22% of all the group components in TRC. Moreover, according to the compounds detected by GC/MS, condensed aromatic rings are significantly abundant than aliphatic moieties in organic matter of ZS. -CH2CH2- are predominant bridged linkages connecting aromatic rings in ZS. The existing forms of organic nitrogen and sulfur species contain quinolins, pyrroles, pyrimidins, quinoxalines, enamides, oxazoles, isoquinolines, thiazols, sulfonamides in ZS.

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Section: Gc/ms Analysismentioning

confidence: 99%

Oxidation of Zhundong subbituminous coal in aqueous Fe2+/ glacial acetic acid solution with H2O2

Chen¹,

Zhou²,

Zhao³

et al. 2020

Preprint

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“…The yield and distribution of benzenecarboxylic acids depend on the structure and content of condensed aromatic rings in the residue. 10,11 The methods used for studying coal structure include chemical, physical and physicochemical methods. 12 Advanced modern analytic techniques, such as elemental analysis, Fourier transform infrared (FTIR) spectroscopy, 13−15 nuclear magnetic resonance (NMR), 14,16,17 X-ray diffraction (XRD), 14,16,18 Raman spectroscopy, 14,18 and X-ray photoelectron spectroscopy (XPS) 16,19 are used for physical methods to directly study the elemental composition, functional groups, and carbon skeleton of coal, which can truly reflect the structural features of the OM in a nondestructive way.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Compositional Structures of the Organic Matter and Biomarker Distributions in Shengli Lignite

Liu,

Gao,

Yang

et al. 2024

ACS Omega

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The structural characteristics of the organic matter and biomarker distributions in Shengli lignite (SL) were comprehensively studied by combining a variety of modern analytical techniques and solvent extraction/thermal dissolution. Characterization of SL with Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, solid 13 C nuclear magnetic resonance spectroscopy and thermogravimetry showed that organic matter in SL is rich in oxygen functional groups, such as C−O, >C�O, and −COOH, and hydrogen bonds. The hydrogen bonds mainly include −OH•••π, self-associated −OH, −OH•••ether O, tightly bound cyclic −OH, −OH•••N, −COOH dimers, and −SH•••N.The highest content of organic nitrogen and sulfur on SL surface are pyrrole nitrogen and aromatic sulfur, respectively. The proportions of aromatic and aliphatic carbons in SL are about 58% and 39%, respectively. The aromatic carbon is mainly composed of protonated aromatic and aromatic bridged carbons; methylene carbon has the highest content among the aliphatic carbons, with chains of average length of 1.43 carbon atoms. The average number of aromatic structural units in the carbon skeleton of SL is about 3, and each aromatic structural unit contains an average of 1−2 substituent groups. Thermogravimetric analysis clarified the distribution of the main types of covalent bonds in SL and their possible cracking temperatures during pyrolysis. The extracts and soluble portion of thermal dissolution from SL were analyzed by a gas chromatograph/mass spectrometer, and a series of biomarkers were identified, mainly concentrated in petroleum ether extract and cyclohexane thermal soluble portion. These included long-chain n-alkanes, isoprenoid alkanes, long-chain n-alkenes, terpenoids, n-alkan-2-ones, long-chain n-alkylbenzene, and long-chain n-alkyltoluene. The comprehensive characterization of the organic matter and the distribution of related biomarkers provided an important scientific basis for understanding the molecular structural characteristics and geochemical information on SL.

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“… 3 , 4 There are five kinds of intermolecular forces in coal, including entanglement interaction between alkyl and alkyl groups, π–π interaction between aromatic rings, weak hydrogen bonds, strong hydrogen bonds, and hydrogen bond/π–π complex interaction. 5 , 6 Different solvents can selectively break the intermolecular interaction in low-rank coal. 7 − 9 Therefore, sequential extraction with different solvents can effectively improve the extraction efficiency of organic matter in coal.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, clean and efficient utilization of coal has become the top priority. , Solvent extraction under mild conditions can separate organic matter from coal by the principle of similar phase dissolution, without damaging the environment. The structure and composition characteristics of coal can be reflected by analyzing the molecular structure of the soluble molecules. , There are five kinds of intermolecular forces in coal, including entanglement interaction between alkyl and alkyl groups, π–π interaction between aromatic rings, weak hydrogen bonds, strong hydrogen bonds, and hydrogen bond/π–π complex interaction. , Different solvents can selectively break the intermolecular interaction in low-rank coal. − Therefore, sequential extraction with different solvents can effectively improve the extraction efficiency of organic matter in coal.…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis Kinetic Analysis of Sequential Extract Residues from Hefeng Subbituminous Coal Based on the Coats-Redfern Method

Huang

et al. 2022

ACS Omega

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Sequential extract residues (R i , i = 1, 2, 3, 4, and 5) were obtained from Hefeng acid-washing coal (HF AC ) by petroleum ether, carbon disulfide, methanol, acetone, and isometric carbon disulfide/acetone mixture, sequentially. Pyrolysis behavior of the residues was determined using thermogravimetry analysis. The Coats–Redfern method with different reaction orders was used to analyze the pyrolysis kinetic of each sample, and the kinetic parameters, including correlation coefficient ( R 2 ), activation energy ( E ), and pre-exponential factor ( A ), were calculated. Results showed that the weight loss of extract residues was higher than HF AC , and pyrolysis behavior varies greatly for residues, which is related to the unstable structure after extraction. From conversion–temperature (α– T ) curves, the pyrolysis process was divided into three stages: low-temperature stage (150–350 °C), medium-temperature stage (350–550 °C), and high-temperature stage (550–950 °C). The medium-temperature stage made great contribution to the process of pyrolysis, which was dominated by depolymerization and decomposition reaction. The relationship between kinetic parameters and reaction order showed that the swelling effect is an important reason for the discrepancy of E for each sample in the process of pyrolysis.

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A three-step dissociation method for converting Xiaolongtan lignite into soluble organic compounds: Insights into chemicals, geochemical clues, and structural characteristics

Cited by 10 publications

References 45 publications

Oxidation of Zhundong subbituminous coal in aqueous Fe2+/ glacial acetic acid solution with H2O2

Oxidation of Zhundong subbituminous coal in aqueous Fe2+/ glacial acetic acid solution with H2O2

Investigation on Compositional Structures of the Organic Matter and Biomarker Distributions in Shengli Lignite

Pyrolysis Kinetic Analysis of Sequential Extract Residues from Hefeng Subbituminous Coal Based on the Coats-Redfern Method

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