Gradient separation of ⩾300°C distillate from low-temperature coal tar based on formaldehyde reactions

Sun, Ming; Ma, Xiaoxun; Lv, Bo; Dai, Xiaolin; Yao, Yi; Liu, Yuan Yuan; He, Min; Zhao, Xin

doi:10.1016/j.fuel.2015.07.029

Cited by 47 publications

(6 citation statements)

References 22 publications

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“…The comparison of LTCT and L-PE with HTCT and H-PE shows that the component contents are considerably different. As reported in the literature, 6,15,17 the component contents of coal tar or its fractions are not accurate. The final weight loss rate of L-PE and H-PE are 93.85 and 95.01 wt %, respectively.…”

Section: Resultsmentioning

confidence: 96%

“…At present, GC/MS is the most effective method for analyzing the composition and structure of coal tar. It can usually provide information on the composition and structure of the compounds with a relative molecular mass of less than 500 u and a boiling point of less than 300 °C. − This part is the main processing part of coal tar at present, such as phenol, naphthalene, and pyridine, which has an important guiding significance to the industrial processing of coal tar. Samples of coal tar must be vaporized at the injection of gas chromatography.…”

Section: Introductionmentioning

confidence: 99%

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Separation and Composition Analysis of GC/MS Analyzable and Unanalyzable Parts from Coal Tar

et al. 2018

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Composition analysis of coal tar remains a challenging task because of its complex components. In this paper, the compositions of low temperature coal tar (LTCT) and the wash oil fraction of high temperature coal tar (HTCT) were studied. A thermogravimetric analyzer (TG) combined with gas chromatography–mass spectrometry (GC/MS) with the same temperature program was put forward to analyze the quantitative determination of the GC/MS analyzable part of coal tar, and the composition and distribution of the GC/MS unanalyzable part (300LTCT and 300HTCT obtained from TG at the final temperature of 300 °C) was investigated by a pyrolysis gas chromatography–mass spectrometer (Py-GC/MS). Results reveal that light compositions can be extracted by petroleum ether (PE) more effectively than heavy compositions. PE soluble fractions of LTCT and HTCT cannot be totally gasified by GC/MS, and the remaining parts at above 300 °C are 6.51 wt % and 4.99 wt %, respectively. GC/MS combined with TG can accurately analyze the composition of ≤300 °C fractions in coal tar. Four dehydrogenation reactions were presented in the fast pyrolysis process of coal tar. An intermolecular association occurs in 300HTCT. 300LTCT is mainly composed of phenols, aliphatics, and aromatics. The composition analysis of 300LTCT and 300HTCT by Py-GC/MS indicates that there are some bridge bonds in the macromolecular structure of coal tar, and they have broken down to produce small molecular weight of phenolic compounds and aromatic hydrocarbons during pyrolysis.

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Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Separation and Composition Analysis of GC/MS Analyzable and Unanalyzable Parts from Coal Tar

et al. 2018

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“…High-temperature coal tar (HTCT) is a sticky liquid mixture from coal pyrolysis, containing various value-add chemicals, especially condensed arenes (CAs). − Many CAs can be synthesized by catalytic reactions, but synthesizing CAs usually needs multistep reactions in low yields. − Separating CAs from HTCT is more attractive due to the abundant presence of CAs in HTCT.…”

Section: Introductionmentioning

confidence: 99%

“…Extraction, − distillation, ,, crystallization, , and column chromatography (CC) , are used to separate CAs from HTCT. As a traditional separation method in industry, distillation has disadvantages of long process flow, low product purity, and high energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Effective Separation of Condensed Arenes from High-Temperature Coal Tar and Insight into Related Intermolecular Interactions

Wei

Zhao

et al. 2021

Energy Fuels

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An extraction-column chromatography system was designed to enrich and purify condensed arenes (CAs) from a hightemperature coal tar (HTCT). Pyrene, fluoranthene, phenanthrene, anthracene, and naphthalene were successfully enriched in the purities of 91.1, 98.1, 97.6, 100, and 97.7%, respectively, via extraction with petroleum ether and subsequent gradient elution by medium/highpressure preparative chromatography. The enriched CAs were characterized by gas chromatography/mass spectrometry along with 1 H and 13 C nuclear magnetic resonance spectrometries. The nonbonded interaction energy between PE and CAs was calculated to reveal the mechanism for intermolecular interaction during the extraction. The reduced density gradient method proved the wide existence of van der Waals forces and the X−H•••π bonds (X denotes >N, >CH, or −O) between PE and CAs through molecular dynamics simulation.

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“…Crystallization, distillation, , solvent extraction, , and column chromatography (CCG) were used for separating value-added chemicals (VACs) from HTCT. Many volatile organic solvents were used for solvent extraction .…”

Section: Introductionmentioning

confidence: 99%

Effective Separation and Purification of Nitrogen-Containing Aromatics from the Light Portion of a High-Temperature Coal Tar Using Choline Chloride and Malonic Acid: Experimental and Molecular Dynamics Simulation

Yan

Zong

et al. 2020

ACS Sustainable Chem. Eng.

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An effective deep eutectic solvent (DES) combined with column chromatography was designed for separating nitrogen-containing aromatics (NCAs) from the light portion (LP, which is petroleum ether-extractable portion) of a high-temperature coal tar. The total content of NCAs enriched with equimolar choline chloride (CC)/malonic acid mixture is much higher than that with other CC-based DESs. The maximum total recovery of NCAs is 57.2% with 1:2 of DES/LP mass ratio from the third run of extracting LP at 35 °C. The relative contents of carbazole, benzo[h]quinoline, and quinoline enriched by flash preparative chromatography are 93.3, 92.0, and 90.4%, respectively. In addition, the nonbonded interaction energy among the DESs, NCAs, and condensed arenes was calculated for demonstrating the difference in extract yield with diverse DESs. The reduced density gradient method proved that the typical hydrogen bonds, X–H···π bonds (X denotes >C, >N, or −O), and van der Waals forces widely exist among the DESs and NCAs through molecular dynamics simulations.

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Gradient separation of ⩾300°C distillate from low-temperature coal tar based on formaldehyde reactions

Cited by 47 publications

References 22 publications

Separation and Composition Analysis of GC/MS Analyzable and Unanalyzable Parts from Coal Tar

Separation and Composition Analysis of GC/MS Analyzable and Unanalyzable Parts from Coal Tar

Effective Separation of Condensed Arenes from High-Temperature Coal Tar and Insight into Related Intermolecular Interactions

Effective Separation and Purification of Nitrogen-Containing Aromatics from the Light Portion of a High-Temperature Coal Tar Using Choline Chloride and Malonic Acid: Experimental and Molecular Dynamics Simulation

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