Industrial perspective of the cokemaking technologies

Tiwari, H. P.; Saxena, V. K.

doi:10.1016/b978-0-08-102201-6.00008-x

Cited by 13 publications

(6 citation statements)

References 39 publications

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“…The research conducted by Nomura and Arima [3] proved that the addition of a coalderived binder can reduce the yield of volatile products from the blend during pyrolysis at the temperature below 450 • C. Coal tar and coal tar pitch (CTP) have been known for a long time as additives that improve the fluidity of coals [4][5][6][7][8] and their caking properties [3,4]. The authors of the works [9,10] suggest that pitch additives can be used as additives that bring back the lost thermoplastic abilities to low-oxidized coals.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Coal Tar Pitches on Thermal Behaviour of a High-Volatile Bituminous Polish Coal

Zubkova

Strojwas

2022

Materials

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The influence of three coal tar pitches (CTPs), having softening points at 86, 94, and 103 °C, on the thermal behaviour of a defrosted high-volatile coal during co-carbonization and co-pyrolysis was studied. The following research techniques were used: X-raying of the coked charge, TG/FT-IR, ATR and UV spectroscopies, extraction, SEM, STEM, and XRD. It was determined that CTP additives change the structure of the coal plastic layer, the thickness of its zones, and the ordering degree of the structure of semi-cokes to a different extent and independently from their softening points. The softening points of CTPs do not influence the composition and yield of volatile products emitted from blends with pitch as well as the composition, structural-chemical parameters, and topological structure of material extracted from coal blends. It is suggested that such a lack of existence of any correlation between the softening points of CTPs and the degree of their influence on the thermal behaviour of coal was caused by the presence of the atoms of metals (Fe and Zn) in the CTPs. These atoms change the course of the carbonization of the CTPs themselves and their influence on organic substance of coal in blends with CTPs.

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Section: Introductionmentioning

confidence: 99%

The Influence of Coal Tar Pitches on Thermal Behaviour of a High-Volatile Bituminous Polish Coal

Zubkova

Strojwas

2022

Materials

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“…The high-temperature coal coking to produce metallurgical coke is the second large-scale process of coal utilization in China and in Russia. This process is an inherent part of the integrated production of iron and steel where both at present and centuries ago traditional blast furnace technology using indispensable metallurgical coke dominates [1][2][3]. The key challenge of the blast furnace technology development is a radical decrease in the specific consumption of coke because of its high cost (its production accounts for almost half of all costs for metal production), significant CO2 emission, and limited resources of high-quality coking coals [1,2].…”

Section: Introductionmentioning

confidence: 99%

Thermal Solvolysis of Coals Under Mild Conditions as an Alternative Way to Produce Aromatics for Carbon Materials

Kuznetsov¹,

Avid²,

Kuznetsova³

et al. 2021

Atlantis Highlights in Chemistry and Pharmaceutical Sciences

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Russia, China and, Mongolia are among the countries having large reserves of coals which are traditionally utilized mainly as a fuel for energy generation. In the present paper, the solvolysis of a large series of differentranked coals from various deposits of Russia and Mongolia in anthracene oil as a solvent to produce soluble aromatic substances was studied. All the coal samples were well characterized by the data on the chemical composition and on the conventional classification industrial indexes. The correlations between the composition and properties of coals and their reactivity for pyrolysis and for solvolysis with anthracene oil into soluble products were analyzed. Well defined correlations were established between the coal conversion into quinoline solubles and the properties of coals such as vitrinite reflectance, the yield of volatile matter, carbon content, and temperature at which the main decomposition occurs during coal pyrolysis. The criteria for the properties of coals suitable for solvolytic conversion into soluble aromatic substances are suggested. The chemical and group composition and the characteristics of the molecular structure of the soluble products obtained were studied using chemical and 1 H and 13 C NMR techniques. The extract obtained can serve as an alternative source for aromatics, liquid fuels, and for the production of a substitute for coal-tar pitch binder and for other purposes.

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“…The production of advanced carbon materials and composites is largely based on the use of monocyclic and polycyclic aromatic compounds. The need in the polycyclic aromatics is provided mainly (near 95%) by coal tar, most high-tech carbon materials and composites are produced from its nonvolatile fractioncoal-tar pitch. , Coal tar is a minor byproduct during the production of metallurgical coke, which is an indispensable material in the blast furnace (BF) for iron and steel manufacturing. , In the long term, large-scale switch to competing alternative ironmaking technologies without coke will lead to a dramatic decrease in the demand for metallurgical coke and, consequently, a decrease in the production volume of coal tar and coal-tar pitch. At the same time, the needs for coal tar and coal-tar pitch are steadily increasing in the manufacturing of advanced carbon materials for different applications. , …”

Section: Introductionmentioning

confidence: 99%

“…1,2 Coal tar is a minor byproduct during the production of metallurgical coke, which is an indispensable material in the blast furnace (BF) for iron and steel manufacturing. 3,4 In the long term, large-scale switch to competing alternative ironmaking technologies without coke will lead to a dramatic decrease in the demand for metallurgical coke and, consequently, a decrease in the production volume of coal tar and coal-tar pitch. At the same time, the needs for coal tar and coal-tar pitch are steadily increasing in the manufacturing of advanced carbon materials for different applications.…”

Section: Introductionmentioning

confidence: 99%

Solvolysis of Bituminous Coal in Coal- and Petroleum-Derived Commercial Solvents

2020

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The solvolytic conversion of softening bituminous coal at 380 °C in solvents derived from the commercial hydrocarbon byproducts and residues from coal and petroleum processing was studied. Hydrogen-donor tetrahydronaphthalene (THN) and nondonor 1-methylnaphthalene (MN) were also used for comparison. The high-boiling solvents of different chemical classes (highly aromatic coal tar, its anthracene fraction, and low-aromatic heavy gas oil of catalytic cracking of the oil residue) and the H-donor THN solvent were found to exhibit high efficiency for coal conversion into quinoline-soluble products. The chemical and molecular compositions of coal, solvents, and dissolved products were characterized in detail by different techniques, including chemical analysis, group analysis, infrared Fourier transform (IRFT) spectroscopy, X-ray diffraction (XRD), liquid chromatography, and thermal analysis to reveal the chemical transformations of the coal–solvent mixture during the dissolution reaction. The solvolysis of coal in the liquid phase of both highly aromatic and low-aromatic solvents was found to involve selective depolymerization of polymer-like coal via breaking of weak linkages between the aromatic units, resulting in the formation of soluble pitchlike products. The effective dissolution of coal in the H-donor THN solvent resulted probably from a combination of the nonselective thermal fragmentation of the coal structure to smaller radical intermediates and their stabilization by hydrogen from THN, producing mainly tar and a few gases. The low-boiling solvents of both predominantly aromatic and aliphatic classes (gas oils from naphtha pyrolysis and delayed coking of the petroleum residue) and MN exhibited poor efficiency for coal dissolution. The concentrations of carcinogenic benzo(a)pyrene (BaP) in the solvents used and in the toluene fractions of the resulting extracts were analyzed. The remarkable result was that coal extracts, compared to solvents, contained much less BaP, probably due to its conversion with coal and/or solvent molecules during coal dissolution.

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Industrial perspective of the cokemaking technologies

Cited by 13 publications

References 39 publications

The Influence of Coal Tar Pitches on Thermal Behaviour of a High-Volatile Bituminous Polish Coal

The Influence of Coal Tar Pitches on Thermal Behaviour of a High-Volatile Bituminous Polish Coal

Thermal Solvolysis of Coals Under Mild Conditions as an Alternative Way to Produce Aromatics for Carbon Materials

Solvolysis of Bituminous Coal in Coal- and Petroleum-Derived Commercial Solvents

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