Production of isotropic coke by thermocracking of the anthracene fraction of coal tar

Moskalev, I. V.; Kiselkov, Dmitriy; Стрельников, В. Н.; Вальцифер, В. А.; Lykova, K. A.

doi:10.3103/s1068364x14030053

Cited by 9 publications

(5 citation statements)

References 5 publications

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“…The properties of fine mosaic coke play a key role in deciding the quality of its derived artificial carbon materials. Moreover, the physico‐chemical properties of MLP also affect the quality of fine mosaic coke derived from it . In other words, the properties of MLP play a key role in the production of artificial carbon materials derived from it.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Conversion Behavior of Medium–Low–Temperature Coal Tar Pitch During Liquid–Phase Carbonization Process

Zhu

Zhao

et al. 2019

ChemistrySelect

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Medium–low temperature coal tar pitch (MLP) is a type of aromatic carbonaceous material obtained by the low temperature distillation of low rank coal, and is considered as a desirable raw material for the production of artificial carbon/graphite material. The thermal conversion behaviors of MLP during the liquid‐phase carbonization process were analyzed in detail in this study. Further, the changes of molecular structure and carbon microcrystalline structure of MLP and liquid‐phase carbonization products derived from it were quantitatively investigated by optical microscopy, fourier transform infrared spectroscopy, Raman spectroscopy, X‐ray diffraction, and curve‐fitting method. Results showed that both branched chain and the contents of C=O functional groups in the MLP played a key role in the reaction reactivity. Moreover, temperature of 450 °C was found to be a rapid changing temperature point on the enhancement of thermal conversion of MLP. The stacking height (Lc), parallel layers (N), average number of aromatic rings in each layer (n), ratio of ‘impurity’ structure (RI), ratio of amorphous carbon structure (RAC), ratio of graphite carbon structure (RGC), and ratio of defects graphite carbon structure (RDGC) exhibited a significant change with the improvement of liquid‐phase carbonization temperature.

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Section: Introductionmentioning

confidence: 99%

“…Moreover, the physico-chemical properties of MLP also affect the quality of fine mosaic coke derived from it. [16][17][18] In other words, the properties of MLP play a key role in the production of artificial carbon materials derived from it.…”

Section: Introductionmentioning

confidence: 99%

Thermal Conversion Behavior of Medium–Low–Temperature Coal Tar Pitch During Liquid–Phase Carbonization Process

Zhu

Zhao

et al. 2019

ChemistrySelect

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“…Isotropic coke may be produced by processing the anthracene fraction under its own vapor pressure (up to 5 MPa) at 500°C, with a heating rate of around 10°C/min [15]. The coke obtained in such conditions has uniform isotropic microstructure (with a score of 2) and a fine pore macrostructure.…”

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confidence: 99%

Production of isotropic coke in industrial trials

et al. 2014

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The influence of the production conditions on the properties of coke is considered. Coke is pro duced in a pilot plant at the Institute of Technical Chemistry, Ural Branch, Russian Academy of Sciences, in a 200 L reactor equipped with an air supply valve and heating elements. The first stage in coke production is air blowing of the batch with constant temperature rise at 10-12°C/h from 290-310°C; the air flow rate is 45-55 L/kg h. At this stage, the final air blowing temperature and the batch composition are varied. The sec ond stage is coking, with temperature rise at 25°C/h to 550-600°C. The batch consists of industrial air blown pitch (ABP), modified by pitch tar (PT). Oxidation of the ABP, even with a very high final temperature (434°C), does not permit the production of isotropic coke. An analogous result is obtained on adding small portions of PT to the batch (15%). On adding >50% PT, totally isotropic coke may be produced. To obtain coke of isotropic microstructure, the optimal content of PT is 36-41%, and the final air blowing temperature should be high (>390°C). The influence of PT on the structural parameters of the coke is associated with the formation of nonmesogenic structures on air blowing. On coking, these structures suppress the growth of large mesophase. The isotropic coke produced has the following characteristics: limited expansion in the range 1300-2400°C; high structural strength; and optimal density. Graphite based on such coke is consider ably superior to graphite based on industrial pitch coke in terms of its compressive strength, density, and elec trical resistivity.

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“…It was accepted that the mosaic coke meant the total contents of Mf, Mm, and Mc higher than 75% . As shown in Table , the total mosaic structure (Mf + Mm + Mc) of AGDP‐C, XJDP‐C, SXDP‐C, KLDP‐C, and SPDP‐C were 78.81%, 76.66%, 93.89%, 93.20%, and 83.76%, respectively.…”

Section: Resultsmentioning

confidence: 97%

“…Mosaic coke was considered as an important raw material for the production of special graphite, with its excellently high temperature performance, good electrical conductivity, high strength properties, and high density . Mosaic coke, also named as isotropic coke, was a kind of pitch coke with the optical microstructure of majoring in mosaic structure (the total contents of fine mosaic structure, medium mosaic structure, and coarse mosaic structure is more than 75%) . Mosaic coke was generally produced by the method of liquid carbonization of coal tar pitch.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of mosaic coke from heavy‐phase coal pitch

Zhu

et al. 2019

Asia-Pacific J Chem Eng

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Mosaic coke is a considerable intermediate material to produce high‐quality special graphite (isotropic graphite and nuclear graphite). The properties of mosaic coke keep a key role on the quality of special graphite. For a detailed investigation on the feasibility of the production of high‐quality mosaic coke with heavy‐phase coal pitch as the raw material, five kinds of heavy‐phase coal pitches with varied basic physical properties were used as the raw materials to produce mosaic coke in this study. Briefly, Fourier‐transform infrared spectroscopy spectrum combined with curve fitting method have been used to determine the aromatic condensation index (Iar) of heavy‐phase coal pitch. The polarizing microscope incorporated with carbon theory, scanning electron microscopy, X‐ray diffraction, and Raman spectrum have been used to characterize the microstructure of mosaic cokes. The micro‐strength of mosaic cokes have been examined by the micro‐strength tester. The results have shown that the heavy‐phase coal pitches with Iar less than 0.91 are the potential raw materials to produce the high‐quality mosaic coke with higher micro‐strength (higher than 79%).

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Production of isotropic coke by thermocracking of the anthracene fraction of coal tar

Cited by 9 publications

References 5 publications

Thermal Conversion Behavior of Medium–Low–Temperature Coal Tar Pitch During Liquid–Phase Carbonization Process

Thermal Conversion Behavior of Medium–Low–Temperature Coal Tar Pitch During Liquid–Phase Carbonization Process

Production of isotropic coke in industrial trials

Preparation and characterization of mosaic coke from heavy‐phase coal pitch

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