Characteristics of the mesophase and needle coke derived from the blended coal tar and biomass tar pitch

Li, Lei; Lin, Xiongchao; Zhang, Yukun; Dai, Jianing; Xu, Dan; Wang, Yonggang

doi:10.1016/j.jaap.2020.104889

Cited by 58 publications

(26 citation statements)

References 23 publications

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“…However, the sample GNK-MP-400 C-6 h was the green needle coke with 33% fiber texture H ar , aromatic hydrogens (6.2-8.7 ppm); H α , aliphatic hydrogens in methyl or methylene groups in the α position to an aromatic ring (2.0-4.0 ppm); H n , naphthenic hydrogens (2.0-2.6 ppm); H β , aliphatic hydrogens in methyl or methylene groups in the β position to an aromatic ring (1.0-1.4 ppm); H γ , aliphatic hydrogens in methyl or methylene groups in the γ position to an aromatic ring (0.7-1 ppm). [19,36] and 44% mosaics texture, because the formation process of mesophase was terminated at the higher temperature.…”

Section: Polarizing Analysismentioning

confidence: 99%

“…This structure was the mesophase structure required for the preparation of green needle coke. [19,37]…”

Section: Ft-ir Analysismentioning

confidence: 99%

“…And, it usually uses petroleum-based oils, [14,15] coal tar-based oils, [16,17] and other aromatic compounds rich in alkyl side chains [18] as co-carbonizing agents. Li et al [19] found that the high-temperature coal tar pitch was cocarbonized with biomass pitch to obtain mesophase pitch under a constant temperature of 410 C for 4 h and green needle coke at 490 C. Cheng et al [16] acquired the mesophase and green needle coke for preparing high-quality needle coke using ethylene tar pitch and polystyrene at a constant temperature of 480 C in two stages. However, it is rare to use medium-and low-temperature coal tar as a co-carbonizing agent for co-carbonization reaction for the preparation of mesophase and green needle coke.…”

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confidence: 99%

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Co‐Carbonization of Medium‐ and Low‐Temperature Coal Tar Pitch and Coal‐Based Hydrogenated Diesel Oil Prepare Mesophase Pitch for Needle Coke Precursor

Tian

Huang

Yu³

et al. 2021

Adv Eng Mater

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Needle coke is a type of high-quality coke with needle-like texture and layer structure. [1] Also, it presents a turbine carbon structure under the scanning electron microscope. [2,3] Needle coke was acknowledged as an exceptional raw material to obtain carbon materials, because it has low coefficient of thermal expansion (CTE), high mechanical strength, easy to graphitization, and other advantages. Therefore, it is widespread used in lithium battery anode materials, high-power, ultrahigh-power graphite electrodes, and so on. [4,5] At present, residual heavy oil, catalytic cracking slurry, and high-temperature coal tar pitch are commonly used to prepare needle coke. [6][7][8] The heavy pitch component of medium-and lowtemperature coal tar has the advantages of high aromaticity, low quinoline insoluble (QI) content, and narrower molecular weight distribution. [9] So, it is an excellent raw material for the preparation of needle coke. However, the higher heteroatom content and saturation in the raw materials lead to higher thermal reaction rate in a carbonization process, which is unfavorable to prepare needle coke and the mesophase with a wide-area streamline structure. [10,11] Because the mesophase with an orderly wide-area streamlined structure is precursor for the production of high-performance green needle coke during the coke is pulled by the airflow. [12] The appropriate pretreatment methods are used to reduce the thermal reactivity of raw materials, which is essential for preparing mesophase pitch. Garcia et al. [11] reported that the

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Section: Polarizing Analysismentioning

confidence: 99%

“…This structure was the mesophase structure required for the preparation of green needle coke. [19,37]…”

Section: Ft-ir Analysismentioning

confidence: 99%

mentioning

confidence: 99%

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Co‐Carbonization of Medium‐ and Low‐Temperature Coal Tar Pitch and Coal‐Based Hydrogenated Diesel Oil Prepare Mesophase Pitch for Needle Coke Precursor

Tian

Huang

Yu³

et al. 2021

Adv Eng Mater

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“…The unique physicochemical properties of medium–low‐temperature coal tar pitch (MLP) make it an interesting material in many research fields 3 . It has been used as a feedstock for the production of added‐value materials such as liquid fuels, 4,5 mesophase pitch, 6 needle coke, 7 fine mosaic coke, 8 and activated carbon 9–13 …”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of mesophase coke from medium–low‐temperature coal tar pitch modified by high‐pressure thermal polymerization

Bai

Zhu

et al. 2021

Asia-Pacific J Chem Eng

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Medium–low‐temperature coal tar pitch (MLP) is a by‐product of semi‐coke fabrication with a high content of carbon. However, the small amount of aromatic organic compounds in MLP makes prevents its practical use as a feedstock for the production of high‐quality artificial carbon materials (such as needle coke) via direct thermal conversion. To understand the effects of autogenous pressure thermal polymerization (APTP) on the microstructure of mesophase coke, we performed APTP at different reaction temperatures to produce MLP, which was further utilized as a starting material for the synthesis of mesophase coke. The microstructure of mesophase coke was studied by optical microscopy, X‐ray diffraction, Raman spectroscopy, and scanning electron microscopy. Moreover, the micro‐strength of the mesophase coke was examined. We concluded that the APTP treatment of MLP before direct carbonization of a liquid is an excellent method for the production of high‐quality mesophase coke.

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“…Needle coke was one of the most important mesophase coke, which was usually used as the raw materials to produce graphite electrode (especially ultra‐high power graphite electrode), 1–5 anode materials for commercial lithium‐ion battery, 6 electrode materials for supercapacitor, 7–10 anode materials for high‐performance sodium‐ion battery, 11 absorbing materials, 12,13 isotropic graphite, 14–16 and other function materials 17–19 . It was generally accepted that the needle coke can be divided into two types according to the different raw sources materials and named as coal‐based needle coke (usually obtained by coal tar pitch) and petroleum‐based needle coke (synthesized from petroleum pitch) 20 …”

Section: Introductionmentioning

confidence: 99%

Transformation of microstructure of coal‐based and petroleum‐based needle coke: Effects of calcination temperature

Zhu

et al. 2021

Asia-Pacific J Chem Eng

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Needle coke was recognized as one of the most important precursor to produce ultra‐high power graphite electrode, commercial anode materials for lithium‐ion battery, and special graphite materials. It was generally accepted that the microstructure of needle coke has been acted as a key role on the quality of its derived graphite materials. In this work, four kinds of green needle cokes (coal‐based green needle coke and petroleum‐based green needle coke) have been used as the raw materials to investigate the changes of micro‐structure during the calcination process. The micro‐structure of needle cokes at different calcination temperature has been detailed characterized by X‐ray diffraction (XRD), Raman spectrum, scanning electron microscope (SEM), and transmission electron microscopy (TEM), respectively. Briefly, the size of carbon crystalline (Lc), the content of graphite carbon (IG/IAll), and the content of regular carbon microcrystals (Ig) in coal‐based needle coke were higher than petroleum‐based needle coke when the calcinations temperature was below 1500°C. What's more, the calcinations temperature of 1400°C is the characteristic temperature of the transition of carbon microcrystalline. In other words, the coal‐based needle coke was easier to graphitization than petroleum‐based needle coke.

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Characteristics of the mesophase and needle coke derived from the blended coal tar and biomass tar pitch

Cited by 58 publications

References 23 publications

Co‐Carbonization of Medium‐ and Low‐Temperature Coal Tar Pitch and Coal‐Based Hydrogenated Diesel Oil Prepare Mesophase Pitch for Needle Coke Precursor

Co‐Carbonization of Medium‐ and Low‐Temperature Coal Tar Pitch and Coal‐Based Hydrogenated Diesel Oil Prepare Mesophase Pitch for Needle Coke Precursor

Synthesis and characterization of mesophase coke from medium–low‐temperature coal tar pitch modified by high‐pressure thermal polymerization

Transformation of microstructure of coal‐based and petroleum‐based needle coke: Effects of calcination temperature

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