Effects of different extracted components from petroleum pitch on mesophase development

Li, Ming; Liu, Dong; Men, Zhuowu; Lou, Bin; Yu, Shitao; Ding, Junwei; Cui, Wenlong

doi:10.1016/j.fuel.2018.03.011

Cited by 49 publications

(24 citation statements)

References 27 publications

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“…Needle coke is a type of high-quality pitch-derived coke with a fibrous structure when viewed under a polarized microscope. , It is considered as a highly suitable precursor to produce mechanical materials and functional materials with its high true density, low coefficient of thermal expansion (CTE), high strength, low resistivity, low ash, low sulfur, low volatility, and easy graphitization. − For example, needle coke is generally accepted as the precursor to produce ultra-high-power graphite electrodes, , anode material of lithium ion batteries, , high energy density supercapacitors, − matrix reinforced materials, , superactivated carbon, graphene, perovskite solar cells, and so on.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Coal Pitch-Based Needle Coke (Part II): The Effects of β Resin in Refined Coal Pitch

Zhu

et al. 2020

Energy Fuels

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Refined coal tar pitch is considered as a promising material for the production of needle coke owing to its excellent physical–chemical properties. It was generally accepted that the basic properties of refined coal pitch played a vital role in affecting the resulting quality of the derived needle coke during the delayed coking process. Our previous research showed that an f a of 0.95–0.98 of refined coal pitch was optimal and produced needle coke of the highest quality. What is more, we found that the contents of β resin in refined pitch were also important to the properties (microstructure, microstrength, and true density) of the derived needle coke. Therefore, the effects of the contents of β resin on the properties of needle coke were investigated thoroughly, and eight types of refined coal pitch (the f a range from 0.9621 to 0.9725) with varied contents of β resin were employed as the precursors of needle coke. The techniques of proton nuclear magnetic resonance and gel permeation chromatography were utilized to determine the f a and molecular weight of each refined coal pitch, respectively. Microstructures (optical microstructure and surface morphology) have been analyzed by polarizing microscopy and scanning electron microscopy, separately. X-ray diffraction, Raman spectra, and curve-fitting enabled the quantitative examination of the microcrystalline structure. What is more, the microstrength and true density of each needle coke have also been examined in this study. It was concluded that a β resin content of 13–16% in the refined coal pitch achieved the best results and was optimal for needle coke production.

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Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Coal Pitch-Based Needle Coke (Part II): The Effects of β Resin in Refined Coal Pitch

Zhu

et al. 2020

Energy Fuels

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“…Liquid‐phase carbonization process is the inevitable process for the production of fine mosaic coke using MLP as the raw material. The liquid‐phase carbonization process plays an important role in deciding the quality of obtained fine mosaic coke, and this has attracted significant attention of researchers . Thus, the detailed analysis of thermal conversion behavior of MLP during the liquid‐phase carbonization process is critical to the production of high‐quality fine mosaic coke.…”

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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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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“…As presented in Fig. 6 (a), the most obvious diffraction peaks at 2θ ≈ 25.5° and 2θ ≈ 43.0°, corresponding to the d002-spacing and size of aromatic carbon layers, respectively, suggest that the mesophase pitches are highly crystalline [33]. The (002) aromatic carbon layer-planes' peak intensity increases as follows: C-MP < C/P-MP < P-MP, indicating that the stack height (Lc) and the number of aromatic molecular layers (N) increase in the same order, as shown in Table 4.…”

Section: Molecular Orientation and Microcrystalline Perfection Of The Mesophase Pitchesmentioning

confidence: 94%

Molecular Structure Control in Mesophase Pitch via Co-Carbonization of Coal Tar Pitch and Petroleum Pitch for Production of Carbon Fibers with Both High Mechanical Properties and Thermal Conductivity

Guo

et al. 2020

Energy Fuels

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Spinnable mesophase pitches C-MP, P-MP and C/P-MP were synthesized from coal tar pitch, petroleum pitch and their co-carbonized pitches, respectively. The molecular structures of these mesophase pitches and their effect on the microcrystalline sizes of the mesophase and the properties of carbon fibers derived from them were comparatively investigated. The molecular structures and orientation of the prepared mesophase pitches have significant influence on the performance of resultant carbon fibers. In comparison with P-MP and C/P-MP, C-MP possessing the highest aromaticity, a rigid molecular structure and a very small amount of methyl groups makes C-MP-CFs with smaller crystal size and lower decomposition during the preparation process, thus results in best mechanical properties of their carbon fibers, consequently. The prepared P-MP, however, containing abundant methyl groups

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Effects of different extracted components from petroleum pitch on mesophase development

Cited by 49 publications

References 27 publications

Preparation and Characterization of Coal Pitch-Based Needle Coke (Part II): The Effects of β Resin in Refined Coal Pitch

Preparation and Characterization of Coal Pitch-Based Needle Coke (Part II): The Effects of β Resin in Refined Coal Pitch

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

Molecular Structure Control in Mesophase Pitch via Co-Carbonization of Coal Tar Pitch and Petroleum Pitch for Production of Carbon Fibers with Both High Mechanical Properties and Thermal Conductivity

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