Structural characterization of semicokes produced from the pyrolysis of petroleum pitches

Öner, Firuze Okyay; Yürüm, Alp; Yürüm, Yuda

doi:10.1016/j.jaap.2014.12.023

Cited by 27 publications

(3 citation statements)

References 31 publications

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“…Curve‐fitting method was used to gain the relative proportion of different type carbons in these spinnable pitches. The attribution of chemical shift for different types of carbons was made according to the literature and is presented in Table .…”

Section: Methodsmentioning

confidence: 99%

Preparation and characterization of spinnable pitch for general‐purpose carbon fiber from refined pitch

Zhu

Zhao

et al. 2019

J of Applied Polymer Sci

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Four types of spinnable pitches (MP‐N‐A, MP‐A, MP‐A‐H, and MP‐A‐N) for general‐purpose carbon fiber have been prepared under certain conditions with the refined pitch as the raw materials. Fourier transform infrared spectrum and solid‐state nuclear magnetic resonance spectra combined with curve‐fitting analysis have been used to characterize the average molecular structure (Iar, CH3/CH2, SAR, and SHFG) of spinnable pitches. Thermogravimetric analyses and polarizing microscope have been used to observe the thermal stability and the microstructure of spinnable pitches, respectively. The X‐ray diffraction combined with curve‐fitting analysis have showed that, the stacking heights (Lc) of these four kinds of spinnable pitches were 2.21, 1.78, 1.79, and 1.76 nm, respectively. The parallel layers (N) of each spinnable pitch were 7.30, 6.02, 6.06, and 5.97. What is more, the numbers of aromatic ring in each layer (n) were 17.03, 11.61, 11.75, and 11.41. Finally, the scanning electron microscopy has been used to characterize the surface morphology of carbon fibers which obtained by each spinnable pitches. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47880.

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Section: Methodsmentioning

confidence: 99%

Preparation and characterization of spinnable pitch for general‐purpose carbon fiber from refined pitch

Zhu

Zhao

et al. 2019

J of Applied Polymer Sci

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“…The fitting peaks of the aromatic carbon region are shown in Figure 6 . The peaks around 120 ppm and 126 ppm were protonated aromatic carbon, while the peak at 137 ppm was substituted carbon and bridgehead carbon [ 29 , 30 ]. The aromatic carbon percentage of HI-TS-60 was increased to 78.68% (75.11% of HI-TS-0).…”

Section: Resultsmentioning

confidence: 99%

“…Figure 9 shows the 13 C-NMR spectra of the TI-THFS fraction of spinnable pitch after different incubation times, where the chemical shift near 125 ppm was aromatic carbon, the shift at 32 ppm was aliphatic carbon [ 19 , 29 , 30 ], and the sharp peaks in 25 and 67 ppm were the solvent peaks of THF. The fitting peak of aromatic carbon is shown in Figure 10 .…”

Section: Resultsmentioning

confidence: 99%

Evolution of the Composition and Melting Behavior of Spinnable Pitch during Incubation

Zuo

et al. 2023

Molecules

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The physical and chemical properties of spinnable pitch showed a huge impact on the performance of resultant pitch carbon fiber even if its physical and chemical properties were slightly changed. Various polycyclic aromatic compounds and abundant free radicals existed in spinnable pitch, and there are many interactions among molecules and free radicals. The molecular structure and composition of spinnable pitch were investigated during incubation, and the effect of molecular evaluation on rheological properties of spinnable pitch was illustrated using various characterization methods in this work. It indicated that n−hexane soluble fraction mainly occurred condensation or cleavage, and a small number of heavy components were generated after a long period. The fraction of n−hexane insoluble/toluene soluble underwent molecular condensation and cross−linking in the presence of oxygen−containing radicals and aromatic hydrocarbon radicals, while toluene insoluble/tetrahydrofuran soluble fraction tended to change in large molecules of polycyclic aromatic hydrocarbons. Lastly, tetrahydrofuran insoluble fraction was condensed due to its high aromaticity during the incubation process, and the content of aromatic carbon increased. These changes of composition and structure of spinnable pitch led to its softening point, increase in viscosity and flow activation energy, and deterioration of the rheological property.

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Thermal conversion mechanism and thermodynamics of mixed oil in coal‐based needle coke production

Cheng

Xin

Gao

et al. 2019

Asia-Pacific J Chem Eng

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In this work, the kinetic and thermodynamic parameters of mixed oil during the process of thermal conversion are analyzed using a kinetic model and thermodynamic calculations combined with thermogravimetric analysis. On the basis of the Flynn-Wall-Ozawa kinetic model, the calculated activation energies change in the reaction progress of mixed oil. Additionally, the thermal conversion process can be divided into three stages. The reaction mechanism is the exponential law mode in the first phase, and the latter two stages belong to the random nucleation and subsequent growth model, but they have completely different ways of nucleation and crystal growth. During the whole thermal conversion of mixed oil, △H ≠ > 0, and it does not show that the thermal conversion of mixed oil is a completely endothermic process; △G ≠ > 0 and represents a nonspontaneous reaction; and the change of the △S ≠ value is the most complicated.

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Structural characterization of semicokes produced from the pyrolysis of petroleum pitches

Cited by 27 publications

References 31 publications

Preparation and characterization of spinnable pitch for general‐purpose carbon fiber from refined pitch

Preparation and characterization of spinnable pitch for general‐purpose carbon fiber from refined pitch

Evolution of the Composition and Melting Behavior of Spinnable Pitch during Incubation

Thermal conversion mechanism and thermodynamics of mixed oil in coal‐based needle coke production

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