Relationships between the characteristics of petroleum feedstocks and the graphitizability of the petroleum cokes

Kakuta, Mitsunao; Kohriki, Masato; Sanada, Yuzo

doi:10.1007/bf00550583

Cited by 6 publications

(3 citation statements)

References 7 publications

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“…Heavy oil can be used to produce coke for ironmaking and steelmaking or to produce needle coke as a negative electrode material. [ 11–13 ]…”

Section: Introductionmentioning

confidence: 99%

“…Heavy oil can be used to produce coke for ironmaking and steelmaking or to produce needle coke as a negative electrode material. [11][12][13] VR is the part with the highest boiling point, the largest molecular weight, the highest heteroatom content, and the most complex structure in crude oil. [14] Hydrocracking technology can not only effectively transform heavy oil into high-quality light oil but also effectively remove metals and heteroatoms.…”

Section: Introductionmentioning

confidence: 99%

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Study on molecular structure and association behaviour of heavy subfractions of vacuum residue by an improved separation method

Tian

Han²,

et al. 2022

Can J Chem Eng

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Vacuum residue (VR) is the most complex component of crude oil. Due to the special structure of heavy subfractions, physical aggregation and chemical coking reactions easily occur through molecular force, which affects the normal processing. Therefore, in‐depth study and analysis of their composition, structure and association behaviours are particularly important. In view of the shortcomings of the traditional separation method in terms of separation accuracy, mainly including the purification of asphaltenes and the poor separation of resins. In this paper, a reasonably improved separation method is adopted, and the multi‐stage asphaltene extraction and the multi‐stage silica gel coupling separation are carried out innovatively, which achieves a high yield of 99% while ensuring the separation accuracy. The samples were characterized by elemental analysis (EA), gel permeation chromatography (GPC), Fourier‐transform infrared spectroscopy (FT‐IR), hydrogen nuclear magnetic resonance spectroscopy (1H‐NMR), X‐ray photoelectron spectroscopy (XPS), X‐ray diffraction (XRD), and scanning electron microscope (SEM) to study their structural characteristics and association behaviours. The results show that the main forms of heteroatoms in asphaltene and resin surface are C‐O‐C, C‐OH, pyridine, pyrrole, and thiophene, and the content of these substances is higher in asphaltene. Compared with resins, asphaltenes contain a more peri‐condensed aromatic structure and shorter alkyl substituent side chains. By studying the hydrogen bond and acid–base interaction, it is found that asphaltene and resin mainly contain OH‐OH, OH‐π, and OH‐ether O, of which the content of OH‐OH is the highest. Asphaltene and resin have more neutral and basic substances. These hydrogen bonds and acid–base interactions caused by heteroatoms are the main forces for the association of the heavy subfractions of the VR.

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“…Heavy oil can be used to produce coke for ironmaking and steelmaking or to produce needle coke as a negative electrode material. [ 11–13 ]…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on molecular structure and association behaviour of heavy subfractions of vacuum residue by an improved separation method

Tian

Han²,

et al. 2022

Can J Chem Eng

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“…Similar researches are in preparation of carbon materials from pitch, such as mesocarbon microbeads (MCMB) at 300–500 °C, which involves pyrolysis and polymerization of asphaltenes. The processes include growth of aromatic structure, , removal of heteroatoms (O, N and S) in the form of light fractions, and increase in viscosity . During processing of petroleum residues, the properties of coke deposited on hydrotreating catalysts also change with operating time and temperature.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Coke Formed during Thermal Reaction of Tar

Liu

Jiang

et al. 2016

Energy Fuels

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Coking of volatiles generated from coal in pyrolysis has been a focal issue in coal pyrolysis and upgrading of coal tar, but limited work can be found in the literature on evolution of coke in composition and structure under the pyrolysis conditions. This work characterizes the coke formed in reaction of a subbituminous coal tar at 300, 400, and 500 °C in 40 min in a semibatch system which allows natural evaporation of light fractions. The coke is categorized into two types, the one suspended in tetrahydrofuran (THF), coke-S, and the one deposited on the wall of tube reactor, coke-D. It is found that coke-D accounts for 70–85% of total coke. With increasing tar reaction temperature and time the quantity of coke increases from 1.0% to 16.3 wt % and the particle size of coke-S increases from a most probable size of approximately 0.1 to 700–800 μm. This change is accompanied by reduction in alkyl side chains and heteroatoms (O, N, and S), as well as the enrichment in the aromatic Car–Car bond, which lead to a decrease in H/C ratio from 0.9 to 0.6 and increase in aromaticity f a from 0.70 to 0.86. The carbon distribution in coke-S is similar to that in bituminous coals and is composed of 3–7 fused aromatic rings. The changes in coke-S also include increase in radical concentration and decreases in the radicals’ g value and line width, indicating continued pyrolysis and condensation of the coke due to the removal of oxygen atoms and side chains on the aromatic structure. When compared with coke-S, coke-D formed under the same conditions is more condensed as indicated by higher radical concentration and lower g value and line width. The morphological change in coke-D includes transformation of small irregular particles to spherical-like particles and to coke film that crack in 30 min at 300 °C or 10 min at 500 °C.

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Thermo‐Physical Properties of Petroleum Coke during Calcining Graphitization Process

Long¹,

Sheng²,

Liu³

et al. 2015

Drying, Roasting, and Calcining of Minerals

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Relationships between the characteristics of petroleum feedstocks and the graphitizability of the petroleum cokes

Cited by 6 publications

References 7 publications

Study on molecular structure and association behaviour of heavy subfractions of vacuum residue by an improved separation method

Study on molecular structure and association behaviour of heavy subfractions of vacuum residue by an improved separation method

Characterization of Coke Formed during Thermal Reaction of Tar

Thermo‐Physical Properties of Petroleum Coke during Calcining Graphitization Process

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