Study of carbonization using a tube bomb: evaluation of lump needle coke, carbonization mechanism and optimization

Mochida, Isao; Oyama, Takashi; Korai, Yozo; Fei, You Qing

doi:10.1016/0016-2361(88)90033-6

Cited by 45 publications

(26 citation statements)

References 36 publications

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“…Two methods were used to mix 1.8 wt % of dried filtered solids back into the solids-free vacuum residue: sonication and heating plus agitation. The data of Table 3 show that both samples gave the similar yields of coke and asphaltene to the solids-free vacuum coke yield ) m TI -m solids m feed -m solids (1) asphaltene yield ) m PI-TS m feed -m solids (2) oil yield ) m PS m feed -m solids (3) gas yield ) m gas m feed -m solids (4) Figure 1. Yield of asphaltenes and coke from reaction of Athabasca vacuum residue and solids-free Athabasca vacuum residue.…”

Section: Resultsmentioning

confidence: 85%

Role of Fine Solids in the Coking of Vacuum Residues

Tanabe

Gray

1997

Energy Fuels

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The yield of coke as a function of time was measured for vacuum residue from Athabasca in a batch reactor at 430°C. The presence of fine solids in the residue inhibited coke formation, delaying the onset of coking and reducing the yield of coke by as much as 7-9 yield % after 20-30 min. Similar trends were observed in coke formation from an asphaltene fraction of Athabasca bitumen. Experiments with an asphaltene fraction showed that coke yields at short reaction times were very sensitive to subtle changes in the reaction mixture. These results suggest that fine solids may help to disperse a coke-precursor phase at reactor conditions, preventing coalescence and thereby altering the rate of formation of solid coke.

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Section: Resultsmentioning

confidence: 85%

Role of Fine Solids in the Coking of Vacuum Residues

Tanabe

Gray

1997

Energy Fuels

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“…Such a practice covers a wide range of materials with different forms, including viscous distillation bottoms and pitches, solid coals and processed resides, for both industrial and laboratory processes. The liquefaction of coals and carbonization of pitches, thermal and catalytic cracking and coking of various residues from petroleum or coal processes are just a few examples where sequential extraction yields can provide helpful insights. The typical solvents used for the extraction of pitches include hexane/heptane (aliphatic), benzene/toluene (aromatic), tetrahydrofuran/pyridine (polar) and/or N‐methyl‐2‐ pyrrolidinone/quinolone ,…”

Section: Introductionmentioning

confidence: 99%

Sequential Extraction of Coal Tar Pitch and Structural Characterization of Enriched Large Polycyclic Aromatic Hydrocarbons

Fan

Chen

et al. 2019

ChemistrySelect

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Four fractions separated sequentially from a coal tar pitch by two different methods are examined by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI TOF-MS) and 50/24 matrix analysis, to evaluate both separation effectiveness and characteristics of large polycyclic aromatic hydrocarbons (PAHs) in variable fractions. Both Soxhlet extraction and anti-solvent precipitation can sequentially produce four fractions that have narrower molecular mass distribution with specific structural features of PAHs. The results show that the overall molecular mass (MM) and ring size of large PAHs abundant in the fractions gradually shift to higher values as solvent strength increases, with some overlap between two adjacent fractions. A broad range of peaks in MS spectra has been resolved as 4-to about 25-ring PAHs by 50/24 matrix analysis, with some detailed molecular structure elucidated. For example, the PAHs in the light HS fraction include 4 to 11-ring aromatics with more ortho-condensed structure. On the other hand, heavier fractions contain more aromatic rings fused by bay-condensations that result in quaternary aromatic carbons. Besides structural insights, SEM morphologically reveals differences in the extraction effectiveness between Soxhlet and antisolvent, due to mass transfer and diffusion limitations in bituminous material.

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“…Aromatic and naphthenic rings are favored for performing mesophase growth while hydrogen transfer of naphthenic rings is favored for arranging well-oriented flow texture in coke [31][32][33][34]. Long alkyl side chains, oxygen, sulphur functional groups are unfavorable because they can hamper mesophase growth, as do excessive size of aromatic rings [22].…”

Section: Feedstock Selectionmentioning

confidence: 99%

“…First, it is bulk mesophase formation of low viscosity through nucleation, growth and coalescence of mesophase spheres. The second step is uniaxial rearrangement of the bulk mesophase by aid of gas evolution [14,22]. In solidification stage, saturate compounds become the source of gas evolution in reordering molecules uniaxially.…”

Section: Feedstock Selectionmentioning

confidence: 99%

Preparation of needle coke from petroleum by-products

Halim¹,

Im²,

Lee³

2013

Carbon letters

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Needle coke is an important material for graphite electrodes. Delayed coking is used to produce needle coke. Producing good quality needle coke is not simple because it is a multi-parameter controlled process. Apart from that, it is important to understand the mechanism responsible for the delayed coking process, which involves mesophase formation and uniaxial rearrangement. Temperature and pressure need to be optimized for the different substances in every feedstock. Saturate hydrocarbon, aromatic, resin and asphaltene compounds are the main components in the delayed coking process for a low Coefficient Thermal Expansion value. In addition, heteroatoms, such as sulphur, oxygen, nitrogen and metal impurities, must be considered for a better graphitization process that prevents the puffing effect and produces better mesophase formation.

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Study of carbonization using a tube bomb: evaluation of lump needle coke, carbonization mechanism and optimization

Cited by 45 publications

References 36 publications

Role of Fine Solids in the Coking of Vacuum Residues

Role of Fine Solids in the Coking of Vacuum Residues

Sequential Extraction of Coal Tar Pitch and Structural Characterization of Enriched Large Polycyclic Aromatic Hydrocarbons

Preparation of needle coke from petroleum by-products

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