Hydrotreating of FCC decant oil as a needle coke feedstock.

Tanabe, K.; Takada, Tomonori; Newman, Bruce A.; Satou, Masaaki; Hattori, Hideshi

doi:10.3775/jie.75.916

Cited by 5 publications

(7 citation statements)

References 1 publication

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“…1 Its formation is aided by the use of highly aromatic, low-sulfur feeds such as FCC decant oil and by careful control of process temperatures. [2][3][4] The formation of coke is usually attributed to condensation and polymerization of aromatic components, eventually giving a carbon-rich material. Unfortunately, the terminology for heavy hydrocarbon pitches and cokes is a confusing mix of definitions that depend on operational definitions such a solubility in a solvent.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

Role of Fine Solids in the Coking of Vacuum Residues

Tanabe

Gray

1997

Energy Fuels

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“…Both tests were performed at a catalyst bed temperature of 395 °C. In 1996, Tanabe et al also reported the same reduction in H 2 uptake when HDS of decant oil occurred at 400 °C …”

Section: Resultsmentioning

confidence: 83%

“…In 1996, Tanabe et al also reported the same reduction in H 2 uptake when HDS of decant oil occurred at 400 °C. 19 3.5. Dependence of Coke Quality on the Extent of HDS.…”

Section: Energy and Fuelsmentioning

confidence: 99%

Hydrodesulfurization of Fluid Catalytic Cracking Decant Oils in a Laboratory Flow Reactor and Effect of Hydrodesulfurization on Subsequent Coking

2016

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This study investigates the hydrodesulfurization (HDS) of fluidized catalytically cracked decant oils used as feedstock for needle coke production. Three decant oils, representing a high (4.0 wt %), medium (2.5 wt %), and low (0.9 wt %) sulfur content, were hydrotreated in a fixed-bed flow reactor. Removing sulfur from larger ring systems in decant oils is the most effective way of reducing the needle coke sulfur content, because large aromatics are significant contributors to the coke product obtained from delayed coking. Two commercial catalysts with different pore size distributions were tested for their hydrodesulfurization activities, selectivities for specific sulfur-containing species, and hydrogenation of constituent polyaromatic hydrocarbons (PAHs) under different operating conditions. The decant oils and hydrotreated products were analyzed by GC/ MS to determine changes in molecular compositions of the feedstocks. Following HDS, the decant oils and their hydrotreated products were carbonized to produce a semicoke, and the coke was evaluated for mesophase formation and quality. The desirable outcome of decant oil HDS is sulfur removal, particularly from large polyaromatic ring systems, with minimum hydrogen consumption and hydrogenation. The results showed that the desired level of 0.5 wt % of sulfur in both low-and medium-sulfur decant oils could be achieved through HDS over a commercial CoMo catalyst. Furthermore, hydrogenation of the PAH during HDS appeared to slightly improve the mesophase development seen upon subsequent carbonization.

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“…Since SLO is enriched with 3-5 rings of polycyclic aromatic hydrocarbons (PAHs) with short side chains, it is widely known as an excellent potential raw material to produce mesophase pitch and needle coke, which could heighten its utilization value remarkably [2][3][4]. Nevertheless, the impurities in SLO could seriously deteriorate the quality of the prepared carbonaceous material, among which sulfur and olefins are the most critical factors [5][6][7]. The sulfur in needle coke with a content higher than 0.5 wt% can cause irreversible volume expansion (i.e., puffing) during graphitization heat treatment, reducing the strength and electrical conductivity of the electrodes [8,9].…”

Section: Introductionmentioning

confidence: 99%

Molybdenum Carbide and Sulfide Nanoparticles as Selective Hydrotreating Catalysts for FCC Slurry Oil to Remove Olefins and Sulfur

et al. 2021

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As the two types of major impurities in FCC slurry oil (SLO), olefins and sulfur seriously deteriorate the preparation and quality of mesophase pitch or needle coke. The development of a hydrotreatment for SLO to remove olefins and sulfur selectively becomes imperative. This work presents the potentiality of dispersed Mo2C and MoS2 nanoparticles as selective hydrotreating catalysts of SLO. Mo2C was synthesized by the carbonization of citric acid, ammonium molybdate and KCl mixtures while MoS2 was prepared from the decomposition of precursors. These catalysts were characterized by XRD, HRTEM, XPS, BJH, BET, and applied to the hydrotreating of an SLO surrogate with defined components and real SLO. The conversion of olefins, dibenzothiophene and anthracene in the surrogate was detected by GC-MS. Elemental analysis, bromine number, diene value, 1H-NMR and spot test were used to characterize the changes of the real SLO. The results show that hydrotreating the SLO surrogate with a very small amount of Mo-based nanoparticles could selectively remove olefins and sulfur without the overhydrogenation of polyaromatics. Mo2C exhibited much better activity than MoS2, with 95% of olefins and dibenzothiophene in the surrogate removed while only 15% anthracene was hydrogenated. The stability of the real SLO was significantly improved. Its structural parameters changed subtly, proving the aromatic macromolecules had been preserved.

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Hydrotreating of FCC decant oil as a needle coke feedstock.

Cited by 5 publications

References 1 publication

Role of Fine Solids in the Coking of Vacuum Residues

Role of Fine Solids in the Coking of Vacuum Residues

Hydrodesulfurization of Fluid Catalytic Cracking Decant Oils in a Laboratory Flow Reactor and Effect of Hydrodesulfurization on Subsequent Coking

Molybdenum Carbide and Sulfide Nanoparticles as Selective Hydrotreating Catalysts for FCC Slurry Oil to Remove Olefins and Sulfur

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