Plugging problems observed in severe hydrocracking of vacuum residue

Pang, Wei Wei; Kuramae, Masahito; Kinoshita, Yoshinori; Lee, Jihn Koo; Zhang, Yu Zhen; Yoon, Seong Ho; Mochida, Isao

doi:10.1016/j.fuel.2008.09.020

Cited by 27 publications

(10 citation statements)

References 17 publications

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“…However, two main problems need to be considered for the DOA's solid particles gasification process [7]: (1) the gasification temperature is higher than the DOA melting temperature. Thus, introducing the material into the gasifier is a main challenge, as the DOA particles might melt and possible plug the feeding system [8,9]. So the traditional feeding methods applied by coal or biomass are not suitable for DOA gasification [10].…”

Section: Introductionmentioning

confidence: 99%

Preliminary study on co-gasification behavior of deoiled asphalt with coal and biomass

Zhang

et al. 2014

Applied Energy

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Section: Introductionmentioning

confidence: 99%

Preliminary study on co-gasification behavior of deoiled asphalt with coal and biomass

Zhang

et al. 2014

Applied Energy

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“…where T i is absolute boiling point (Tb), in K; x i is the cumulative weight fraction; T 0 is the boiling point at x i = 0; and A and B are boiling point distribution model parameters. During the estimation, T 0 was the fitting parameter that provided the best agreement between measured boiling points and those estimated by Equation (2).…”

Section: Methodsmentioning

confidence: 99%

“…The inclination of some compounds to aggregate and precipitate is the most Energies 2022, 15, 1755 2 of 25 challenging process characteristic of vacuum residues. The aggregation and sedimentation are associated with a shorter process unit cycle length and unplanned shutdowns with huge loss of profit opportunity for oil refining [1][2][3]. The lower fluidity and volatility make vacuum residues difficult to analyze.…”

Section: Introductionmentioning

confidence: 99%

Empirical Modeling of Viscosities and Softening Points of Straight-Run Vacuum Residues from Different Origins and of Hydrocracked Unconverted Vacuum Residues Obtained in Different Conversions

et al. 2022

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The use of hydrocracked and straight-run vacuum residues in the production of road pavement bitumen requires a good understanding of how the viscosity and softening point can be modeled and controlled. Scientific reports on modeling of these rheological properties for hydrocracked and straight-run vacuum residues are scarce. For that reason, 30 straight-run vacuum residues and 33 hydrocracked vacuum residues obtained in a conversion range of 55–93% were investigated, and the characterization data were employed for modeling purposes. An intercriteria analysis was applied to investigate the statistically meaningful relations between the studied vacuum residue properties. It revealed that the straight-run and hydrocracked vacuum residues were completely different, and therefore their viscosity and softening point should be separately modeled. Through the use of nonlinear regression by applying CAS Maple and NLPSolve with the modified Newton iterative method and the vacuum residue bulk properties the viscosity and softening point were modeled. It was found that the straight-run vacuum residue viscosity was best modeled from the molecular weight and specific gravity, whereas the softening point was found to be best modeled from the molecular weight and C7-asphaltene content. The hydrocracked vacuum residue viscosity and softening point were modeled from a single property: the Conradson carbon content. The vacuum residue viscosity models developed in this work were found to allow prediction of the asphaltene content from the molecular weight and specific gravity with an average absolute relative error of 20.9%, which was lower of that of the model of Samie and Mortaheb (Fuel. 2021, 305, 121609)—32.6%.

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“…Fast catalyst deactivation is one of the greatest drawbacks of heavy oil hydrocracking processes, since it shortens the operating cycle of fixed-bed reactors or increases catalyst consumption in moving-bed, ebullated-bed, and slurry-bed reactors. Moreover, hydrocracking conversion is limited by the formation of sediments, which deposit on the catalyst surface and cause deactivation and also gradually deposit on process equipment, causing fouling problems that can lead to plant shutdown. − Formation of sediments is induced by high reaction temperature and also by high residence time: large hydrocarbons diffuse more slowly in catalyst pores, and this increases the exposure time in the catalyst, which can be an important factor for sediment formation.…”

Section: Introductionmentioning

confidence: 99%

Heavy Oil Hydrocracking on a Liquid Catalyst

García

Juárez

2017

Energy Fuels

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Heavy crude oil was upgraded into a lighter oil by means of hydrocracking on an acidic Mo–Ni liquid catalyst. Upgrading was measured in terms of specific gravity, viscosity, and distillates yield. The experimental results show that heavy crude oil was upgraded to an extent that depends on the severity of the reaction conditions; in all cases the hydrocracked oil was lighter, less viscous, and richer in valuable distillates (up to 60 wt % more) and contained less contaminants (sulfur and nitrogen) than the heavy crude oil. Hydrocracking experiments were carried out in a batch reactor that was operated at typical hydrocracking conditions, and the conversion was varied by modifying the reaction time over a range from 30 to 90 min or the reaction temperature from 350 to 450 °C. The formation of sediments and toluene-insoluble hydrocarbons increased as the reaction severity and conversion were higher; however, the values obtained were small and lower than those obtained with a commercial heterogeneous catalyst, and in both cases no precipitation was observed. Comparison versus an industrial heterogeneous catalyst under the same reaction conditions indicates that the performance of the liquid catalyst was better in terms of heavy molecules cracking but not as good in terms of contaminant removal.

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Plugging problems observed in severe hydrocracking of vacuum residue

Cited by 27 publications

References 17 publications

Preliminary study on co-gasification behavior of deoiled asphalt with coal and biomass

Preliminary study on co-gasification behavior of deoiled asphalt with coal and biomass

Empirical Modeling of Viscosities and Softening Points of Straight-Run Vacuum Residues from Different Origins and of Hydrocracked Unconverted Vacuum Residues Obtained in Different Conversions

Heavy Oil Hydrocracking on a Liquid Catalyst

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