Catalytic Hydrocracking of a Bitumen‐Derived Asphaltene over NiMo/γ‐Al2O3 at Various Temperatures

Zhao, Yongjie; Lin, Xianfu; Li, Da

doi:10.1002/ceat.201300139

Cited by 10 publications

(8 citation statements)

References 35 publications

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“…The deposition of the asphaltenic phase could occur in different places, including reservoir, wellbore flow lines or processing facilities. It may lead to potential issues such as permeability damage of reservoirs, plugging in production tubing, and deactivation of catalyst in bitumen hydroprocessing. − Asphaltene phase partition is the necessary condition but not the sufficient condition for asphaltene deposition . The partitioned asphaltenic phase is not necessarily deposited on the exact spot it is generated, and it could be transferred downstream or even produced along with effluent oil.…”

Section: Discussionmentioning

confidence: 99%

Viscous Oil Recovery and In Situ Deasphalting in Fractured Reservoirs: Part 1. The Effect of Solvent Injection Rate

et al. 2018

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Steam-based EOR methods for viscous oil recovery from fractured reservoirs have significant challenges in both cost and energy efficiency. In response, solvent-based methods have been of interest because of their low energy intensity, low greenhouse gas emissions, and no fresh water consumption. Injection strategies for viscous oil recovery by solvent include liquid extraction and vapor oil gravity drainage. Understanding the mechanisms in each phase is of great value for the successful application and optimization of solvent EOR processes. The work presented here studies the effect of solvent injection rate on viscous oil recovery by liquid extraction with n-butane in vertically placed sandstone cores with an artificial fracture. The oil production rate, ultimate recovery, and in situ deasphalting in different sections of the core are analyzed. The oil production rate increased with solvent injection rate until it leveled off as the injection rate exceeded a critical value. The ultimate recovery factor is nearly the same for all solvent injection rates below the critical value. However, it is significantly reduced at higher injection rates. A conceptual model based on convective mass transfer is proposed and the effect of mechanical dispersion is discussed. In situ deasphalting was observed in all cases. The cause of the unexpected changes in production rate was attributed to severe asphaltene deposition and remobilization in the fractured permeable rock. In such a medium, solvent injection rate seems to show an optimal value for maximizing oil production rate, ultimate recovery factor, and solvent efficiency.

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Section: Discussionmentioning

confidence: 99%

Viscous Oil Recovery and In Situ Deasphalting in Fractured Reservoirs: Part 1. The Effect of Solvent Injection Rate

et al. 2018

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“…Great efforts have also been made to investigate the kinetic behavior of asphaltene conversion under different processes, including thermal cracking, − thermal hydrocracking, catalytic hydrocracking, , and thermal cracking in supercritical water (SCW) . However, the kinetics of asphaltene conversion under non-catalytic hydrogenation conditions, such as selecting THN as a hydrogen donor, were seldom investigated.…”

Section: Introductionmentioning

confidence: 99%

Seven-Lump Kinetic Model for Non-catalytic Hydrogenation of Asphaltene

et al. 2017

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Non-catalytic hydrogenation with a hydrogen donor is a beneficial way for effective conversion of asphaltene to distillate with minimal coke formation. In this work, detailed product distribution, which includes gas, light oil [initial boiling point (IBP)–350 °C], middle oil (350–540 °C), heavy oil (>540 °C), asphaltene, and coke, obtained from non-catalytic hydrogenation of asphaltene with tetralin as a hydrogen donor, was investigated in an autoclave. The effects of reaction conditions, including reaction time, reaction temperature, and hydrogen donor/asphaltene weight ratio, on asphaltene conversion, detailed product distribution, liquid product yield, and liquid product selectivity were studied. Results showed that through controlling the reaction condition, asphaltene conversion and total liquid yield reached 72.72 and 70.34 wt %, respectively, and produced only 2 wt % coke and 0.34 wt % gas. We then developed a seven-lump kinetic model, including an active hydrogen lump to describe the reaction behaviors of asphaltene hydroliquefaction. Activation energies ranged from 106.07 to 237.50 kJ mol–1. The activation energies of the main reaction that asphaltene decomposed and hydrogenated by active hydrogen to produce heavy oil and middle oil were 106.07 and 109.06 kJ mol–1, respectively, which were lower than those of thermal cracking. The activation energy of distillate formation from active hydrogen combined with macromolecule radicals was 143.78 kJ mol–1. The detailed product yield predicted by the developed seven-lump kinetic model exhibited good consistency with the experimental data.

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“…In order to evaluate the activity of the prepared catalyst, the catalytic conversion of crude palm oil (500 cm 3 ) was performed in batch reactor with a volume of 1 L. 5 g catalyst was fed into the reactor. The mixture was automatically and continuously stirred at 500 rpm.…”

Section: Catalytic Hydrocrackingmentioning

confidence: 99%

“…Generally, this process involves the utilization of commercially available catalysts and is operated at temperature above 450°C. Hence, the development of new catalysts, with higher activity under lower temperature conditions, is needed to improve the product yield of palm oil conversion 3,4 .…”

Section: Introductionmentioning

confidence: 99%

Effect of NiW Modified HZSM-5 and HY Zeolites on Hydrocracking Conversion of Crude Palm Oil to Liquid Hydrocarbons

Subsadsana¹,

Ruangviriyachai²

2016

Orient. J. Chem

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The catalytic conversion of crude palm oil over HZSM-5 and HY zeolites modified with NiW as catalysts in the hydrocracking process was investigated. These zeolites supported by NiW catalysts were prepared employing the impregnation technique. NiW was added to the zeolites in order to induce bi-functional properties (both acid and metal sites) in the catalysts. Subsequently, the catalysts were characterized by X-ray diffraction spectrometry (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), ammonia temperature programmed desorption (NH 3 -TPD) and nitrogen adsorption-desorption isotherms analysis. The catalytic activity of prepared catalysts was evaluated through the conversion of crude palm oil to biofuels. These results indicate that the incorporation of NiW over HZSM-5 and HY zeolites improves the conversion efficiency and enhances the yield of biofuel (gasoline, kerosene, and diesel), possibly due to NiW promote of hydrogenation and dehydrogenation reaction.

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Catalytic Hydrocracking of a Bitumen‐Derived Asphaltene over NiMo/γ‐Al₂O₃ at Various Temperatures

Cited by 10 publications

References 35 publications

Viscous Oil Recovery and In Situ Deasphalting in Fractured Reservoirs: Part 1. The Effect of Solvent Injection Rate

Viscous Oil Recovery and In Situ Deasphalting in Fractured Reservoirs: Part 1. The Effect of Solvent Injection Rate

Seven-Lump Kinetic Model for Non-catalytic Hydrogenation of Asphaltene

Effect of NiW Modified HZSM-5 and HY Zeolites on Hydrocracking Conversion of Crude Palm Oil to Liquid Hydrocarbons

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