Modeling the hydrotreating reactions of a heavy residual oil in a pilot trickle-bed reactor

Iannibello, A.; Marengo, S.; Burgio, Gerlando; Baldi, Giancarlo; Sicardi, Silvio; Specchia, Vito

doi:10.1021/i200030a003

Cited by 19 publications

(6 citation statements)

References 3 publications

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“…On the basis of this sulfur conversion data, the different sulfur molecules were organized into seven groups. The kinetic parameters for HO1 were determined using parallel first-order kinetics for the seven groups wherein S p = product sulfur and S f = feed sulfur; x = 1−7; group 1 = sum of all thiophenes and benzothiophenes; group 2 = sum of all C 0 and C 1 dibenzothiophenes; group 3 = sum of all C 2+ dibenzothiophenes; group 4 = sum of all phenanthrothiophenes; group 5 = sum of all benzonapthothiophenes and five-ring thiophenes (compact); group 6 = sum of all five-ring thiophenes (extended) and six-ring thiophenes; and group 7 = sum of all nonaromatic sulfides; α = pressure-dependence term; LHSV = liquid hourly space velocity; k group( x ) = A group( x ) exp( − E group( x ) / RT ); k = rate constant; A = preexponential factor; and E = activation energy.…”

Section: Structure−reactivity Of Ho Sulfur Speciesmentioning

confidence: 99%

Structure−Reactivity−Mechanistic Considerations in Heavy Oil Desulfurization

Choudhary

2007

Ind. Eng. Chem. Res.

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In recent years, sulfur regulations for transportation fuels have been considerably tightened. Moreover, there has been an increasing trend to refine heavier crudes, which are typically more difficult to process. Because of these reasons, it is becoming increasingly important to enhance the desulfurization efficiency of commercial heavy oil hydrotreating units. A molecular level understanding about the reactivity of sulfur compounds in heavy oils is expected to assist the optimization of the heavy oil hydrotreaters. Unfortunately, the desulfurization chemistry in heavy oil range is enormously complex. As compared to the lower petroleum fractions such as gasoline/diesel, it is considerably more difficult to obtain a fundamental understanding about sulfur species in heavy oils. Studies dealing with fundamental aspects of heavy oil desulfurization have been addressed in this minireview. The following related topics have been reviewed: (a) characterization of sulfur compounds, (b) kinetics/reactivity of individual sulfur molecular groups, (c) mechanisms/pathways for desulfurization, and (d) model compound studies.

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Section: Structure−reactivity Of Ho Sulfur Speciesmentioning

confidence: 99%

Structure−Reactivity−Mechanistic Considerations in Heavy Oil Desulfurization

Choudhary

2007

Ind. Eng. Chem. Res.

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“…have been used alone or together with hydrogen as variables to represent reaction rates. The introduction of two lumps for characterizing the HDT reactions by dividing the whole compound into a reactive and refractory for the case of sulfur and asphalthenes, and basic and non-basic for the case of nitrogen has improved the description of kinetics [9,10]. Even more, dividing the mixture in a number of pseudocomponents seems to be the way of achieving more accuracy in the description of hydrotreatment reactions [11,12].…”

Section: Introductionmentioning

confidence: 99%

Modeling the performance of a bench-scale reactor sustaining HDS and HDM of heavy crude oil at moderate conditions

Rodrı́guez¹,

Elizalde²,

Ancheyta³

2012

Fuel

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“…This model assumes that the apparent rate constant is proportional to the external liquid holdup. Iannibello et al, 4 Tsamatsoulis et al, 5 and Froment et al 6 attempted to model the performance of trickle-bed reactors by assuming pseudohomogeneous kinetics. These models have limitations in application as they are based on a prior assumption of the appropriate kinetics and weak underlying theory.…”

Section: Introductionmentioning

confidence: 99%

Three-Phase Reactor Model to Simulate the Performance of Pilot-Plant and Industrial Trickle-Bed Reactors Sustaining Hydrotreating Reactions

Bhaskar

Valavarasu

Sairam

et al. 2004

Ind. Eng. Chem. Res.

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A three-phase heterogeneous model was developed to simulate the performance of pilot-plant and industrial trickle-bed reactors applied to the hydrodesulfurization of diesel fractions. The model is based on two-film theory and incorporates mass-transfer phenomena at the gas−liquid and liquid−solid interfaces. The major hydrotreating reactions, namely, hydrodesulfurization, hydrodenitrogenation, hydrodearomatization, saturation of olefins, and hydrocracking, were modeled. Detailed pilot-plant experiments were carried out in a continuous-flow trickle-bed reactor using feedstock and catalyst samples collected from an industrial reactor to determine kinetic parameters and to validate the model under various operating conditions. The reactor temperature was varied from 320 to 360 °C and the liquid hourly space velocity from 1.0 to 2.5 h-1 at a constant operating pressure of 4.0 MPa and a H2/oil ratio of 200 L/L. The three-phase heterogeneous model was solved to estimate kinetic parameters for various hydrotreating reactions using the data generated in pilot-plant experiments. A partial wetting model was proposed to account for incomplete wetting of the catalyst particles in pilot-plant reactors. The model simulations were found to agree well with the experimental data in the range of operating conditions studied. A three-phase nonisothermal heterogeneous model with complete catalyst wetting was applied to simulate the performance of an industrial reactor under various operating conditions using the kinetic parameters estimated from pilot-plant experiments. Temperature profiles in the industrial reactor were generated. The model was found to simulate the performance of the industrial reactor adequately. The model was also applied to study the influence of operating conditions such as reactor temperature and feed rate on product quality.

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Modeling the hydrotreating reactions of a heavy residual oil in a pilot trickle-bed reactor

Cited by 19 publications

References 3 publications

Structure−Reactivity−Mechanistic Considerations in Heavy Oil Desulfurization

Structure−Reactivity−Mechanistic Considerations in Heavy Oil Desulfurization

Modeling the performance of a bench-scale reactor sustaining HDS and HDM of heavy crude oil at moderate conditions

Three-Phase Reactor Model to Simulate the Performance of Pilot-Plant and Industrial Trickle-Bed Reactors Sustaining Hydrotreating Reactions

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