Hydrodesulfurization and hydrodemetallization of different origin vacuum residues: New modeling approach

•The residue description gives a better differentiation of different origin residues.•The chemical kinetic and Maxwell–Stefan equations are coupled in the catalyst.•The diffusion limitation due to the molecule sizes improves the HDM prediction.•The vanadium HDM seems to be controlled by the diffusio...

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Bibliographic Details
Published in:Fuel (Guildford) 2014-08, Vol.129, p.267-277
Main Authors: Ferreira, C., Tayakout-Fayolle, M., Guibard, I., Lemos, F.
Format: Article
Language:English
Subjects:
API
Applied sciences
Catalysis
Chemical Sciences
Crude oil
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fuels
Gravitation
Hydrodemetallization
Hydrodesulfurization
Kinetic model
Mathematical models
Organic chemistry
Origins
Reaction kinetics
Reactor modeling
Residues
Vacuum residue
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Summary:•The residue description gives a better differentiation of different origin residues.•The chemical kinetic and Maxwell–Stefan equations are coupled in the catalyst.•The diffusion limitation due to the molecule sizes improves the HDM prediction.•The vanadium HDM seems to be controlled by the diffusion. In order to be able to upgrade the heaviest part of the crude oil one needs to remove several impurities, such as sulfur or metals. Residue hydrotreatment in fixed beds, under high hydrogen pressure can achieve high removal performances, with an industrial catalysts optimized staging. Despite the recent improvements, petroleum residues remain very difficult to describe and characterize in detail. Several kinetic models have been developed, but mostly they are feed dependant and their predictions are not satisfying for residues of different origins. Based on a recent study comparing residue properties and the differentiating physical–chemical properties responsible for reactivity (Ferreira et al., 2012), the present work develops a hydrotreatment kinetic model coupled with mass transfer in the catalyst which attempts to simulate the different residue performances. After estimation of kinetic parameters for a Iraqi residue (Buzurgan) with API gravity of 5, the model taking into account differences in residue characteristics, was validated for residues with API gravity close to Buzurgan one but shows increasing discrepancies with increasing API gravity.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2014.03.056