Monitoring the behaviour and fate of nickel and vanadium complexes during vacuum residue hydrotreatment and fraction separation
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Type
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Journal
Article
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Author
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Jérémie
Barbier
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Author
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Joao
Marques
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URL
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Volume
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119
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Pages
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185-189
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Publication
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Fuel
Processing Technology
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Date
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March
2014
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Abstract
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Researchers
monitored the size distribution of nickel and vanadium complexes by Size
Exclusion Chromatography separation (SEC) and Inductively Coupled Plasma Mass
Spectrometry (ICP/MS) detection, at various steps of vacuum residue
fractionation and hydrotreatment.
Sample preparation involved asphaltene/maltene separation, and asphaltene fractionation by cross-flow ultrafiltration. The asphaltene fractionation produced asphaltene fractions enriched in low and high molecular weight compounds. Researchers examined the impact of asphaltene's size on hydrotreatment reactivity. They then reconstituted a vacuum residue to monitor and control the fate of nickel and vanadium complexes through hydrotreatment. Results revealed that metals in the asphaltene fraction are associated with molecules that present a complex continuum of polydispersed compounds, with a majority of metal complexes found at 15 kDa polystyrene equivalent. |
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