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Study of the role of the catalyst and operating conditions on the sediments formation during deep hydroconversion of vacuum residue

Paper ID Volume ID Publish Year Pages File Format Full-Text
41267 45883 2012 9 PDF Available
Title
Study of the role of the catalyst and operating conditions on the sediments formation during deep hydroconversion of vacuum residue
Abstract

The aim of this work is to investigate the influence of the catalyst and the operating temperature on the sediments formation occurring during vacuum residue hydroconversion. At high conversion, instability phenomena occurring due to carbonaceous sediments formation is a tricky issue to address and has detrimental effects on the operability of industrial units. The impact of the catalyst properties on this phenomenon has been scarcely studied. Therefore, a doped F doped NiMo/Al2O3 catalyst has been prepared and catalytic tests performed at two temperature levels (430 and 390 °C) in order to study the effect of catalytic hydrocracking or thermal conversion on the sediment formation. For both temperature regimes, it has been observed that the amount of sediments is strongly reduced with the F-NiMo catalyst compared to the undoped one and attributed to the improvement of the conversion of the sediment precursors (asphaltenes). This improvement is mostly due to the promotion of the acidic and hydrogenation functions by F addition. At 390 °C, coke deposition on F-NiMo catalyst is reduced which limits the plugging of the porous volume and preserve the intragranular diffusion of large molecules in the porosity. It has been shown that deep asphaltenes conversion can be achieved using an improved hydrogenation catalyst by reducing their polarity through the removal of heteroatoms and the saturation of some aromatic rings by hydrogen addition. The residual molecules exhibit lower interactions and self association ability resulting in a lower sediment formation.The temperature has also a great impact on the sediment formation in the effluents since the decrease of the temperature favors hydrogenation and catalytic hydrocracking route which is more appropriated to produce stable effluents compared to radical chemistry predominant at high temperature.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (184 K)Download as PowerPoint slideHighlights► Hydroconversion of vacuum residue. ► Fluorine effect on NiMo sulfide catalyst. ► Effect of catalyst and operating temperature on sediment formation. ► Asphaltenes and resins molecular structures.

Keywords
Hydroconversion; Vacuum residue; Sulfide catalyst; Fluorine; Effluent stability; Sediment formation; Asphaltenes; Resins
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Study of the role of the catalyst and operating conditions on the sediments formation during deep hydroconversion of vacuum residue
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 411–412, 16 January 2012, Pages 35–43
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us