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Distillate Hydrotreating to Ultra-low-sulfur Diesel - the Impact of Aromatics

Distillate hydrotreating has become a key concern in the refining industry owing to ultra-low-sulfur diesel legislation. Rate-limiting parameters that had previously been overlooked, such as aromatic inhibition, may need to be considered for the production of ultra-low-sulfur diesel (

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Published in:Indian chemical engineer (Calcutta, India : 1997) India : 1997), 2011-09, Vol.53 (3), p.152-169
Main Authors: Banerjee, Soumendra, Mani, Krishna, Leonard, Laura, Kokayeff, Peter
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Language:English
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cited_by cdi_FETCH-LOGICAL-c368t-5f87532a1940f21b723acf38214e141190d3a7befc226adb2fc849f6547417e03
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description Distillate hydrotreating has become a key concern in the refining industry owing to ultra-low-sulfur diesel legislation. Rate-limiting parameters that had previously been overlooked, such as aromatic inhibition, may need to be considered for the production of ultra-low-sulfur diesel (
doi_str_mv 10.1080/00194506.2011.696372
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However, the magnitude of the changes was insufficient to conclude that the competition for hydrogen was the sole mechanism needed to explain the suppression of HDS activity. Furthermore, the pilot plant data indicated that the presence of poly-aromatics has a more significant impact on the slower HDS reactions (sterically hindered dibenzothiophenes). As a result, it was concluded that aromatics inhibition (competitive adsorption on catalyst sites) impacted the rate of HDS most significantly. 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However, the magnitude of the changes was insufficient to conclude that the competition for hydrogen was the sole mechanism needed to explain the suppression of HDS activity. Furthermore, the pilot plant data indicated that the presence of poly-aromatics has a more significant impact on the slower HDS reactions (sterically hindered dibenzothiophenes). As a result, it was concluded that aromatics inhibition (competitive adsorption on catalyst sites) impacted the rate of HDS most significantly. 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Rate-limiting parameters that had previously been overlooked, such as aromatic inhibition, may need to be considered for the production of ultra-low-sulfur diesel (&lt;10 weight parts per million wppm sulfur). As hydrodesulfurization (HDS) and aromatic saturation (HDA) reactions occur in parallel in a shared environment, they compete for the necessary resources, namely, hydrogen and catalyst sites. A series of pilot plant and numerical simulation experiments were completed in order to explore how the competition for hydrogen and catalyst sites impacts the rate of HDS in the presence of poly-cyclic aromatics. A diagnostic pilot plant test showed that external mass transfer was not rate-limiting. Intra-particle mass and energy transport were investigated by calculating the concentration and temperature gradients in a catalyst pellet. The effectiveness factors for HDS and HDA decreased in the presence of increased aromatics concentrations. However, the magnitude of the changes was insufficient to conclude that the competition for hydrogen was the sole mechanism needed to explain the suppression of HDS activity. Furthermore, the pilot plant data indicated that the presence of poly-aromatics has a more significant impact on the slower HDS reactions (sterically hindered dibenzothiophenes). As a result, it was concluded that aromatics inhibition (competitive adsorption on catalyst sites) impacted the rate of HDS most significantly. Although the consequences were significant, the impact of aromatic inhibition was minor relative to the analogous nitrogen inhibition.</abstract><cop>New Delhi</cop><pub>Taylor &amp; Francis Group</pub><doi>10.1080/00194506.2011.696372</doi><tpages>18</tpages></addata></record>
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source Taylor and Francis:Jisc Collections:Taylor and Francis Read and Publish Agreement 2024-2025:Science and Technology Collection (Reading list)
subjects Aromatic Inhibition
Catalysts
Competition
Diesel
Diesel fuels
Distillate Hydrotreating
Distillation
Environmental regulations
Hydrodesulfurization
Inhibition
Kinetics
Mathematical models
Nitrogen Inhibition
Pilot plants
Sulfur
Ultra low sulfur Diesel
title Distillate Hydrotreating to Ultra-low-sulfur Diesel - the Impact of Aromatics
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