Residue Hydrotreating Catalysts Catalysts for fixed-bed atmospheric and vacuum residue hydrodesulfurization units
Atmospheric and vacuum residue (AR/VR) desulfurisation prepares residue fluid catalytic cracking (RFCC) feeds and produces additional diesel and low sulfur fuels. Advanced residue hydrodesulfurization (RDS) improves conversion operations and squeezes the maximum out of the bottom-of-the-barrel, thus maximizes the refinery’s profitability.
Axens Offer
Axens offers a full range of first-rate RDS catalysts to improve RDS unit performance and economics. Axens latest generation residue catalysts enables refiners to:
- convert a part of the feedstock to diesel,
- produce low and ultra-low sulfur fuel oils,
- improve RFCC feed quality to limit RFCC catalyst consumption, to increase gasoline and propylene yields, and to improve product quality.
RDS units include a number of reactors in series, each with a dedicated function. These units require a tailored catalyst system characterized by three reaction zones where the types and quantities of each catalyst are determined as a function of the feedstock difficulty and the objectives of the unit: HDM (hydrodemetallization), Transition zone and HDS (hydrodesulfurization).
HDM (hydrodemetallization)
Hydrodemetallization (HDM) catalyst dedicated for the removal of metals, sediments and salts.
HMC 868
HMC 868 is used for the hydrotreatment of the heaviest cuts.
The special design of HMC 868 provides high levels of performance, even in very severe operating conditions, due to its high metal retention andimproved asphaltenes conversion activity activity.
HF 418
HF 418 is a top-performance hydrodemetallization (HDM) catalyst. It is specially designed for asphaltenes elimination. Thanks to its high HDM activity, even at a high metals retention rate, it is very well suited to protect the downstream catalysts from premature deactivation.
HF 418 can also be used advantageously to protect the main catalysts in VGO services.
HF 858
HF 858 is a top-performance hydrodemetallization (HDM) catalyst. HF 858 is the result of an extensive R&D program. Its carrier was specially designed for asphaltenes elimination.
Thanks to its high HDM activity, even at a high metals retention rate, HF 858 is very well suited to protect the downstream catalysts from premature deactivation. HF 858 can also be used advantageously to protect the main catalysts in VGO services.
Transition zone
Dual Activity catalysts loaded into the transition zone of the RDS Unit. These catalysts combine excellent metal retention characteristics and a very high HDS activity.
HM 428
HM 428 is a transition catalyst, exhibiting the highest performance for this service. Thanks to its unique texture, it is perfectly adapted to treat smaller asphaltenes or partially cracked asphaltenes escaping from the upper layer, in order to complete the demetallization reactions.
Thanks to its higher hydrotreatment activity, HM 428 is very efficient in initiating HDS and HDN reactions. HM 428 can also be used advantageously to protect the main catalysts in VGO services.
HM 848
HM 848 is a transition catalyst, exhibiting the highest performance for this service. Thanks to its unique texture, it is perfectly adapted to treat smaller asphaltenes or partially cracked asphaltenes escaping from the upper layer, in order to complete the demetallization reactions.
Thanks to its higher hydrotreatment activity, HM 848 is very efficient in initiating HDS and HDN reactions. HM 848 can also be used advantageously to protect the main catalysts in VGO services.
HDS (hydrodesulfurization)
High performance and very stable catalysts enabling deep HDS, hydrodenitrogenation (HDN) and Conradson Carbon reduction through hydrogenation (HDCCR).
HT 438
Made with Advanced Catalyst Engineering (ACE) technology, HT 438 is remarkably active and specially designed for the HDS zone, where HDS, HDN and HDCCR conversion are maximized.
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