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.

Residue Hydrotreating Catalysts

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).

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Speciality Bed Topping

In Hydroprocessing reactors, pressure drop is mainly induced by particulates build-up and gum formations. Pressure drop not only affect the capacity of the unit but can also have detrimental impact on the distribution.


Gums & Polymer formation control

Pressure drop induced by gum formation is frequently encountered in unit processing some cracked feedstock derived from various conversion processes. The olefins and mainly the diolefins contained in these streams tend to polymerize and get oxidized forming a crust which deposit in the upper layers of the reactor.


Nickel & Vanadium Management

Nickel and vanadium are naturally present in Crude Oil and usually in fractions boiling over 500°C. Nickel and vanadium poisoning affect only VGO and resid hydrotreaters and hydrocrackers.


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