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Diesel Hydrotreating

Refiners are facing the challenge to process increasingly more difficult feeds, with higher cracked stock fractions, and low-cost feedstocks from opportunity crude such as tight oil or condensates.

As refineries in almost all regions of the world progressively comply to Euro V norms, diesel hydrotreaters have to be operated under more severe conditions. To address the refiners’ needs and constraints to operate under these conditions, advanced catalysts systems and advanced design features are required

Axens Offer

To keep pace with these challenges, Axens continuously develops their Prime-D™ offer, a full set of commercially proven technologies covering all objectives, ensuring minimum investment and operating costs, for maximum reliability and performances:

  • Prime-D™ spans over 60 years
  • Over 270 licensed units around the world
  • Over 500 catalyst references around the world.
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Conventional Prime-D™

Conventional Prime-D™ ensures achievement of ultra-low sulfur diesel (ULSD) specification, density and cetane improvement over a large range of diesels cuts: from straight run to large cracked feedstocks.

ULSD achievement moderate cetane/density improvement
Over 180 references in ULSD service
Related Offer
Modular Unit Catalyst Protection Systems
prime-d

Prime-D™ with dewaxing

In addition to reaching ultra-low sulfur content, cold flow properties and specifications of the diesel product may have to be improved due to local climatic constraints.

Prime-D™ with dewaxing is a competitive alternative for cold flow properties improvement as compared to more costly options such as feed undercutting, kerosene blending, or chemical additive addition, leading to high operating costs and loss in diesel yield.

Low cost option
Maximize diesel yield
Related Offer
Modular Unit Catalyst Protection Systems

Prime-D™ with cracking

While having to handle heavier diesel cuts, the refiner has to address the demand for more gasoline for the fuel market or for petrochemicals production downstream.

Consequently, the middle distillates hydrotreatment target is evolving to bring sufficient flexibility to the products properties as well as yields adjustment. To this end, deep optimization of cracking and hydrotreatment catalyst systems are required.

Prime-D™ with cracking is the optimal solution when deep hydrogenation is not enough to reach stringent specifications on density and/or cetane for refractory feedstocks, or when additional gasoline production is desired.

Ultimate Cetane & density improvement for refractory feedstocks
T95 reduction
Related Offer
Modular Unit Catalyst Protection Systems

Prime-D™ with renewable lipids co-processing

Due to several factors, mineral diesel fuels are being progressively substituted by renewable ones. As such, production of renewable diesel by co-processing of bio-feedstock with fossil diesel component is a new challenge to face.

Based on strong R&D programs, dedicated to Vegetable Oil conversion, Axens has developed a dedicated Prime-D™ offer for Vegetable Oil co-processing, in combination with Gasoil streams, to help clients optimize the use of their HDT units.

Axens has a long experience with the processing of renewable feedstocks:

  • Through its cumulated 25 years of R&D experience in lipid feedstock processing, for the production of first generation of Biodiesel (technology pioneered by Axens, with the Esterfip/Esterfip-H suite)
  • Axens is the licensor of the well-known Vegan® technology, which is a commercially available process for the production of renewable drop-in fuels (Diesel or Jet) from 100% lipid sources, using HDT technology.
Enhance the production of blended drop-in biofuels
Commercial Bulletin
Related Offer
Modular Unit Catalyst Protection Systems
Catalysts

Middle Distillates & Naphtha Hydrotreating Catalysts

Axens’ portfolio has a complete, high performance range of hydrotreating catalysts allowing for increasingly more difficult feedstock to be processed without cycle penalty.

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Gradings

Arsenic Management

Arsenic is by far the most severe poison for Catalysts. Arsenic maximum allowable content on hydroprocessing catalysts during operation, depending upon the service, is in the range of hundreds of wppm.

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Gradings

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.

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Gradings

Silica Management

Silicon is a well-known widespread poison for hydroprocessing catalysts. The main contributor to silicon is the Delayed Coker. In addition, there is a general tendency in the oil production industry to use more silicon-based flow improvers.

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Gradings

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.

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Adsorbents

Sulfur Removal Adsorbents for Oil, Gas & Petrochemicals

Hydrogen sulfide (H₂S), COS, mercaptans or sulfides are common contaminants that must be removed from various gases and liquids such as natural gas, NGLs, LPGs, cracked gases, olefins or biogas.

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Furnaces

Furnace(s) is a key equipment considering the need for optimal operation of unit. Thanks to an extensive design experience with feedbacks from operators and a complete knowledge of this process, Heurtey Petrochem Solutions provides an unparalleled service such as these following features:

  • High fuel efficiency (94%+) depending on fuel S level
  • Fully Modularized
  • Lowest Emission (95%+ reduction with emission reduction technology)
  • Optimized Plot Plan
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Consulting, Studies & Audits

Axens offers a customized approach, including tailored studies, audits and consulting services, covering technical and operational challenges.

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Unit Revamps & Retrofits

You face many challenges, which include operating in a safe, reliable and environmentally sound manner while responding to changing markets dynamics.

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Customer Training

Designed for all Axens technologies, dedicated to operators & engineers, Axens offers customized training solutions to all our licensees, covering the whole range of Axens technologies.

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Technical Support & Performance Management

Axens is fully committed to be your partner and provide assistance and support during your project lifecycle, from conception to start-up & running operations.

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Digital Services & Applications

Axens' digital platform combines real-time data and digital solutions to optimize operations, reduce environmental impact, and lower costs while maximizing profitability. By delivering actionable insights and detailed performance reports, it enhances asset operation and performance for smarter, more efficient outcomes.

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Reactor Internals

In today’s complex environment, refineries and petrochemical plants around the world need advanced solutions to reach operational excellence. In units featuring fixed-bed reactors, the use of high-efficiency reactor internals are essential to help achieve this goal.

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NARTC 2026
The North American Refining Technology Conference (NARTC) is the World Refining Association’s premier regional event for the refining community. This conference serves as the ultimate platform for industry leaders, innovators, and decision-makers to explore cutting-edge technologies and strategies that will shape the future of refining in a rapidly evolving energy landscape. The event will be held in Houston, Texas on February 10-12, 2026.
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Resources

Technical article

Technical Article - Transforming a refinery unit into a key component of end-of-life plastic circularity

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Technical article

Technical Article - Upgrade Hydrocracked Resid Through Integrated Hydrotreating

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FAQ

Hydrogen consumption is higher than we would like in our raw diesel hydrotreater. Can we lower it without loss of throughput?

Read more
Press release

Pertamina Licenses Axens Technologies for its Balikpapan and Cilacap Refineries in Indonesia

Read more
More resources
Technical article

Technical Article - Transforming a refinery unit into a key component of end-of-life plastic circularity

Read more
Technical article

Technical Article - Upgrade Hydrocracked Resid Through Integrated Hydrotreating

Read more
See all Technical articles
FAQ

Hydrogen consumption is higher than we would like in our raw diesel hydrotreater. Can we lower it without loss of throughput?

Read more
See all FAQ
Press release

Axens’ technologies for Basrah Refinery Upgrading Project

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Press release

Successful operation of Axens’ units and digitalization at the ERC refinery

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Press release

Axens NA Signs Contracts with Meridian Energy Group for Final Process Designs for Davis Refinery

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Press release

Pertamina Licenses Axens Technologies for its Balikpapan and Cilacap Refineries in Indonesia

Read more
See all Press releases

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