C₄ Upgrading by Heterogeneous Oligomerization

Polynaphtha™

In the Polynaphtha™ process, propylene and/or mixed butenes are oligomerized catalytically in a series of fixed bed reactors. Conversion and selectivity are controlled by reactor temperature adjustment while the heat of reaction is removed by feed effluent heat exchange and intermediate reactor cooling. The reactor section effluent is fractionated producing LPG raffinate, gasoline and middle distillate fractions such as kerosene or diesel.

The Polynaphtha™ technology is well suited for revamping existing phosphoric acid polymerization units.

Low investment

Low utilities consumption

22 Selectopol™ and Polynaphtha™ units have been licensed by Axens

Selectopol™

The Selectopol™ process is a variant of the Polynaphtha™ process using the same catalyst but at lower severity:

To convert selectively the isobutene portion of an olefinic C4 fraction to high octane, low RVP gasoline blending stock,
or to enrich Trimethyl Pentene stream for petrochemical applications.

Selectopol™ technology is an alternative scheme to avoid or reduce MTBE production in C4 complex.

Enriched n-butenes raffinate of Selectopol™ is ideally sent to Alkylation, Methyl Ethyl Ketone (MEK), Metathesis or Dimersol-X™ process unit, without any pretreatment.

Low cost means of retrofitting existing MTBE units or debottlenecking existing alkylation units

Almost complete isobutene conversion while preserving N-butenes

20 Selectopol™ and Polynaphtha™ units have been licensed by Axens

Catalysts

Oligomerization Catalysts

Oligomerization technologies achieve high conversions of light olefinic fractions into higher value gasoline and middle distillates in association with dedicated catalysts specially developed for these applications.

Adsorbents

Drying Series Adsorbents

Water removal applications are widely encountered in the industry sector. Activated alumina and molecular sieves stand at the forefront of the several different materials available on the market.

Adsorbents

Purification Series Adsorbents

Material specially developed to achieve your feedstock’s specification requirements.

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.

Consulting, Studies & Audits

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

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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Upcoming Events

16 Sep - 18 Sep

Conference

Marseille, France - CET

3 days

Learn more

Post Combustion Capture Conference PCCC-8

The 8th Post‑Combustion Capture Conference (PCCC‑8) is organized by IEAGHG and will take place September 16–18, 2025 at the World Trade Center in Marseille, France.
This three-day event brings together 200–250 industry, academic, and government experts to discuss the latest advances in post‑combustion CO₂ capture technologies, including pilot plants, demonstrations, and operational CCS projects.