S Oil Ulsan Refinery Residue Upgrading Project

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Summary Information

  • Ownership: S Oil (Saudi Aramco and Hanjin Group)
  • Website: http://www.s-oil.com/
  • Wiki Page: S-Oil Ulsan Refinery
  • Location: Ulsan, South Korea
  • Capacity: 33,5 million tons/annum & 669,000 bbl/day
  • Nelson Complexity:
  • Project Stage: Completed 2019
  • Budget: USD 4.2 billion

The Project

  • Project Type: Upgrade of existing refinery
  • Project Summary: The upgrade of the refinery includes the addition of a residue hydrodesulfurization unit, a residue fluid catalytic cracker and multiple downstream upgrading units to enable the refinery to produce more higher value products and, in particular, maximize production of polymer-grade propylene.
  • Main Contractors
    • Foster Wheeler: Front-end engineering design (FEED)
  • Licences:
    • Axens: Atmospheric residue desulfurization unit (Hyvahl™), High Severity FCC unit (HS-FCC™), LPG extractive sweetening unit (Sulfrex™), Gasoline desulfurization unit (Prime-G+™), A C4-stream processing section including a C4 selective hydrogenation unit, a MTBE unit, a super-fractionator and a butane isomerization unit.

Refining Units

  • Residue Hydrodesulfurization Unit
  • Residue fluid catalytic cracker
  • Gasoline desulphurisation
  • LPG desulphurisation
  • Isomerization

Terminal Capacity

  • Crude Oil:
  • Refined Products:

Crude Supply

  • There is no change to the crude supply

Products Produced

  • Gasoline, , LPG, Polymer-grade propylene


  • 2014 - Foster Wheeler wins FEED for Upgrade Project
  • 2015 - Axens chosen for process units technologies
  • 2019 - The project is completed

Other Information



  1. Foster Wheeler Awarded FEED Contracts By S-OIL Corporation For Residue Upgrading Project In South Korea
  2. Axens to supply technologies for S-OIL’s residue upgrading capacity expansion project
  3. S-OIL ushers in a new era from “oil to chemical