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For sales gas, the required specification for hydrogen sulfide is 4-5 ppm, while for oil, it is usually higher (i.e., 100 ppm in some cases).

Depending on the size of the production installation, two different strategies to scavenge H2S can be adopted:
• Regenerative systems for large installations
• Non-regenerative systems for small installations
Arkema offers the chemicals used in both types of installations: acid gas absorbers for regenerative units and liquid scavengers for non-regenerative systems (Norust® SC 5x range)
Oxygen scavengers are used in oil production to reduce corrosion resulting from dissolved oxygen. Oxygen scavengers are usually sulfite or bisulfite formulations which will form sulfate (SO4-2) after a reaction with oxygen.
Removal of air by defoaming and mechanical deaeration is an essential step before applying a scavenger to lower the dissolved oxygen content.
Arkema has developed a range of chemical products under the brand name Norust® SC 4X which can selectively scavenge oxygen.

Discover the Benefits and Applications


  • High temperature efficiency                                                                                                                                  
  • Non-scaling in high pH conditions                                                                                                                                
  • No formation of amorphous deposits                                                                                                                                
  • Fluids compatibility with refinery operations                                                                                              
  • Maximize Oil & Gas production capacities and protect production facilities by providing best in class chemicals                                                                                                                                


  • Oil, gas and multiphase streams                                                                                                                                
  • Water injection and completions operations                                                                                                                                 
  • Odour removal                                                                                                                                
  • Hydrotesting and mothballing                                                                                                

More information about this range: H2S & O2 Scavengers

Norust® SC Range

There are two categories of scavengers: oxygen scavengers to remove traces of oxygen dissolved in water and H2S scavengers to remove H2S present in oil, gas and water to comply with the most stringent HSE requirements.

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