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Nalco EAME Headquarters

Nalco Europe Sàrl
A-One Business Park
Z.A. La Pièce 1
Route de l’Etraz
1180 Rolle
Switzerland
Tel: +41 (0)21 614 6400




Hydrogen Sulfide Scavengers

Hydrogen sulfide (H2S) occurs naturally in the oil and gas industry. It is also produced by bacterial breakdown of organic materials. Specifically, sulfate reducing bacteria excrete H2S via a dissimilatory process. H2S is a colorless, flammable, and extremely hazardous gas with a characteristic odor similar to "rotten egg". It is an irritant and a chemical asphyxiant. A level of H2S gas > 100ppm is immediately dangerous to life and health.

Nalco's hydrogen sulfide scavengers can provide a cost-effective alternative to conventional gas/liquid sweetening processes such as amine units or solid dry bed processes to prevent hydrogen sulfide corrosion. For gas treating, the choice of an H2S removal process is based on economics. In those system where the level of H2S is <500ppm, the use of scavengers are a good economic choice. If the H2S concentration is >500ppm there are likely more economic choices. It is still technically possible to use a scavenger to remove high concentrations of H2S and this may be the best choice for a short-term need especially if capital cost can be minimized through continuous injection. Nalco Engineers can assist you in identifying and selecting the most cost-effective equipment and chemical for your facility, apply the scavenger treatments, and monitor the results to ensure optimum performance. Scavengers can be applied via pipeline/downhole continuous injection using an atomizer, or applied via a “Bubble Tower” contactor. H2S scavengers can provide successful treatment in a wide range of applications:

  • H2S removal from gas streams
  • H2S removal from sour hydrocarbon liquids (condensate and NGL streams)
  • H2S reduction in sour liquid tank vapor spaces

Benefits to you:

  • Improved environmental, health and safety compliance
  • Maximized throughput while increasing production efficiency
  • Improved water quality by preventing FeS generation, an agent know to cause sheen in discharged produced water
  • Improved injectivity by eliminating FeS from produced water, an agent known to cause plugging
  • Improved operational reliability