Sulfur removal (desulfurization)

Treatment of sulfurous off-gases is one of the critical environmental challenges for oil and gas industry. Sour gas emissions are regulated, and breaching the standards for concentrations and volumes of emissions can result not only in administrative order issuance and emissions penalty, but also affect the export capacity of the enterprise.

Hydrogen sulfide (H2S):

  • Toxic agent (MAC 10 mg/m3)
  • Corrosive to metal equipment
  • Unpleasant odor causes deterioration of the environmental quality near enterprises

Hydrogen sulfide is formed at refineries and gas treatment plants in the processes of hydrogenolysis of organosulfur compounds in the processes of hydrotreating oil fractions of various origins and hydrocracking. The Claus process is the main method for removing hydrogen sulfide from gas emissions. State-of-the-art catalytic technologies used for this process provide a guaranteed sulfur recovery efficiency of 96%.

To ensure minimum sulfur recovery efficiency of 98%, the Claus plant is equipped with a tail gas clean-up system using selective oxidation of hydrogen sulfide into elemental sulfur.

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