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Sigma - Standard Air Separation Unit

Oxygen plants
Standard plants
Standard Plants

PDF - 1.04 MB

Sigma standard air separation units draw on Air Liquide’s many years of experience in oxygen production. Sigma units are based on the latest separation technology, using air compression, adsorption, purification, cryogenic distillation of main components, and internal compression. They produce oxygen up to 99.6% purity, as well as gaseous nitrogen and liquid oxygen, nitrogen and argon to refill backup liquid tanks.

Sigma units have a highly packaged architecture which allows for reduced construction costs and rapid time to production. They can be configured to optimize capital expenditure (CAPEX) or operational expenditure (OPEX), depending on customer requirements.

Sigma units are typically used in the production of steel (oxygen boosting, electric arc furnace), chemicals (ethylene oxide, etc.), glass, non-ferrous metals, pulp and paper, as well as the treatment of wastewater.

Advantages of sigma units

  • Reduce construction and time to production
  • Liquid co-production also available
  • CAPEX / OPEX optimization

Key figures

  • Capacity: 110 to 350 tons per day
  • Specific energy: 280 to 460 Kilowatt hours per ton (kWh/t)