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Cryocap™ Oxy - Cryogenic CO2 Separation for Oxy-combustion

CO2 recovery in power plants

By adapting its Cryocap technology to power plants, Air Liquide Engineering & Construction enables customers to recover very high rates of CO2 and reduce overall atmospheric emission rates to near zero.

Environmentally-friendly process

Designed to capture CO2 in power plants, Cryocap™ Oxy uses oxy-combustion flue gas as its feedstock. The gas initially enters a pre-treatment unit, where it is cooled down and components such as sulfur oxides, hydrofluoric acid, hydrochloric acid and dust are removed, plus most of the nitrogen oxides. Before entering the cryogenic purification unit, the gas is compressed and dried.

Inside the cold box, partial condensation and distillation techniques separate the CO2, removing heavy compounds such as any remaining nitrogen oxides, and light elements such as oxygen, argon, nitrogen, nitrogen oxide and carbon monoxide.

The CO2 product is pressurized to supercritical pressure. Further CO2 is then recovered by recycling non-condensed gases through a membrane system. Finally, residual gas is expanded for energy savings and sent to the stack.


  • Very high CO2 recovery rates
  • Helps power plants achieve near zero atmospheric emissions (NOx, SOx, particle matters, Hg)
  • Residual gas provides energy savings
  • Technology validated by small scale industrial plants (Australia, Spain, France) and by a comprehensive FEED for a large scale industrial plant

Key figures

  • Capacity: 1 000 to 15 000 tons per day

Cryocap Oxy