Cryocap™ FG: capturing CO₂ from industrial fumes

Published on July 03, 2025

2 minutes

The energy transition confronts heavy industry with a major challenge: drastically reducing CO₂ emissions in processes where they seem unavoidable. To support this evolution, Air Liquide is deploying Cryocap™ FG1, a technology specially designed to transform industrial fumes into recoverable liquid CO₂. An innovative solution that opens up new prospects for the decarbonization of high-emitting sectors such as cement, lime or glass production.

Cryocap™ FG completes the range of CO₂ capture technologies developed by Air Liquide, alongside Cryocap™ OXY and Cryocap™ H₂. Specifically designed for hard-to-abate industries, this solution meets the challenge of reducing CO₂ emissions that are particularly difficult to avoid. How does it work? Learn more in this video:

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The Cryocap™ FG process breaks down into seven key steps, enabling CO₂ emissions to be transformed from a gas into a liquid that is easy to transport and store:

  1. Cleaning and filtration: industrial fumes are first cleaned to remove impurities that could disrupt the process
  2. Compression: the gas is then compressed, the first essential condition for CO₂ to become liquid
  3. Drying: residual moisture is removed from the gas
  4. Concentration of CO₂: the process separates CO₂ from other gaseous components (mainly oxygen and nitrogen). The decarbonized and cleaned smoke is evacuated
  5. Further compression: the isolated CO₂ is further compressed
  6. Cooling: the gas is cooled to very low temperatures, the second condition to obtain CO₂ in liquid form
  7. Transport: once liquefied, CO₂ can be easily transported to geological storage sites, such as depleted natural gas fields

This Air Liquide proprietary technology will be deployed for the first time in northern France, where the Group has signed a partnership with Lhoist to decarbonize its Réty lime production plant. Objective: capture and purify 95% of the CO₂ from the existing lime production unit.

This technology is thus perfectly in line with Air Liquide's global decarbonization strategy, which offers solutions tailored to different types of industries and their specific needs.

1. FG: Fluid Gas

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