CO2 Supply

Technologies for extracting carbon dioxide directly from the atmosphere are known as “Direct Air Capture (DAC).” The process usually consists of three steps: air intake, e.g., via fans, CO₂ absorption (uptake of a gas or liquid into a material) or adsorption (accumulation of substances on the surface material), and separation of the absorbed or adsorbed CO₂ using thermal or electrical energy.

DAC systems differ in terms of the sorption material and the temperature requirements for separating CO₂ from the sorption material.

Absorption and Calcination Process System

The system developed by the Canadian company “Carbon Engineering” uses potassium hydroxide as the absorbent. Separating CO₂ from the sorption material requires high temperatures (850°C).

Adsorption and Desorption Process System

The system developed by the Swiss company “Climeworks” uses an amine-based porous granulate as the adsorbent. During desorption, the adsorbent is regenerated by heating to 70-95°C and applying moderate vacuum pressure. This process, compared to the high-temperature DAC process, can more easily utilize waste heat from other processes, thereby reducing energy demand.