Amine scrubbing is a chemical process that is suitable for sites with a source of heat and high product gas requirements, and where the gas has to be delivered from the gas upgrading unit to the feed-in station at low pressure. It is also no problem to increase the pressure for sites outside Germany where higher pressure is required.

After pretreatment, the raw gas flows through a packed column, where an amine solution that absorbs carbon dioxide is trickling from top to bottom in the opposite direction to the gas. Then, biomethane of up to 99.9% purity is removed at the top of the tower. The used amine scrubbing solution is regenerated for reuse in the process.

This process is highly robust when it comes to dealing with impurities in the stream of biogas, and like membrane technology stands out in terms of high plant availability.

Model S
Upgrading capacity 500/700/1,000 Nm3/h

Model M
Upgrading capacity 1,400/2,000/2,500 Nm3/h

Model L
Upgrading capacity ≤ 5,600 Nm3/h