CO₂ polishing cleans upgraded biogas or natural gas for CO₂, which makes it possible to liquify the gas. Without CO₂ polishing, the CO₂ in the gas would freeze and crystallise, which causes problems for the liquefaction process.
To overcome these problems, Ammongas’ polishing process, which resembles a biogas upgrading plant, removes the CO₂ from the gas. The amine solution absorbs the CO₂ present in the gas and leaves behind a pure gas, and thus the polisher plant can remove down to <50 ppm of CO₂. At this CO₂ level, the gas can be liquified without complications and is ready to be used as a fuel source or for transport.
