Requirements in relation to purity are increasing in the modern beverage industry. Adding a CO₂ Purification Unit (PUR-A/D) to the recovery system secures an efficient stripping of oxygen and inert gases.

The CO₂ liquefaction process in the traditional recovery plant involves the separation of non-condensable gases where oxygen, being the most critical component, is reduced to below 30 ppm. As oxygen causes deteriorative reactions in beer and affects the shelf-life of packaged beer the modern brew industry requires oxygen content less than 5 ppm

The CO₂ Purification Unit (PUR-A/D) can be supplied as an integrated part of the recovery plant or as a separate unit to be added on any existing installation.

It is available in two standards according to the actual raw gas purity and the requested purity of the final CO₂ product.