Membrane separation is one of the classical methods for gas upgrading. The membrane process is based on using permeable membranes to separate methane and CO2. The first generation membranes required higher pressures (40 bar) and the efficiency was low. With the present state of the art membranes, the required pressure is much lower (typical 8-17 barg) and an efficiency of 99,5% can be reached with a 3-stage system

Membrane separation has proven to be a simple, energy efficient and environmentally friendly method for biogas upgrading.

The following features characterize the membrane process:

•             Compact and easy to operate

•             Low production and maintenance costs.

•             Low methane losses (< 0,5%)

•             No use of water or chemicals

•             Dry process, no additional drying of biomethane required.

•             Partial removal of oxygen

•             Completely prefabricated containerized solutions ready for
installation and operation