Patended 3-stage membrane-based separation process

Evonik has developed and patented a 3-stage biogas upgrading process that makes optimum use of the SEPURAN® Green membranes separation properties.

In the gas separation process, which has been developed by Evonik, binary gas mixtures such as raw biogas, which consists primarily of biomethane and carbon dioxide, can be separated very efficiently and cost effectively. In addition to increased yields and lower equipment and energy requirements – a second compressor is no longer required - the membrane process eliminates the need for additional purification, so that the enriched gas can be fed directly into the natural gas network.

Patents granted in relevant markets

The 3-step membrane process developed by Evonik is legally protected in all major European markets besides America and Asia.

At the core of the separation process are the innovative hollow fibre membranes of Evonik’s SEPURAN® Green brand. These consist of a high-performance plastic, developed by Evonik, which can withstand extreme pressure and temperatures. The membranes also have excellent selectivity. In combination with the three-stage separation process, recycling streams can be minimized which helps to optimize the energy costs of biogas processing plants.

License to use

With the purchase of the SEPURAN® Green membranes, Evonik’s contract partners – plant engineering companies - also receive a license to use this three-stage separation process. In turn, when a company buys a biogas processing plant with SEPURAN® Green membranes that has been constructed by Evonik’s contract partners, the plant can be operated using the patent-protected process.