Gas separation

Efficient on-site nitrogen generation with SEPURAN® N2 membranes made by Evonik

Evonik's SEPURAN® N2 membrane has been especially developed for nitrogen generation combining low air consumption at all temperature levels with high nitrogen capacity.

Nitrogen calculator by SEPURAN®

Use Evonik's SEPURAN® N2 calculator to learn how much nitrogen you can make. Estimate the number and type of membranes you need by inputting the nitrogen flow, temperature, nitrogen purity and pressure. If you need more information, please call or email your local contact. 

Nitrogen generation membranes with purity up to 99.5%

Efficient air separation and nitrogen generation with SEPURAN® N2 is especially suitable when spaces are being blanketed to achieve an inert atmosphere. The reduction of atmospheric oxygen results in many different applications.

SEPURAN® N2 modules from Evonik have high selectivity and permeability. They combine low air consumption with high nitrogen capacity. The benefits for you: you need a small compressor, only a few modules, and operational costs are low.

SEPURAN® N2 is especially suitable in a wide variety of blanketing or inerting. As opposed to other membrane modules that are available on the market, the Evonik module combines excellent capacity with low air consumption. Alternatively, our SEPURAN® N2 Selective module can be used for low throughput volumes. The Selective version achieves high purity with extremely low air consumption. Energy consumption is especially low, while the capacity remains competitive.

How does nitrogen generation with Evonik's SEPURAN® N2 membranes work?

Gas separation membranes work on the principle of selective permeation through a membrane surface. The driving force for permeation of the gas through the membrane is the difference between the partial pressures of the gas on the retentate side (the interior of the hollow fibre) and the permeate side (the exterior of the hollow fibre). 

Efficient and economic onsite nitrogen generation

With polymer produced at Evonik, we have given our SEPURAN® N2 nitrogen generation membranes a high selectivity and permeability. This results in numerous advantages for you and your customer. With a pressure rating up to 50% higher, you can minimize your membrane space using SEPURAN® N2. The pressure variety of up to 16 barg to 25 barg or even 40 barg offers you a larger freedom to choose the parameters to minimize your invest cost.

  • Enormous cost savings compared to conventional gas cylinders
  • Low installation and running costs
  • Low maintenance
  • High capacity combined with low air consumption
  • Purity of up to 99.5% N2
  • Pressure up to 16 barg
  • Flexible in terms of adjusting purity
  • Easy to operate and install
  • No safety risks associated with handling gas cylinders

Application overview

In terms of efficiency and energy, membranes are unbeatable. In this case, nitrogen can be obtained directly from the air that surrounds us all. But in the process, the gas must be separated from oxygen, which makes up about 21 percent of this air. In membrane systems, compressed air is passed through long, thin hollow fiber membranes. This creates a partial pressure difference between the outside and the inside of the hollow fiber. The smaller oxygen molecules slip through the membrane, while the nitrogen molecules remain inside. The effect is that the less air is added, the purer the nitrogen in the end.