BORSIG Membrane Technology GmbH
Bottroper Str. 279
D-45964 Gladbeck / Germany
Phone +49 (0) 2043 / 4006-01
Fax +49 (0) 2043 / 4006-6299



The separation technology and process solutions provided by BORSIG Membrane Technology are based on the principle of gas permeation. When applying a pressure gradient across a selective membrane a feed gas mixture is separated by the membrane into two output streams of different composition - the high pressure residual stream: the retentate and the part of the feed gas stream which is transported across the membrane: the permeate. The required pressure difference can be created utilising the pressure level already inherent in the process or by compressing the feed gas and/or by application of vacuum to the permeate side of the membrane, if an operation at elevated pressures is not possible or desired. The preferentially permeating components are concentrated in the permeate flow on the low pressure side of the membrane. The gas mixture remaining on high pressure is enriched with the components with low transportation rates across the membrane.

The applicability of a membrane for a specific separation is achieved by means of the membrane material's special properties. With a hydrocarbon selective membrane for instance in such a process the more easily liquefied components like propane, butane, pentane or in general higher hydrocarbons (C3+) and organic solvents are separated preferentially and are concentrated on the low pressure side of the membrane. On the other hand the lighter, permanent and non condensable gases, such as methane or nitrogen, remain at high pressure with only a minimal pressure drop while being processed.

principle of gas permeation