Organic solvent nanofiltration

Superior Membrane Performance

The PURAMEM® membranes are market leading for Organic Solvent Nanofiltration (OSN). THey are made from the P84® polyimide. Their superior stability in non-aqueous solvents allows users to generate extra product value in a wide variety of applications in chemical process industries. Benefits of OSN include reduced cost of goods, reduced energy consumption, and increased yield through gentle, ambient temperature separations.

Evonik provides OSN membrane products with performance characteristics targeting the needs of the chemical process industries for separation-, purification-, recovery- or concentrationbased applications.


PURAMEM® is a membrane series stable in apolar hydrocarbon-type solvents. PURAMEM® shows superior rejection and flux performance as compared to similar commercially available membranes. The PURAMEM® membrane family is also solvent-stable, but is compatible and designed for use with nonpolar solvents such as aromatic hydrocarbons, aliphatic hydrocarbons and ethyl acetate.




flat sheets and spiral wound membrane modules

Molecular weight cutoff range

280 to 600 Da

Recommended maximum temperature


Recommended maximum operating pressure

from 20 to 60 bar (290 to 870 psi)

Useable in

toluene, heptane, hexane, methylethylketone , methyl-isobutylketone, ethyl acetate, and more

Not recommended in the presence of

most polar and polar aprotic solvents, chlorinated solvents, strong amines


• PM Selective
• PM Performance
• PM Flux

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