DURAMEM® and PURAMEM® for Organic Solvent Nanofiltration

DuraMem® and PuraMem® membranes are now available as a valuable addition to our Chemically Resistant Membranes product line. Duramem® and Puramem® polymeric membranes, made by Evonik, are market leaders for Organic Solvent Nanofiltration (OSN).


Organic Solvent Nanofiltration, i.e. separation of molecules dissolved in organic solvents through a semipermeable membrane, has gained great traction over the last decade. Advantages of OSN over conventional separation processes include lower energy requirements, conservation of expensive materials, and system robustness.


DuraMem® offers long term stability in most polar and polar aprotic solvents (acetone, tetrahydrofuran, dimethylformamide, isopropanol, acetonitrile, methylethylketone, ethyl acetate, and more), while PuraMem® series is stable in apolar hydrocarbon-type solvents (toluene, heptane, hexane, methylethylketone, methyl-isobutylketone, ethyl acetate, and more).


Technical Specs



  • Material: P84® polyimide

  • Molecular weight cutoff range:


    • Duramem®: 150 to 900 Da

    • PuraMem®: 280 to 600 Da


  • Recommended maximum temperature: 50°C (122°F)

  • Recommended maximum operating pressure: from 20 to 60 bar (290 to 870 psi)


Main Application Areas for DuraMem® and PuraMem® Membranes1



  • Removal of impurities or product purification

  • Monomer/dimer separation

  • Molecular fractionation

  • Room temperature solvent exchange

  • Catalyst recovery and recycle

  • Color removal

  • Solvent recycling


Both DuraMem® and PuraMem® series are available in a flat sheet format as well as spiral wound elements. For more information about these membranes and their applications, contact a Membrane Process Specialist at Sterlitech: E: sales@sterlitech.com or T: 253.437.0844.


1 Source: Evonik Corporation: http://duramem.evonik.com/product/duramem-puramem/en/Pages/osn-membranes.aspx