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: [email protected] or T: 253.437.0844.

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

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*UPDATE: DuraMem® is no longer available at Sterlitech. For those who purchased the said membranes, below is the spec table for your reference. 

Model Duramem 200 Duramem 300 Duramem 500 Duramem 900
Polymer P84® polyimide P84® polyimide P84® polyimide P84® polyimide
Pore Size 200 Da 300 Da 500 Da 900 Da
pH 7 7 7 7
Max Temperature 50° C (122 F) 50° C (122 F) 50° C (122 F) 50° C (122 F)
Max Pressure 20 - 60 bar (290 - 870 psi) 20 - 60 bar (290 - 870 psi) 20 - 60 bar (290 - 870 psi) 20 - 60 bar (290 - 870 psi)

If you're looking for an alternative, click here.