Technical Information

PuraMem® Products
PURAMEM® 280, PURAMEM® S600,PURAMEM® SELECTIVE, PURAMEM®
PERFORMANCE AND PURAMEM® FLUXPuraMem® membranes are designed to be used inOrganic Solvent Nanofiltration (OSN) applications.
They perform best in apolar solvents - for example
aliphatic and aromatic hydrocarbons – and arecurrently available with a cutoff of 280Da and600Da. PuraMem® products are usually used in flat
sheet form for lab scale membrane screening tests
and in spiral wound format for pilot and commercialprocesses.

Main applications

Main benefits

Removal of polymeric
impurities

Increased product value

Product purification

Reduced operating cost

Monomer/dimer separation

Reduced processing time

Molecular fractionation

Environmentally friendly

Room temperature solvent
exchange
Catalyst recovery andrecycle
Decoloration
Solvent recycling

Evonik Operations GmbH | PuraMem® | July 2020 1/4

SPECIFICATIONS PURAMEM® 280 AND
PURAMEM® S600®
General Membrane Material: Polyimide (PuraMem® 280)
and Silicone-coated polyimide (PuraMem® S600)
 Flat Sheet: 210 x 297 mm
 Spiral-Wound Modules:
Type1812

2512

2520

2540

4020

4040

Nominal Size (Dia x L)

1.8”×12”2.5”×12”2.5”x20”2.5”×40”4.0”×20”4.0”×40”8.0”×40”

Membrane Area (m2)1

0.11

0.17

0.60

1.8

2.0

5.424.0

Typical Feed Flow (L.h-1)

150500

500

500

1500

15007500

Standard Feed Spacer (all)1

8040*

30 mil (0.76 mm)* Female module type.

SOLVENT STABILITY PuraMem® membranes are stable in mild and nonpolar solvents2:- e.g. Alcohols (e.g. Methanol, Ethanol, 2Propanol)- Aliphatic hydrocarbons (e.g. Hexane,Heptane)- Aromatic hydrocarbons (e.g. Toluene,Xylene)- Butyl Acetate, Ethyl Acetate- Methyl-Ethyl-Ketone- Methyl-tert-Butyl-Ether PuraMem® membranes are not recommended foruse in aqueous/water mixtures. For
aqueous/organic solvent mixtures, please contact
us for membrane recommendations.

USE CONDITIONSMembrane CodePuraMem®

PuraMem® S

MWCO (g.mol-1)3,4280

600

Minimum Flux (L.m-2.h-1)31830

Typical Operating Pressure(bar)

20-40

20-40

Maximum Pressure (bar)60

60

Maximum Temperature (ºC)

5050

Allowable pH

771 Membrane area is a nominal value and depends on the spacer dimensions

used in the module.

2 Data referring to membrane sheets with pure solvents. If you intend to use asolvent not listed above please contact us for further advice.

3 Performance Data are approximate and based on flat-sheet membrane. Test

conditions: toluene at 30 bar and 30ºC.

4 Based on rejection of styrene oligomers dissolved in toluene. MWCO =molecular weight cut-off which is defined as the molecular weight at which
90% rejection is obtained from a curve of rejection versus molecular weight ofstyrene oligomers dissolved in toluene.

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SPECIFICATIONSPURAMEM® SELECTIVE, PURAMEM®
PERFORMANCE, PURAMEM® FLUXGeneralMembrane Material: Silicone-coated PANFlat Sheet: 210 x 297 mm
Spiral-Wound Modules:
Type

1812

2512

2520

2540

4020

4040

Nominal Size (Dia x L)

1.8”×12”2.5”×12”2.5”x20”2.5”×40”4.0”×20”4.0”×40”8.0”×40”

Membrane Area (m2)1

0.18

0.27

1.1

2.2

2.5

6.7

32.0

Typical Feed Flow (L.h-1)

300

800

800

800

2800

2800

12500

Standard Feed Spacer (all)8040*30 mil (0.76 mm)* Female module type.

SOLVENT STABILITYPERFORMANCE PuraMem® membranes are stable in mild and nonpolar solvents2:- e.g. Alcohols (e.g. Methanol, Ethanol, 2Propanol)- Aliphatic hydrocarbons (e.g. Hexane,Heptane)- Aromatic hydrocarbons (e.g. Toluene,Xylene)- Butyl Acetate, Ethyl Acetate- Methyl-Ethyl-Ketone- Methyl-tert-Butyl-Ether PuraMem® membranes are not recommended foruse in aqueous/water mixtures. For
aqueous/organic solvent mixtures, please contact
us for membrane recommendations.

PuraMem® Selective, Performance and Flux arecomposite membranes. Molecules solubility (and notdiffusion!) dominates the membrane separation.
Therefore, the cut-off of the membrane is strongly
dependent on the solvent-solute combination.
MWCO obtained in one standard system is notcharacteristic for this type of membrane. Bestsuitable membrane for the application can be chosen
by testing in real solution.

USE CONDITIONS
Typical Operating Pressure (bar)20-40

Maximum Pressure (bar)60

Maximum Temperature (ºC)

50

Allowable pH

7Evonik Operations GmbH | PuraMem® | July 2020 3/4

TolueneHeptane

MethylethylketonEthanol

PuraMem®
Selective3015204PuraMem®
Performance

506080

10PuraMem®
Flux708010015Solvent

1 Membrane area is a nominal value and depends on the spacer dimensions
used in the module.
2 Data referring to membrane sheets with pure solvents. If you intend to use asolvent not listed above please contact us for further advice.
3 Minimal permeate flux, data are approximate and based on flat-sheet
membrane. Test conditions: 30 bar and 30ºC.2

DIMENSIONSPuraMem® Membrane Module

Disclaimer
This information and all technical and other advice are based onEvonik’s present knowledge and experience. However, Evonikassumes no liability for such information or advice, including theextent to which such information or advice may relate to third party
intellectual property rights. Evonik reserves the right to make anychanges to information or advice at any time, without prior orsubsequent notice. Evonik disclaims all representations andwarranties, whether express or implied, and shall have no liability
for, merchantability of the product or its fitness for a particularpurpose (even if Evonik is aware of such purpose), or otherwise.
Evonik shall not be responsible for consequential, indirect orincidental damages (including loss of profits) of any kind. It is thecustomer’s sole responsibility to arrange for inspection and testingof all products by qualified experts. Reference to trade names usedby other companies is neither a recommendation, nor anendorsement of the corresponding product, and does not imply
that similar products could not be used.

Evonik Operations GmbHHigh Performance Polymers
Paul-Baumann-Straße 145772 MarlGermany
Phone +49 02365 49-4800
emet@evonik.com
www.evonik.com/puramem

ModuleA(mm)B(mm)

C(mm)

D(mm)

E(mm)

1812

305

200

52

19.05

53-55

2512

305

200

63

19.05

64-66

2540

1016

910

63

19.05

64-66

4020

508

410

100

19.05

101-103

4040

1016

920

100

19.05

101-103

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