Sanitary Nanofiltration Spiral-Wound Element:
TFC(500 – 700Da)
Synder Filtration’s Nanofiltration membranes are engineered and designed to provide superior separation performance for various application needs. Known for its stable flux and wide range of rejection to monovalent and divalent ions, Synder’s NF membranes have been developed specifically for specialty process applications.
NDX is a newly designed nanofiltration membrane developed for dye desalting and dye concentration applications throughout the textile and dye industry. NDX has the largest molecular weight cut-off of all the nanofiltration membranes offered and has a good rejection of divalent ions with a high passage of monovalent ions. Applications other than dye desalting and dye concentration include demineralization and concentration of lactose, desalination of optical brightening agents, and seawater sulfate removal.
NF SERIES BENEFITS
- Competitive flux as the current industry
standard NF membranes - Excellent MgSO4 and lactose rejection
- Operate at lower pressures than Reverse
Osmosis membranes and still achieve excellent
rejection of divalent and multivalent ions - NF membranes greatly reduce levels of
hardness, nitrates, sulfates, tannins, turbidity, color, TDS, and moderate levels of salt from feed
water streams
COMMON APPLICATIONS
- Demineralization & concentration of lactose
- Desalination of dyes and optical brighteners
- Seawater sulfate removal
Element Specifications
MEMBRANE SPECS
Model | Polymer | Approx. Molecular Weight Cutoff |
Typical Operating Flux |
Min Lactose Rejection1 |
Min MgSO4 Rejection2 | AverageNaCl Rejection3 |
NDX | Proprietary PA TFC | 500-700Da | 44-55 GFD | 80.0% | 90.0% | 30.0% |
1Test Conditions: 2% Lactose solution at 110psi (760kPa) operating pressure, 77°F (25°C)
2Test Conditions: 2,000ppm MgSO4 solution at 110psi (760kPa) operating pressure, 77°F (25°C)
3Test Conditions: 2,000ppm NaClsolution at 110psi (760kPa) operating pressure, 77°F (25°C)
RECOMMENDED OPERATING PARAMETERS
Operating Parameters | |
Maximum Operating Pressure | 600psi (4,137kPa) if T < 95°F (35°C) 435psi (3,000kPa) if T > 95°F (35°C) |
Maximum Temperature | 50°C (122°F) |
pH Range @ Max Temperature | 4-9 |
pH Range @ Ambient Temperature | 4-10 |
Cleaning Parameters | |
Maximum Temperature (Short term <30min) | 40°C (104°F) |
pH Range @ Max Temperature | 3-10 |
pH Range @ Ambient Temperature | 3-10.5 |
Pressure Drop | PSI |
Maximum per Element | 15psi (103kPa) |
Maximum per Housing | 60psi (414kPa) |
Note: Soft start on boost pumps required to rninimize pressure/flow shocks to elements.
Chlorine Tolerance |
500ppm hours, dechlorination recommended |
Element Dimensions & Weight
Element | Model No. | Diameter (B) in(cm) | Length (A) in(cm) | P.W.T. ID/OD in(cm) | Tube Extension (C) in cm) | Dry Weight lb(kg) |
1.8" | 1812F | 1.8(4.6) | 12.0(30.5) | 0.63(1.6) | – | 1.0(0.5) |
2.5" |
2540F 2540M |
2.4(6.1) 2.4(6.1) |
40.0(101.6) 40.0(101.6) |
0.63(1.6) – |
– 1 (2.54) (Both Ends) |
4.0(1.8) 4.0(1.8) |
3.8" |
3838 3838.75 |
3.8(9.7) 3.8(9.7) |
38.0(96.5) 38.0(98.4) |
0.83(2.1) 0.81(2.1) |
– – |
9.0(4.1) 9.0(4.1) |
8" |
8038 8040 |
7.9(20.1) 7.9(20.1) |
38.0(96.5) 40.0(101.6) |
1.13(2.9) 1.13(2.9) |
– – |
29.0(13.2) 29.0(13.2) |
Recommended Element Cross Flow Rate
Element | Feed Spacer (in miles)
|
||||||||||
1.8" | m3/hr gpm |
0.7 3 |
0.7 3 |
0.7 3 |
0.9 4 |
0.9 4 |
|||||
2.5" | m3/hr gpm |
1.4 6 |
1.4 6 |
1.6 7 |
1.6 7 |
1.8 8 |
|||||
3.8" | m3/hr gpm |
6 26 |
7 29 |
8 33 |
8 36 |
9 38 |
|||||
8" | m3/hr gpm |
16 68 |
18 76 |
21 89 |
23 98 |
24 103 |
The recommended cross flow rate will be subject to differential pressure limitations and specific applications.
NF Membrane Area(SQ. FT.)
Element | Feed Spacer (in mils)
|
|||||||||
1812F | 4.5 | 4.0 | 2.9 | N/A | N/A | |||||
2540F | 38 | 30 | 22 | N/A | N/A | |||||
2540M | 36 | 28 | 20 | N/A | N/A | |||||
3838 | 100 | 87 | 68 | 52 | 43 | |||||
3838.75 | 104 | 89 | 69 | 53 | 44 | |||||
8038 | 450 | 400 | 300 | 240 | 200 | |||||
8040 | 450 | 400 | 300 | 240 | 200 | |||||
TECHNICAL NOTES
For element sizes not listed, please call or email Synder Filtration for details. We can design an element to fit your exact needs – just specify the element outer diameter (OD) or vessel/housing inner diameter (ID), element inner diameter (ID), and length. Elements are also available with or without a controlled bypass tail. Additional feed spacers are also available. Trials should be conducted to determine optimal application conditions.
Applications
Similar Membranes
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Resources
MEMBRANE RESOURCES
- Definition of a Membrane
- Membrane Materials: Organic vs. Inorganic
- Pressure-Driven Membrane Filtration Processes
- Concentration Polarization in Pressure-Driven Processes
- Degrees of Membrane Separation
- Flux Behavior in Membrane Processes
Module Configurations & Processes
-> View all membrane resources
TUTORIALS