vapSanitary Nanofiltration Spiral-Wound Element:
NDX (800Da – 1kDa)

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.



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

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MEMBRANE SPECS

Model Polymer Approx. Molecular
Weight Cutoff
Typical
Operating Flux
Min Lactose
Rejection1
Min MgSO4 Rejection2 AverageNaCl Rejection3
NDX Proprietary PA TFC 800-1,000Da 44-55 GFD 80.0% 90.0% 30.0%

1Test Conditions: 2,000ppm 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)
24 31 46 65 80
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.


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NF Membrane Area(SQ. FT.)

Element Feed Spacer (in mils)
24 31 46 65 80
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.