vapIndustrial Nanofiltration Membranes:
NDX

Synder’s Nanofiltration membranes are engineered to provide optimal performance in both flux and rejection. With a full-scale R&D laboratory, Synder is capable of fine-tuning ion selectivity and pore size to the specific application requirements of our customers.



NF SERIES BENEFITS

  • NDX is suitable for dye concentration & dye de-salting applications
  • NFS & NFX have excellent MgSO4 and lactose rejection, while NFG is able to partially remove monosaccharides from oligosaccharides
  • NF membranes operate at lower pressures than reverse osmosis membranes and still achieve high rejection of divalent and monovalent ions
  • NF membranes greatly reduce levels of hardness, nitrates, sulfates, tannins, turbidity, TDS, and moderate levels of salt from feed water streams
  • Customization with exceptional speed and unparalleled lead times

Element Specifications

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MEMBRANE SPECS

Model Polymer Approx. Molecular
Weight Cutoff
Typical
Operating Flux
Avg MgSO4
Rejection2
Avg NaCl
Rejection3
Avg Lactose
Rejection1
NDX Proprietary PA TFC 800-1000Da 45-55 GFD 90% 30% 80%

2Test Conditions: 2,000ppm MgSO4 solution at 110psi (760kPa) operating pressure, 77°F (25°C)

3Test Conditions: 2,000ppm NaCl solution at 110psi (760kPa) operating pressure, 77°F (25°C)

1Test Conditions: 2% Lactose solution 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)

 

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" 1812TM 1.8"(4.6) 11.75"(29.8) 0.675"(1.71) 0.75"(1.90) 1.0(0.9)
2.5" 2519HF
2540TM
2540HF
2540HM
2.4"(6.1)
2.4"(6.1)
2.4"(6.1)
2.4"(6.1)
19.0"(48.3)
40.0"(101.6)
40.0"(101.6)
40.0"(101.6)
0.625"(1.59)
0.75"(1.90)
0.625"(1.59)
0.75"(1.90)

1.0" (2.54)

1.0 (2.54)
3.0(1.4)
6.0(2.7)
6.0(2.7)
6.0(2.7)
4" 4040TM
4040HM
4040HF
3.9" (9.9)
3.9" (9.9)
3.9" (9.9)
40.0" (101.6)
40.0" (101.6)
40.0" (101.6)
0.75" (1.90)
0.75" (1.90)
0.625" (1.59)

1.0" (2.54)
12.0(5.5)
12.0(5.5)
12.0(5.5)
8" 8040 7.9" (20.1) 40.0" (101.6) 1.125" (2.86) 35.0(15.9)

 

Recommended Element Cross Flow Rate

Element Feed Spacer (in miles)
24 31 46 65 80
1.8" m3/hr
gpm
0.4
1.8
0.5
2.0
0.6
2.4
0.6
2.5
0.6
2.6
2.5" m3/hr
gpm
1.2
5
1.4
6
1.6
7
1.8
8
2.1
9
4" m3/hr
gpm
2
10
4
18
5
21
5
23
6
24
8" m3/hr
gpm
10
43
11
48
13
55
14
61
15
64

The recommended cross flow rate will be subject to differential pressure limitations and specific applications.


Synder_SpecificMembranes-img1

NF Membrane Area(SQ. FT.)

Element Feed Spacer (in mils)
24 31 46 65 80
1812TM 4 3.4 2.6 2.0 1.6
2540HF 35 30 23 17 15
2540HM 33 28 21 16 14
4040HF 99 87 68 51 43
4040HM 96 82 64 50 42
8040HF 440 380 293 227 193

 

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.