NDX – Industrial

Industrial 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.

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

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

MEMBRANE SPECS

Model	Polymer	Approx. Molecular Weight Cutoff	Typical Operating Flux	Avg MgSO₄ Rejection²	Avg NaCl Rejection³	Avg Lactose Rejection¹
NDX	Proprietary PA TFC	500-700Da	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)

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

m³/hr
gpm

2
10

4
18

5
21

5
23

6
24

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)

1812TM

3.4

2.6

2.0

1.6

2540HF

2540HM

4040HF

4040HM

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.