What are Nanofiltration Membranes?


Intro

Synder Filtration offers a suite of nanofiltration (NF) membranes that are engineered to provide optimal flux and rejection and can be customized to meet the unique requirements of specific process applications. Available in both spiral-wound and flat sheet membrane configurations, Synder’s nanofiltration membranes are capable of rejecting multivalent salts and larger molecules, while selectively rejecting varying amounts of monovalent salts.

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Overview

Nanofiltration is a separation process characterized by organic, thin-film composite membranes with a pore size range of 0.1 to 10nm. Unlike reverse osmosis (RO) membranes, which reject all solutes, NF membranes can operate at lower pressures and offer selective solute rejection based on both size and charge.

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Degrees of Separation

Synder Filtration’s wide range of nanofiltration membranes offer varying degrees of ion selectivity to aid in the development of customized process solutions. Synder’s sanitary NF membranes are compliant with FDA standards listed in CFR Title 21, 3-A Sanitary Standards No. 45-02, as well as USDA sanitary standards and are fit for use in a variety of sanitary, as well as industrial applications across a broad spectrum of industries. If required, Synder can even develop new custom nanofiltration membranes to meet specific process goals, in partnership with our customers. More information about our custom membrane development program can be found here.




NF Products

With a pore size between 0.1-10nm, Synder Filtration’s nanofiltration membranes allow water and some salts to pass through the membrane while retaining multivalent ions, low molecular weight molecules, sugars, proteins, and other organic compounds. After years of research and development, Synder’s NFS, NFX, NFW, and NFG nanofiltration membrane products have been proven to offer great resistance to fouling, a high degree of selectivity, and the physical durability needed for application in a wide range of industrial separation processes. NFS, NFX, and NFW have excellent MgSO4 and lactose rejection, while NFG partially removes monosaccharides from oligosaccharides. Nanofiltration membranes overall are also able to greatly reduce levels of hardness, nitrates, sulfates, tannins, turbidity, color, TDS, and moderate levels of salt from feed water streams.

Model Polymer Approx. Molecular
Weight Cutoff
Typical Operating Flux Avg Lactose Rejection1 Avg MgSO4 Rejection2 Avg NaCI
Rejection3
NFS Proprietary PA TFC 100-250Da 30-40 GFD 99.5% 99.5% 50.0%
NFX Proprietary PA TFC 150-300Da 20-25 GFD 99.0% 99.0% 40.0%
NFW Proprietary PA TFC 300-500Da 45-50 GFD 98.5% 97.0% 20.0%
NDX Proprietary PA TFC 500-700Da 35-45 GFD 90.0% 95.0% 40.0%
NFG Proprietary PA TFC 600-800Da 55-60 GFD 60.0% 50.0% 10.0%

1Test Conditions: 2% Lactose solution at 110PSI (760 kPa) operating pressure, 77° F (25° C)
2Test Conditions 2,000ppm MgSO4 Solution at 110PSI (760 kPa) operating pressure, 77° F (25° C)
3Test Conditions 2,000ppm NaCI Solution at 110PSI (760 kPa) operating pressure, 77° F (25° C)


NF Applications

Nanofiltration membranes are a relatively recent development, and offer greater selectivity of ions vs. reverse osmosis membranes that reject all ion species in a feed stream. This unique characteristic provides flexibility in separation process development that can greatly impact performance and profitability, especially for industrial applications.Here are some common applications of Synder’s NF membrane technology:

 

MF - Dairy

Dairy

  • Lactose and whey demineralization in dairy processing
  • Lactose and whey concentration

 

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Industrial/Wastewater Treatment

  • Removal of natural organic matter in water and wastewater treatment
  • Reduction of hardness in water purification
  • Sulfate removal from seawater and chemical processes
  • Desalting of process streams in various industries

 

Synder offers a comprehensive application development program and custom nanofiltration membrane development may be available upon request. Please contact us for more information. You will receive a personal response from one of our experienced team members within 24 hours.

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Resources

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