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DISPERSE: Membrane antiscalants

Norlex’ Disperse series of antiscalants include products to control any challenges that cause fouling.

DISPERSE antiscalant series are water based, NSF approved (NSF-ANSI Standard 60) products for preventing different types of scales and fouling in nanofiltration (NF), reverse osmosis (RO) and recirculated/reversible electro dialysis (RED) equipment.

Membrane antiscalants that effectively controls scales.

Without some means of scale inhibition membrane elements will scale and plug due to precipitation of salts, such as calcium carbonate, calcium sulfate, barium sulfate and strontium sulfate. Membrane systems operates with high recovery ratios, so the concentrate water oftem exceeds the solubility limits of gypsum and calcite, which leads to crystallization on membrane surfaces. The build-up of scale results in permeate flux decline, which leads to a need for cleaning the membranes.

There are three methods to control scale:

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Acidification – where you add acid to reduce pH

 

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Ion exchange softening

 

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Antiscalant addition

 

Antiscalants are often the best method, giving better economy and excellent control. Antiscalants are surface active materials that interfere with precipitation reactions in three primary ways:

  1. Threshold inhibition:
    Increases the solubility limit of soluble salts.
  2. Crystal modification:
    Distorts crystal shapes so scale crystals appear more oval in shape, and less compact. The result is a soft scale that is less likely to foul the membrane.
  3. Dispersion:
    Adsorbtion of product on scale crystals and colloidal particles to create a high anionic charge, which keep the crystals separated. The high anionic charge also repels the particles from the membrane surface that has a fixed anionic charge present.

Adsorbtion of product on scale crystals and colloidal particles to create a high anionic charge, which keep the crystals separated. The high anionic charge also repels the particles from the membrane surface that has a fixed anionic charge present.

Our DISPERSE series are produced using NSF certified raw materials (NSF-ANSI Standard 60).

Antiscalant selection

Norlex Chemicals base the product selection on our NORSCALE method.

NORSCALE is a software application that calculates the probability of different low solubility compounds fouling the membranes or other technologies.

The software utilises a conversion process for the concentration of salts. Based on the calculations performed by the program, the optimal treatment product, the required dosing and the optimal recovery rate for the system is given.

Products

DISPERSE 290: Product based on polyacrylic and organophosphonic derivatives.

Works by inhibition and dispersion of low solubility salts in the water source. Recommended for water containing sulfates.

 

DISPERSE 733: Product based on acrylic and organophosphonic derivatives.

Works by inhibition and dispersion of low solubility salts in the water source.

 

DISPERSE 735: Product based on organophosphonic derivatives (sodium salt).

Works by inhibition and dispersion of low solubility salts in the water source.

 

DISPERSE 739: Product based on organophosphonic derivatives in acidic form.

Works by inhibition and dispersion of low solubility salts in the water source.

 

DISPERSE 741: Product based on acrylic and organophosphonic derivatives.

Works by inhibition and dispersion of low solubility salts in the water source.

 

DISPERSE 751: Product based on organophosphonic derivatives.

Works by inhibition and dispersion of low solubility salts in the water source.

 

DISPERSE 752: Product based on polyacrylic and organophosphonic derivatives.

Works by inhibition and dispersion of low solubility salts in the water source.

 

DISPERSE 753: Product based on organophosphonic derivatives in acidic form.

Works by inhibition and dispersion of low solubility salts in the water source.

 

DISPERSE 755: Product based on organophosphonic derivatives (sodium salt).

Works by inhibition and dispersion of low solubility salts in the water source.

 

DISPERSE 782: Product based on polyacrylic and organophosphonic derivatives.

Works by inhibition and dispersion of low solubility salts in the water source.

 

DISPERSE 786: Product based on organophosphonic derivatives (sodium salt).

Works by inhibition and dispersion of low solubility salts in the water source.

 

DISPERSE 840: Product based on organophosphonic derivatives (sodium salt).

Works by inhibition and dispersion of low solubility salts in the water source.

CONTACT US FOR ANY ENQUIRIES OR IF YOU NEED A CONSULTANT

An agreement with Norlex amounts to much more than the supply of quality products. We provide service throughout the process in the form of support, knowledge and troubleshooting, so the customer gets a cost-effective solution. Call +45 4594 0994 or send an email to info@norlex.com.