ION-EXCHANGE RESINS : QUALITY BASED SOLUTION FOR DECONTAMINATION

Ion exchange resins remove dissolved ionic contaminants from liquids. Therefore, functional groups are attached to the polymer beads. Water treatment is one of the major fields of application for ion exchange resins. It is particularly utilized as a water softening agent. It ensures that the calcium ions responsible for water hardness are replaced by sodium ions. It is used in large scale industry such as power generation as well as in the production of ultra-pure boiler feed water and steam to avoid incrustations and corrosion. This improves the efficiency, lifetime of power plants and operation credibility.

Resulting removal of toxic substances due to the utilization of ion-exchange resins,  plays a vital role in cleaning of industrial effluent and treatment of groundwater. Alongside, it is also used in other fields of application such as semiconductor production, galvanic industry (recovery and treatment of metals such as gold, copper, nickel or cobalt in hydrometallurgy), pharmaceuticals, and the food and beverage industry.

In the production of crystal sugar and liquid sugar syrup, it enhances the brown cane sugar to be turned into the attractive white product and ensures that sugar also tastes like sugar. Ion exchange resins are also reliable catalysts which are crucial for many chemical reactions.

As per individual industrial requirements and uses, ion-exchange resins are categorized as follows:

Cation Softener Resin

It is an optimum quality strong acid cation exchange resin, comprising nuclear sulfonic acid groups having high exchange capacity. It is combined with excellent physical and chemical stability as well as operating specifications. It can be utilized in a broad range of pH and temperature. It is supplied in hydrogen form for demineralization applications as cation resins and sodium form for softener applications. Alongside, it is also utilized in dealkalization and chemical processing.

Type Strong acid cation exchange resin
Appearance Amber colored beads
Functional group Nuclear Sulfonic
Physical form Moist spherical beads
Ionic form Hydrogen / Sodium
Particle size 0.3 to 1.2 mm
pH range 0 to 14
Maximum operating temperature 120 o in H form and 140 o in Na+ form

Anion Resin

Strong base anion exchange resin is a porous type structure based on polystyrene matrix attached with a quaternary ammonium Type 1 group. Notably, type 1 functional group is the most strongly basic functional group available and has the highest affinity for the weak acids such as silicic acid and carbonic acid, that are commonly present during a water demineralization process. The strong base groups that are derived from quaternary ammonium groups, are capable of removing weak acids such as carbonic acid to very low levels. It is applied as moist spherical beads in chloride form providing better resistance to organic matter.

Type Strong base anion exchange resin
Matrix structure Cross linked polystyrene
Functional group Quaternary Ammonium Type 1
Physical form Moist spherical beads
Ionic form Chloride
Particle size 0.3 to 1.2 mm
pH range 0 to 14
Maximum operating temperature 60 o

Mixed Bed Resin

Mixed Bed (MB) Resin is a resulting mixture of cation and anion exchange resins. They are used as polishers to attain low conductivity water, which is required for boiler feed for high-pressure boilers, electronics and electrical discharge cutting machines and pharmaceutical applications.

Mixed bed polishers are utilized as a primary deionisation unit when the salt load is low. They are used in process industry, where demineralisation of pH sensitive products is exhibited. Depending upon the requirements, MB grade resins are applied in custom-designed ratios.

Mixed bed resins are mainly used in the water purification industry for treating process water to achieve demineralized water quality such as after reverse osmosis system.

Its typical applications include:

  • Ultra pure water production
  • Demineralisation
  • Condensate polishing (boiler feed water)
  • Micro-electronics cleaning
  • Pharmaceuticals

Super Charged Resin

Super charged resins are used in highly regenerated, premixed conditions for use in multiple applications such as dye applications, pharma, metal separation etc. They are available as highly regenerated cations and anions for their utilization in regenerable mixed bed units. Premixed resins are compatible to work in different proportions and combinations of cations and anions to attain user and process requirements.

Super charged resin is especially suitable to use in mixed bed units for further filtration after primary demineralization systems in process industries, electronic industries, small industrial plants etc.

DM Plant Resin

Demineralization is performed with help of ION Exchange, RO, and electrodialysis. RO and electrodialysis are performed to remove the dissolved solids with the help of membrane process whereas Ion exchange is softening process which is mostly used to remove the hard minerals such as calcium, magnesium from the water or wastewater. In this process, Hydrogen (H+) and Hydroxide (OH-) are used to exchange the negative and positive ions.

ion-exchange-regin

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