Tulsion® Ion Exchange Resins for Water Demineralization

Demineralized water (DI water) plays a critical part in manufacturing various consumer and industrial products. Demineralized or deionized water is produced through demineralization, the process of removing total dissolved solids (TDS) and mineral impurities from the water feed to meet the required specification of certain applications.

Ion exchange resins are one of the top technologies for producing high-purity water free from ionic contaminants. Cation exchange resins are widely used in water softening for their ability to remove water hardness (calcium and magnesium ions) from the feed water and exchange them with sodium ions (Na).
Both anion and cation resins are used in industrial water treatment demineralization systems to produce demineralized water. The most common types of deionization systems are the two-bed deionization system, using cation and anion resins in separate units, and the mixed-bed demineralization system, combining both types of resins in one unit.
Ion exchange resins are also commonly used in the post-treatment polishing of other types of water treatment filtration systems, such as reverse osmosis (RO), ultra filtration (UF), nano filtration (NF), and electrodeionization systems (EDI). Their role in such systems is to remove any remaining impurities or contaminants and ensure the consistency of the water-purity levels.

Demineralization Systems

Demineralization plants must be designed and configured accurately to ensure the optimal efficiency of the plant and that the outlet water quality meets the required water specification. The inlet water quality and capacity requirements are also important in the plant design. Here is a typical scheme for producing distilled water quality:

Pre-filtration → SAC → DEG → SBA → MB

SAC: Strong Acid Cation SBA: Strong Base Anion WAC: Weak Acid Cation WBA: Weak Base Anion
MB: Mixed Bed DEG: Degasser ppm: Parts per million = mg/l (milligrams/lit)

SAC: It removes all cations and regenerates with 5% HCl or 1.5% to 5% H2SO4
(Ca) HCO3   (Ca)       (HCO3)
(Mg) Cl + R H → (Mg) R + H (Cl)
(Na) SO4   (Na)       (SO4)
H2CO3 + Air -> H2O + CO
SAC Outlet Quality:
pH = 2.5 to 3.8
Sodium= < 1 ppm
DEG Outlet Quality:
CO2 = < 10 ppm as CaCO3
SBA: It removes all anions and regenerates with 4%–5% NaOH.
Depending on the application and desired water quality, demineralization plants can have different designs and configurations for the ion exchange process. Here are some examples depending on the output quality required:
    (HCO3)         (HCO3)       
H (Cl) + R – OH → R - (Cl) + H2O
    (SO4)         (SO4)    
SBA Outlet Quality:
pH = 7.5 to 8
Silica= <0.2 ppm
Conductivity= < 5 μs/cm
MB Outlet Quality:
pH= 6.5 to 7
Silica= <0.02 ppm
Conductivity= <0.2 μs/cm

MB: It is used for final polishing. It consists of a stoichiometric mixture of highly regenerated SAC in hydrogen and SBA in hydroxide, respectively. 

Selecting Your Ion Exchange Resins

Selecting the right resin for your system can be challenging. Many criteria need to be considered, including input and output capacity, water feed impurities, required output quality, and regenerant types.

Our teams at ChemPoint and Thermax can help you identify the ideal ion exchange resin for your system. We offer an extensive portfolio of Tulsion® ion exchangers from Thermax specifically designed to meet the needs of your system and the quality required for your water treatment applications. Our ion exchange product range includes:

Anion Exchange Resins:

Cation Exchange Resins:

Mixed-Bed Exchange Resins:

Tulsion® Demineralization Applications and End Uses:


Why Tulsion® Ion Exchange Resins?


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Wide Range of Applications


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