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Ion exchange resins are insoluble polymers formed by crosslinking of polystyrenes with different functional groups, which act as a medium for ion exchange reactions.
The resin matrix contains ion-exchange sites, where the functional groups of positively or negatively charged ions are affixed to form a polymer network. This built network has the potential to attract the ions of opposite charges and facilitate the ion exchange process. The resins are normally present in the form of white or yellow porous microbeads, membranes, or granules. They have pores which provide a large surface area to trap and release the ions during ion exchange reactions.
When immersed in a solution, the resins swell by absorbing the solution. However, the swelling extent depends on the polymeric structure of resins and the concentration of ions in the solution.
Most widely available and used types of resins are made of styrene-divinylbenzene copolymer (or polystyrene). However, there are also some others built from acrylonitrile or methyl acrylate (acrylic).
The ion exchange resins have diverse lab and industrial applications. For example, they can be used in water treatments of drinking water and wastewater, demineralization of impure water, and chromatography of a mixture of different components.
The chemical and physical properties of the ion exchange resins can be altered based on the specific lab applications. However, the two most common types of ion exchange resins are cation exchange resins and anion exchange resins.
Ion exchange resins contain electrically charged functional groups that are either sulfonic or carboxylic acid salts or quaternary ammonium salts. Based on their charges, the ion exchange materials are classified into two main groups: cation exchange resin and anion exchange resins.
Cation Exchange Resins contain negatively charged functional groups, which attract positively charged ions in solution. One of its applications is separating positive ions from contaminated water.
Cation Exchange Resins are also further classified into two sub-groups:
Anion Exchange Resins contain positively charged functional groups, which attract negatively charged ions in solution. They contain amine as a functional group in their matrix.
These also are used to purify water as well, by removing negatively charged contaminants. The two subcategories of anion resins are:
Other than the cation and anion exchange resins there are some chelating resins. They consist of polystyrene with variant functional groups, including aminophosphonic, triethylammonium, and thiol, and almost always bind with cations. These resins are used to remove heavy metals and other materials from mixtures with a high degree of selectivity.
Different types of resins have different shapes, sizes, and structures. The process used for the synthesis of resins is called polymerization. And, the condition of polymerization of the backbone polymer determines the porosity and structure of the ion exchange resins.
Based on their structure and size, the ion exchange materials are mainly of two types:
Ion Exchange Resins have a range of applications, including biodiesel filtration, water softening, removing impurities from water and other solutions, and demineralization. Some of these applications are explained below.
Water softening is the process of removal of divalent cations from the water. Earlier zeolites were being used for the process. They could be regenerated by flowing concentrated NaCl solution through them to release CaCl2 and MgCl2. However, they are seldom used for water softening.
Later on, ion exchange resins were developed that are of higher capacity and efficacy than zeolites. They have more affinity for magnesium and calcium ions than sodium ions. Therefore, it is necessary to force accumulated hardness ions off the resin beads with a solution of concentrated sodium chloride brine. The resins have many applications in commercial, residential, and industrial areas for water softening.
Ion exchange systems have the potential to purify solutions containing hazardous metal ions by replacing them with innocuous sodium and potassium ions. Thus, they are also applied in water treatment or purification, where activated charcoal (mixed in resins) is used to remove organic contaminants, such as chloride.
Ion exchange processes are used to extract, separate, and concentrate metals. For example, they are used to separate uranium from plutonium and other actinides. For many years, the ion exchange system was the only approach to separate rare-earth metals, such as actinides and lanthanides from each other.
Ion Exchange resins are an efficient approach to replacing acids, alkalis, and metal ion catalysts in a range of chemical reactions, including inversions, hydrolysis, hydration, and polymerization reactions.
It provides many advantages over other systems, which include:
Ion exchange resins are also very commonly used in the lab technique of column chromatography. The resin is the stationary phase which is packed into columns of varying size, which then attracts charged ions present in cell lysate or other biological mixtures (the mobile phase). This is a very common technique used in drug & therapeutic development.
001×7 Strong Acid Cation Exchange Resin
Typical Physical and Chemical Properties:
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001×7 |
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Polymer Matrix Structure |
Crosslinked Polystyrene Divinylbenzene |
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Brownish yellow color to Brown Spherical particles |
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Functional Groups |
-SO3H |
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Ionic Form |
Na+ Form |
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Total Exchange volume, Dry, weight |
≥4.5 mmol/g |
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Total Exchange volume, Wet, volumetric |
≥1.9 mmol/mol |
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Moisture Retention, Na+ form |
45-50% |
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Particle Size Range ≥95% |
0.315-1.25mm |
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Uniformity Coefficient |
≤1.6 |
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Effective Particle Size |
0.4-0.7mm |
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Particle Size Min % |
<0.315mm ≤1.0 |
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Reversible Swelling |
Na+ → H+ (max.) |
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Shipping Weight (approx.) |
770 -870g/l |
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Specific Gravity, moist Na+ Form |
1.250-1.290 g/ml |
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Temperature Limit |
120°C |
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pH Range, Stability |
1 - 14 |
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001×8 Strong Acid Cation Exchange Resin
Typical Physical and Chemical Properties:
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Items |
001×8 |
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Polymer Matrix Structure |
Crosslinked Polystyrene Divinylbenzene |
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Physical Form and Appearance |
Brownish yellow color to Brown Spherical particles |
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Functional Groups |
-SO3H |
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Ionic Form |
Na+ Form |
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Total Exchange volume, Dry, weight |
≥4.4 mmol/g |
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Total Exchange volume, Wet, volumetric |
≥2.0 mmol/mol |
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Moisture Retention, Na+ form |
45-48% |
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Particle Size Range ≥95% |
0.315-1.25mm |
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Uniformity Coefficient |
≤1.6 |
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Effective Particle Size |
0.4-0.7mm |
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Particle Size Min % |
<0.315mm ≤1.0 |
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Reversible Swelling |
Na+ → H+ (max.) |
8% |
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Shipping Weight (approx.) |
780 -880g/l |
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Specific Gravity, moist Na+ Form |
1.250-1.300 g/ml |
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Temperature Limit |
120°C |
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pH Range, Stability |
1 - 14 |
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001×10 Strong Acid Cation Exchange Resin
Typical Physical and Chemical Properties:
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Items |
001×10 |
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Polymer Matrix Structure |
Crosslinked Polystyrene Divinylbenzene |
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Physical Form and Appearance |
Brownish yellow color to Brown Spherical particles |
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Functional Groups |
-SO3H |
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Ionic Form |
Na+ Form |
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Total Exchange volume, Dry, weight |
≥4.2 mmol/g |
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Total Exchange volume, Wet, volumetric |
≥2.1 mmol/mol |
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Moisture Retention, Na+ form |
38-45% |
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Particle Size Range ≥95% |
0.315-1.25mm |
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Uniformity Coefficient |
≤1.6 |
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Effective Particle Size |
0.4-0.7mm |
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Particle Size Min % |
<0.315mm ≤1.0 |
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Reversible Swelling |
Na+ → H+ (max.) |
7% |
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Shipping Weight (approx.) |
800 -900g/l |
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Specific Gravity, moist Na+ Form |
1.280-1.340 g/ml |
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Temperature Limit |
120°C |
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pH Range, Stability |
1 - 14 |
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201×7 Strong Base Anion Exchange Resin
Typical Physical and Chemical Properties:
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Items |
201×7 |
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Polymer Matrix Structure |
Crosslinked Polystyrene Divinylbenzene |
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Physical Form and Appearance |
Light yellow to Golden color Spherical beads |
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Functional Groups |
–N+(CH3)3 |
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Ionic Form |
CL- Form |
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Total Exchange volume, Dry, weight |
≥3.60 mmol/g |
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Total Exchange volume, Wet, volumetric |
≥1.35 mmol/mol |
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Moisture Retention, CL- form |
42-48% |
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Particle Size Range ≥95% |
0.315mm-1.25mm |
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Particle Size Min % |
<0.315mm ≤1.0 |
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Uniformity Coefficient |
≤1.6 |
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Effective Particle Size |
0.400~0.700mm |
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Reversible Swelling CL-→ OH –(max.) |
18-22% |
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Shipping Weight (approx.) |
670 -730g/l |
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Specific Gravity, moist CL- Form |
1.070~1.100 g/ml |
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Temperature Limit |
80°C |
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pH Range, Stability |
1 - 14 |
MB400 mixed bed ion exchange resin
MB400 electronic grade resin is composed of gel-type strong acid cation exchange resin and gel type strong basic anion exchange resin. It is suitable for the preparation and refining of ultra-pure water. It is widely used in water fields such as electronics, optical instruments, medicine, cosmetics, window cleaning and precision machining.
MB400 electronic grade mixed bed ion exchange resin has excellent kinetics and exchange capacity, high purification purity and regeneration level, excellent physicochemical stability and penetration resistance.
High purity water can be produced with resistivity more than 15MΩ·cm.
Typical Physical and Chemical Properties:
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Items |
Cation Resin |
Anion Resin |
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Polymer Matrix Structure |
Gel PolyStyrene Crosslinked with DVB |
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Classification Type |
Gel type |
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Functional Group |
-SO3 |
-N(CH3)3 |
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Ionic Form |
H |
OH |
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Total Exchange volume, volumetric, mmol /ml |
≥ 2.00 |
≥ 1.30 |
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Ratio of Cation and Anion Resin (V/V) % |
40.0 |
60.0 |
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Water Retention Capacity % |
57-65 |
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Particle Size Range mm |
0.315 – 1.25 ≥ 95% |
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Effective Particle Size mm |
0.40 – 0.60 |
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Uniformity Coefficient |
≤ 1.60 |
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Wet Density g/l |
700 – 740 |
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Uniformity Coefficient |
≤ 1.60 |
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Storage temperature |
5 - 40°C |
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Maximum Temperature: |
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Working Conditions |
80°C |
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Regenerative Conditions |
60°C |
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H Form Rate % |
≥ 99.0 |
— |
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OH Form Rate % |
— |
≥ 90.0 |
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