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Anionic and Cationic Resin

Anionic and Cationic Resin

Anionic and cationic resins are polymers with very strong absorption and binding power that are used in various industries, including water treatment. These small particles, which have two charged poles, have high ion exchange power and will have different applications based on whether they are cations or anions. safe comfort; The provider of water and wastewater treatment chemicals will continue to introduce the characteristics of strong and weak anionic and cationic resins and the characteristics of each, and will also review the price and how to buy them.

What is resin?

Resins are small particles and polymers that are prepared from the gum of trees in their natural samples and the synthetic type that is used in the industry is prepared in a laboratory. These particles generally have two non-identical poles, and for this reason, they strongly participate in the exchange of environmental ions and lead to strong connections. As it is clear from the names of these two groups of resins, in the cationic type there is an active positive pole and in the anionic type there is an active negative pole for ion exchange. For this reason, the types of ions that these two groups absorb and their application will be different.

Regardless of the charge in the poles of these polymer beads, it can be said that the resin is very small beads with a radius of 0.5 to 0.25 mm, which has a great effect in reducing water hardness.

What is mixed bed resin?

Anionic and cationic resins each have specific characteristics and target different ions. According to the characteristics of the desired fluid for purifying and removing ions and what compounds are in it, the type of resin used will be different. In some industries, due to the very high degree of purity that is required, both types of cationic and anionic resins are used together. The substrates that use both anionic and cationic resins together are called mixed substrate resins.

What is a cationic resin?

In addition to the differences in the type of rich and active resin pole, the type of ions that these fine polymer grains absorb will be different according to the strength or weakness of the cation or anion. Accordingly, cationic resins can be grouped as follows:

Strong cationic resin

This group of resins have an active positive pole and are a very practical option for water hardness. Strong cation resins are able to replace calcium and magnesium in water as well as metal ions with sodium. In other words, this group of resin grains is effective for removing or reducing the permanent hardness of water, but of course, it works very poorly against manganese and iron and loses its efficiency. Among the strong cationic resins, we can mention polystyrene sulfonate, which has active sulfuric acid.

Weak cationic resin

This group of resins is effective for reducing the temporary hardness of water, and in other words, it removes cations that lead to water alkalinity. Among the weak cationic resins, we can mention carboxylic acid, whose functional group is COOH, and they have a high efficiency against the reduction of temporary hardness agent ions.

What is anionic resin?

This group of resins have active anions and are able to remove nitrates and chlorides in water. This group of resins also have different functions based on their type, which are grouped as follows:

Strong anionic resin

This group of resins have active anions and are a very practical option to reduce the amount of chlorine in water as well as mineral acids. In the strong type, these resins are able to destroy the anions in the water.

Weak anionic resin

Weak anionic resins have 4 amino groups and are able to remove the anion of acids such as nitric acid and hydrochloric acid. A very important point is that anionic resins are not able to remove the silica in water and have a higher resistance than the strong anionic type.

The difference between cationic and anionic resin

As mentioned, in some resin grains, there are active cations, and for this reason, they have a high power in exchanging and removing the existing cations. On the other hand, anionic resins are able to remove anions in water such as nitrates and chlorides and replace them with sodium present on the resin. Cationic resins are used to remove ions such as calcium, magnesium and iron.

Another difference between anionic and cationic resins is the type of material used for their regeneration. The continuous use of both types of resins will eventually lead to a decrease in their efficiency, and for this reason, anionic resins are regenerated with carbon hydroxide and cationic resins with sulfuric acid. It should also be noted that the amount of resin required to remove ions is different in both anionic and cationic types. In general, the required amount of resin is obtained from the ratio of the removed ions to the total ions in the water.

Strong Acidic Cation Resin

One of the strongest types of resin is the cationic type of strong acid, which removes all the cations in water very quickly. One of the most important features of this type of resin is that it does not change the pH of water, quickly removes all ions and cations, and can be regenerated with acidic solutions, water and salt.

Weak Acidic Cation Resin

Considering that acrylic-based resins are not able to remove all the cations in water, that is why they are called weak acids. According to the type of resin application and the degree of purity required from water and other fluids, both types of strong and weak acids can be used together.

Strong Base Anion Resin

Strong basic anion resins are the most widely used type of resin for separating anionic ions in acids. These resins can be divided into two functional groups, I and II, which have different properties. One of the most important features of this type of resin is its very high power in removing all anions.

Weak Base Anion Resin

Another type of resin is only able to remove anions in strong acids and cannot be used to remove carbonic acid and silicic acid.

The most widely used types of ion exchange resins

In addition to the above categories, ion exchange resins can be divided into several groups according to the type of ions that are absorbed and their exchange occurs. Among the widely used examples of resin grains in various industries, the following can be mentioned:

Calcium and Magnesium Selective Ion Exchange Resin: This type of resin is able to remove calcium and magnesium and reduce water hardness.

Iron and Manganese Selective Ion Exchange Resin: This type of resin, which has a high power in removing iron and manganese, is used in the extraction of minerals and also in the treatment of electroplating wastewater.

Boron Selective Ion Exchange Resin: This type of resin is in the weak anion group and has a high power in removing boron from the desired fluid.

Arsenic Selective Ion Exchange Resin: Arsenic, which is one of the most dangerous chemical elements, is removed with this type of resin in the shortest time.

Nitrate Removal Resin (Nitrate Selective Ion Exchange Resin): Due to the adverse effects of an excessive amount of nitrate in water, this type of resin is used to remove this element.


Application of anionic and cationic resin in water purification

As mentioned throughout the text, resin grains are very effective in reducing the hardness of water, as well as removing harmful particles in it and purifying water. Among the most important applications of anionic and cationic resins, the following can be mentioned:

Reducing water hardness with resin

The presence of calcium, magnesium and other particles and metals in water has led to an increase in its hardness, which causes many problems for human health and reduces the quality of water. For this purpose, equipment such as resin hardeners are used, in which a bed of silica and resin grains are implemented. The available silica reduces the volatility of the resin grains. Passing water over the resin substrate causes calcium and magnesium ions to be replaced by sodium in the resin. The constant replacement and exchange of calcium and magnesium ions with sodium on the resin grains eventually leads to a decrease in the strength of the resin bed. For this reason, it is necessary to regenerate the resin in different ways, including the use of salt and water solution and reverse washing.

Water clarification with resin

Among other applications of anionic and weak cationic resin beads, we can mention the removal of chlorine, toxic metals and lead in water. Purification or clarification of water with resin means removing the substitution of sodium and calcium ions in them. Of course, it should be noted that to increase the efficiency, it is necessary to use a carbon filter at the same time along with the resin, because the power of the resin to remove these ions is low.


Application of resin in textile industry

One of the most important cases is the use of ion exchange resins in the textile industry and it is used to produce nylon fibers and also to improve dyeing. In the production process of nylon used in textile, ions and impurities must be removed, which is possible with polymer resin beads. In addition, the ion exchange resin grains will eliminate the impurities in the dyeing stage and will lead to the improvement of the color quality of the fabrics.


Among other cases, the application of anion and cation exchange resin is to reduce the hardness of water and prevent sediment formation on textile equipment and machines.


Application of resin in pharmaceutical industry

Ion exchange resin has been widely used in the pharmaceutical industry and its importance is at a high level. One of the most important cases of its use is the use of resin as an additive to tablets. The desired ions are placed on the resin grains and after entering the digestive system, they are released and enter the body. In addition, these polymer grains are used for water purification in the drug production process and collect and remove ions and solutes.




Application of resin in nuclear power plant

In the nuclear industry, there is a need for high-purity water in the bad mix and other parts so that the solutes in it do not lead to changes in the reactions. One of the most important applications of cationic and anionic resins is water purification and reduction of ions and solutes in it. Considering that the resin has a very high resistance to contact with other chemicals and does not react with them and does not change its structure, for this reason it can be used for water purification in nuclear industries.




Application of resin in food industry

In the food industry, the taste and aroma of the produced materials is very important, and for this reason, resin seeds can be used for this purpose. So that one of the main materials needed in chromatographic separation are cationic and anionic resins, which are used in the food and sugar industry. Ion exchange resins, as their name suggests, have a high power in ion exchange. For this reason, they can be used for precipitation and removal of acidic substances in the process of food production.
It should also be noted that resin is widely used in the sugar industry. These seeds are used not only in the process of removing the color of sugar, but also in the process of producing it from sugarcane. In addition, in the production of drinks and juices, these polymer grains are able to improve the color and increase the quality.




The price of anionic and cationic resin

Several factors play a role in determining the rate and price of anionic and cationic resin, the most important of which are the type of resin and the brand of their producer. It should also be noted that the resin is often imported, and for this reason, currency fluctuations affect the price of anionic and cationic resin. To inquire about the price, you can contact the sales experts of Ayman Ayman.




Buy anionic and cationic resin

Considering the huge use of resin in the water purification and purification industry and reducing its hardness and the effects that each type of these polymer grains have on water, it is necessary to pay attention to their quality at the time of purchase. Before buying anionic and cationic resin, Asaish Afza Ayman experts explain the features and applications of each one and provide design advice.


Anionic and cationic resin brands
Chinese prolite resin

Asaish Afza Ayman is the representative of Prolite resin in China and offers all kinds of anionic and cationic resins in different sizes. These products are offered in wholesale and retail form and it is possible to send them all over Iran. The resins produced by this brand have a high variety and one of the most used of them is the C100H model. To learn more about the details and features of these materials, you can use the free consultation of Asaysafza Ayman before buying.

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Asayesh Afza Imen Company started its activity in the 70s with the aim of providing engineering consulting services in the construction and operation of water and wastewater treatment systems. This group operates by taking possession of the world’s technical knowledge and relying on new engineering technologies in the field of design, construction, installation and commissioning of water (industrial, domestic, swimming pool) and sewage systems.

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