Deionisation Resin

Deionisation resin is an ion exchange material used in water treatment, mainly for removing ions from water, thus improving the purity of water. The resin works through an ion exchange process, exchanging cations and anions in the water with hydrogen and hydroxide ions on the resin to achieve deionisation.

 

Deionisation resins are usually found in the form of small particles with a porous structure that provides a large surface area for ion exchange. These resins are classified into two types: cation exchange resins and anion exchange resins. Cation exchange resins remove mainly positive ions from water, such as sodium, calcium and magnesium, while anion exchange resins remove negative ions from water, such as chlorides, sulphates and bicarbonates.

 

Deionisation resins are commonly used to prepare ultrapure water in laboratory and industrial applications, particularly in the semiconductor manufacturing, electronics and pharmaceutical industries, where high purity deionised water is required to ensure product quality. For example, in laboratory ultrapure water systems, mixed-bed deionisation technology is often used, combining strongly acidic cation and strongly basic anion resins to achieve deionised water with the highest resistivity and low total organic carbon (TOC).

 

In addition, deionisation resins are also used in fuel cell cooling systems to remove conductive ions from the coolant to prevent high voltages from being transferred through the coolant to the entire cooling cycle flow path.

 

The service life of deionisation resins depends on the degree of saturation and the water conditions being treated. The resin fails when it can no longer exchange more ions. At this point, regeneration is required, i.e. cleaning the resin with an acid or alkaline solution to restore its exchange capacity.

Deionisation resins have a wide range of applications in the field of water treatment, effectively removing dissolved inorganic ions from water to produce high purity deionised water. However, they have a limited capacity and need to be replaced or regenerated periodically to maintain their performance.

 

 

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