Deionisation resin remove ions from feed water. As the water passes through the ion exchange deionisation resin beads, hydrogen and hydroxide ions are chemically exchanged with dissolved minerals to form water.
Deionisation resin beds or columns are made from cation-exchange resins and anion-exchange resins either in separate beds or packaged together. Different technologies are referred to as co-current, counter-current and mixed bed. Most commercial resins are made of polystyrene sulfonate and oppositely charged ion exchanging sites are introduced after polymerisation. Cation-exchange media use sulfonic acid groups to exchange a hydrogen ion for any cations they encounter (e.g., Na+, Ca++, Al+++) and anion-exchange resins use quaternary amino groups such as polyAPTAC to exchange a hydroxyl for any anions (e.g., Cl-, NO3-, SO4–). When the hydrogen ion from the cation exchanger unites with the hydroxyl ion of the anion exchanger pure water is formed.
Deionisation is the only technology which produces the resistivity requirement for Type 1 ultrapure reagent grade water. The electrical resistivity of ultra-pure water is 18.2 MΩ-cm. This low conductivity can only be achieved with water dissociation equilibrium which requires the production of H+ and OH− ions in the presence of dissolved monatomic gases.
Lanlang ® TY MB-2 deionisation resin used for Electronic industry, Dental instrument, Laboratory.
Lanlang has over 15 years’ experience in ion exchange resin technologies to help lower costs and waste volumes while increasing product quality. For more information or to get in touch, contact us to set up a consultation with an engineer or request a resin quotation.