Anionic resin. Strong base derive their functionality from quaternary ammonium exchange sites. The two main groups of strong base anionic resins are Type 1 and Type 2, depending on the type of amine used during the chemical activation process.
Type 1 resins are suitable for total anion removal in all waters, they should be used in waters with high alkalinity and high silicon content.
Type 2 resins also exhibit removal of all anions, but may be less effective in removing silicon and carbon dioxide from waters where these weak acids constitute more than 30% of the total anions. This type of resins are frequently used in water softeners or water softeners.
They are used in deionization columns in demineralizers. Removes anions from water and requires a large amount of regenerant, commonly soda (hydroxidosodium hydroxide – NaOH).
Weak base anionic resins contain the polyamine functional group, which acts as an acid absorber, removing strong acids from the cation effluent stream. These resins should be used in waters with high sulfate or chloride levels, or where alkalinity and silicon removal is required.
The weak base anionic resin is very efficient, requiring less NaOH soda for regeneration. They cannot be used at high pH and may suffer from oxidation or fouling.