A strong base anion exchange resin (SBAER) is a type of ion exchange resin that's used to remove anionic contaminants and produce demineralized water:

A strong base anion exchange resin (SBAER) is a type of ion exchange resin that's used to remove anionic contaminants and produce demineralized water: 

Composition

SBAERs are made of styrene and divinyl benzene copolymers, and have a quaternary ammonium group functional group. 

Types

There are two types of SBAERs, Type I and Type II, which differ in alkalinity strength: 

Type I: Has a trimethyl ammonium group and is more strongly basic than Type II. It's preferred when low silica residuals are required in treated water. 

Type II: Has a dimethylethanol ammonium group and is less basic than Type I. It's recommended when silica effluent quality isn't critical and the raw water has a high chloride or sulfate content. 

Applications

SBAERs are used in dealkalization, deionization, demineralization, desilicization, and organic removal. 

Regeneration

SBAERs are usually regenerated with a 4% NaOH solution. They require more regenerants than the theoretical amount due to their strong basicity. 

Hydrolysis

SBAERs undergo hydrolysis, which converts the strong base groups into weak base groups. This results in a gradual loss of the ability to remove weak acids like silica and carbon dioxide. Type II resins undergo hydrolysis faster than Type I resins.