Role of Weak Acid Cation Resin in Water Treatment

摘要

Weak acid cation(WAC)resin plays an important role in water treatment.It is usually manufactured from acrylic acid and divinyl benzene(DVB)as a crosslinking agent,although some manufacturers make it from methacrylic acid or its derivatives.It is a widely used unit in a demineralisation plants for dealkalisation of water.The total capacity of WAC resin at 210 g/l as CaCO_3 is higher than other ion exchange resins.The resin is regenerated with dilute acid using near stoi-chiometric quantity.Hence,the waste water generated during regeneration is almost neutral.WAC resin operates in an alkaline pH range and exhibits large volume change when converted to different forms.Hence,it is called the workhorse of water treatment processes.