How do you regenerate an ion exchanger?
The strong acid cation exchanger resin is regenerated with sulphuric or hydrochloric acid, which effectively strips off the calcium, magnesium and sodium from the resin, substituting hydrogen. Hydrochloric acid is typically applied at between 4 and 6%.
What is regeneration of ion exchange plant How is it carried out?
Regeneration is carried out by causing a concentrated solution of A’ ions to flow through the exchanger in the same direction. Coutercurrent regeneration: Regeneration is carried out by causing a concentrated solution of A’ ions to flow through the exchanger in the opposite direction.
What is the most common regeneration method used today?
In water treatment, the two most common salts used for regenerating cation and anion water softeners are sodium chloride (NaCl) and potassium chloride (KCl). Sodium chloride is less expensive and more abundant than potassium chloride, which is why it is the preferred regenerate in almost all applications.
What is the process of ion exchange?
Ion exchange is a water treatment method where one or more undesirable ionic contaminants are removed from water by exchange with another non-objectionable, or less objectionable ionic substance.
How do regenerate the exhausted anion exchange resins in demineralisation process?
When used in demineralization, SAC resins remove nearly all raw water cations, replacing them with hydrogen ions, as shown below: The exchange reaction is reversible. When its capacity is exhausted, the resin can be regenerated with an excess of mineral acid.
How are spent resins regenerated?
After a number of treatment cycles, the used resin becomes spent or exhausted and needs to be regenerated to eliminate the accumulated ions. The spent ion exchange resin must be treated with a regenerant solution containing ions that exchange with the accumulated ions in the resin to recharge it.
What is resin in ion exchange?
An ion-exchange resin or ion-exchange polymer is a resin or polymer that acts as a medium for ion exchange. It is an insoluble matrix (or support structure) normally in the form of small (0.25–1.43 mm radius) microbeads, usually white or yellowish, fabricated from an organic polymer substrate.
How is exhausted ion exchange resins regenerated?
The exhausted cation exchange resin can be regenerated by the moderately concentrated sodium hydroxide solution.
What is used for regeneration anion exchanger?
Strong base anion exchangers are regenerated with a 4% sodium hydroxide solution. As with cation regeneration, the relatively high concentration of hydroxide drives the regeneration reaction.
Is ion exchange a chemical or physical process?
reversible chemical reaction
Ion exchange is a reversible chemical reaction where dissolved ions are removed from solution and replaced with other ions of the same or similar electrical charge. Not a chemical reactant in and of itself, IX resin is instead a physical medium that facilitates ion exchange reactions.