- Strong acidic cation resins
- Weak acidic cation resins
- Strong acid cation exchange resin,gel structure
- Macroporous strongly acidic styrene cation resins
- Cation resins for Ultra Purity Water
- Cation resins for Ultra Purity Water
- Gel and strong acidic cation resins
- Macroporous crylic acid Anion resins
- Macroporous Anion resins
- Anion resins for Ultra Purity Water
- Gel and strong basic anion resins
- Mixed bed resin for Wire-Cutting
- Mixed bed resin for Wire-Cutting
- Mixed bed resins for High Pure Water
- Mixed bed resins for High Pure Water
- Mixed bed resins for Ultra Pure Water
- Mixed bed resins for laser systems
- Closest competitive equivalents
How Does Ion Exchange Work?
2013-09-29 Source: Author:佚名 Read:次
Beds of ion exchange resins efficiently remove ionized species from water by exchanging them for H+
and OH- ions. The resins are sub 1 mm porous beads made of highly cross-linked insoluble polymers
with large numbers of strongly ionic exchange sites.
How Ion Exchange Removes Ionized Species from Water
Ions in solution migrate into the beads, where, as a function of their relative charge densities (charge per
hydrated volume), they compete for the exchange sites.
Deionization beads are either cationic or anionic and exchange either hydrogen ions for cations e.g.
sodium, calcium and aluminium or hydroxyl ions for anions e.g. chloride, nitrate and sulfate.
The hydrogen ion from the cation exchanger unites with the hydroxyl ion of the anion exchanger to
form pure water.
Beds of ion exchange resins are available as cartridges or cylinders and are typically used
for a period of time and then replaced, when cations and anions have replaced most of the H+
and OH- active sites in the resins.
Advantages and Restrictions
Advantages:
Removes dissolved ions, up to up to 18.2 MΩ-cm, TOC < 1ppb
Regenerated by deionization using acid and bases
Cost effective water purification solution
Restrictions
Does not effectively remove bacteria, organics, particles or pyrogens
Finite capacity - once all ion sites are occupied, ions are no longer retained