Deionization, as the name explains is a term normally used for reduction of charged ions to very low levels. Deionization is also alternatively called as Demineralization. The deionization is normally a two stage process. In first stage cations & in second stage anions are removed respectively. Sometimes a polisher unit called mixed bed is also employed when the water quality requirement is stringent.
DI / DM Water Applications:
» Different industrial applications in Chemical and Engineering Industries
» Chemical Processing, Powder Coating, Dyeing & Printing House
» Pharmaceuticals and Cosmetics
» Semiconductor and Electronic Industries
» Food and Beverage Industries
» Hospitals and Laboratories
» Lead Acid Battery Top Up.
» Steam irons and Humidifiers
» Autoclaves, Water Cutters, Laser Cutters, Jewellery Manufacture
» All types of Power Manufacturing Machine and Generator
» High pressure Boiler Feed
» All types of high capacity Air Condition Plant
The DI/DM process is carried out in ion exchange resin columns where the water with dissolved ions/minerals is passed through resin bed. The cations and anions are exchanged with loosely attached Hydrogen (SO3-H/COO-H) or Hydroxyl (N-OH/NH2-OH) ion of the resin bead.
The ion exchange resins, commonly also called IX resins are primarily manufactured by cross polymerization of Styrene & Divinyl Benzene. The cross linking is done from 6 -12% based on required hydraulic as mechanical properties. The IX reactions are reversible & resins need to be regenerated by acid and alkali re-generants once these are exhausted. Normally strong Acids like Hydrochloric/Sulfuric & Caustic is used. Generally 4- 8% concentration is used for regeneration, however it differs with respect to the incoming water quality.
DM/DI systems should contain a combination of purification technologies, each designed to remove a particular range of contaminants.
No single technology alone will produce high quality DI water efficiently or economically.
The required scheme is normally decided based on feed water quality, outlet quality required and flow rate between two regenerations. Following schemes are normally employed:
- Strong Acid Cation – Strong Base Anion
- Strong Acid Cation – Degasser – Strong Base Anion
- Strong Acid Cation – Degasser – Weak Base Anion – Strong Base Anion
- Weak Acid Cation –Strong Acid Cation – Degasser – Weak Base Anion – Strong Base Anion
A Mixed Bed is added if the quality requirements are stringent.
DM/DI Systems with Reverse Osmosis in combination will provide higher quality DI water and lower its production
Reverse Osmosis will remove 95 – 98% leaving deionization to remove the reminder.
MDC Water offers a complete range of DI/DM systems to meet your need for DI/DM water, all our units are manufactured with high quality IX resins and parts.
We offer high quality DI/DM systems because the configurations of DI/DM systems are sometimes rather difficult and therefore must be designed and built with effective technology in order to guarantee the required results.
We work closely with you to ensure that you have the perfect DI/DM system for your application.