Mixed Ion Exchange Resin For Water Deionization Application

Standard mixed ion exchange resin is a combination of cation (H+) and anion (OH-). Water treated with mixed bed resin removes most of the cations and anions and results in various levels of purity. Standard mixed bed resin has 2 components – It consists of Strong Acid Cation (8% Crosslink) in...
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Standard mixed ion exchange resin is a combination of cation (H+) and anion (OH-). Water treated with mixed bed resin removes most of the cations and anions and results in various levels of purity.

Standard mixed bed resin has 2 components – It consists of Strong Acid Cation (8% Crosslink) in the Hydrogen (H+) form and Type 1 Strong Base Anion in the Hydroxide (OH-) form. The manufacturer processes and rinses mixed bed to various levels of purity prior to shipment. Once installed mixed bed resin is ready for immediate service. Care should be taken to prevent separation during installation and shipment to prevent lower throughput.

Mixed ion exchange resin is used to produce deionized or demineralized water. Use of mixed bed resins for residential applications is uncommon. Depending on its level a purity, deionized water is aggressive and potentially strips metals from fixtures, appliances and pipes. Despite its level of purity, drinking deionized water is not recommended.

mixed ion exchange resin

Terminology Common to Use of Deionization or Demineralization

Separates – Cation resin or anion resin of any type

Separate beds – Single cation (H+) tank; single anion (OH-) tank

  • Depending on water analysis and conditions different types of cation and anions are applied.

  • Multiples of each type may be installed

Mixed bed – tank containing a mixture of cation and anion resin

  • Depending on water analysis and conditions different types of mixed bed resins are applied

  • Multiples of each type may be installed

DI Train

  • Combination of multiple vessels beginning with cation and ending with mixed bed.

SDI

  • Service DeIonization – delivery of regenerated DI bottles or tanks of various sizes to end-users requiring pure water for production or boiler feed.

  • These locations lack fully functioning (no regeneration) deionizing or softening systems and typically pay rent and regeneration fees when the spent or exhausted tanks are replaced.

  • Sale is typically on a contractual basis.

PEDI

  • Portable Exchange Deionization – same as SDI

Mixed Bed Polishers

  • Commonly placed after RO systems, mixed bed resin removes or reduces unwanted ions thus polishing the water to a higher level of purity.


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