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CONTENTS
Introduction
Principle of Deionizer
Types
Two –bed deionizer
Mixed-bed deionizer
Working of deionizer
Applicati...

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INTRODUCTION
For many laboratory & industrial applications high
Purity water which is essential free from ionic
contamina...

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 Deionization water purification can be done by
using ion exchange method.
 Deionizers are most commonly used when
ionic...

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Deionizer

  1. 1. CONTENTS Introduction Principle of Deionizer Types Two –bed deionizer Mixed-bed deionizer Working of deionizer Applications of deionizer
  2. 2. INTRODUCTION For many laboratory & industrial applications high Purity water which is essential free from ionic contaminates is required and this type of water is produced by “DEIONIZATION”. Deionization is the process by which mineral ions in water are removed and the apparatus used for deionization is known as deionizer.
  3. 3.  Deionization water purification can be done by using ion exchange method.  Deionizers are most commonly used when ionic contamination is such that reverse osmosis alone cannot be relied upon to produce water of acceptable quality.
  4. 4. Principle Of Deionizer  “Deionizers remove both cations & anions, releasing hydrogen ions (H+) in exchange for the former and hydroxyl ions (OH-) for the latter. The hydrogen and hydroxyl ions subsequently combine to form pure water”.  The following Figure illustrates the ion exchange process
  5. 5. Types of deionizer There are two types of deionizer . These are :  Two bed deionizer  Mixed bed deionizer
  6. 6.  The two bed deionizer consists of two vessels –one containing a cation exchange resin in the hydrogen (H+) form and the other containing an anion resin in the hydroxyl ( OH-) form .  Water flow through the cation column , where upon all the cations are exchanged for hydrogen ions .  The same principle applies when considering anion – exchange .  The decationised water then flows through the anion column .This time ,all the negatively charged ions are exchanged for hydroxide ions which then combine with the hydrogen ions to form water .  The specific resistivity of this water is about 250,000ohms/cm.
  7. 7.  In mixed bed deionizers the cation – exchange and anion exchange resins are intimately mixed and contained in a single pressure vessel .  The thorough mixture of cation- exchangers and anion –exchangers in a single column makes a mixed – bed deionizer equivalent to a lengthy series of two- bed plants . Water quality obtained is appreciably higher .  More sensitive towards the impurities in the water supply and yield water of 1,000,000ohms/cm 7upto 18,300,000ohms/cm.
  8. 8. The hard water is passed through cation exchange column ,which removes all the cations ( Ca2+,Mg2+) from it and equivalent amount of H+ ions are released . 2RH+ + Ca2+ → R2Ca2+ + 2 H+ 2RH+ + Mg 2+ → R2Mg2+ + 2H+ For every monovalent cation ,one hydrogen ion is exchanged and for every divalent cation , two hydrogen ions are exchanged .
  9. 9.  After cation exchange column , the hard water is passed through anion exchange column, which removes all the anions (SO4 2- , Cl-) and equivalent amount of OH- ions are released from this column to water. ROH + Cl- → RCl- + OH- 2ROH + CO3 2- → R2CO3 2- + 2OH- H+ & OH- ions released from cation & anion exchange column respectively get combine to form water . H+ + OH- → H2O This water is know as deionized or dimineralized water.
  10. 10.  Boilers feed water , Textiles, Pharmaceuticals, Chemicals , Swimming pools, Potable Water , Hospitals, Automobile, Battery and Fertilizers.  Ion Exchange Plants . Industrial DM Plant. Mixed Bed Demineraliser . Pharmaceutical industry. Power plant. Chemical industries . Textile industries.
  11. 11.  www.wikipedia.com  www.google.co.in

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