Sunday 17 November 2019

Ion exchange


introduction The process by which a mixture of similar charged ions can be separated by using an ion exchange resin Ion ...
Principle Reversible exchange of ions b/n the ions present in the solution and those present in the ion exchange resin. ...
Anion exchange Separation of anions using Anion exchange resin Solid-OH- + A-  Solid-A- + OH- (solution) (solution) T...
Classification of resins  According to the chemical nature  1. Strong cation exchange resin 2. Weak cation exchange resi...
Classification of resins  According to the chemical nature  1. Strong cation exchange resin 2. Weak cation exchange resi...

Functional groups present in different ion exchange resins Strong cation exchange resin  SO3H Weak cation exchange resi...

Common ion exchange resins Class of resin Nature pH range applications Cation- strong Sulfonated polystyrene 1-14 Fraction...

Common ion exchange resins Class or resin Nature pH range Applications Anion – strong Quaternary ammonium polystyrene 0-12...

Structural types of ion exchange resins 1. Pellicular type with ion exchange film 2. porous resin coated with exchange b...

Structural types of ion exchange resins 1. Pellicular type with ion exchange film: The particles have a size of 30-40ยต w...

Structural types of ion exchange resins 3. macroreticular resin bead: A reticular network of the resin is seen superficia...

Physical properties or resins 1. Particle size: 50-200 mesh fine powder, should allow free flow of mobile phase, should ...

Physical properties or resins When less cross linking agent is present, they are less rigid, but swell more Separation w...
Practical requirements 1. column material & dimensions: Glass, stainless steel or polymers which are resistant to strong...
Selection of ion exchange resin Depends upon 1. type of the ions to be separated – cations or anions 2. nature of the i...
Packing of the column Wet packing The resin is mixed with the mobile phase & packed in the column uniformly The sample ...

Mobile phase Organic solvents are less useful & they are not used at all. Only diff strengths of acids, alkalies & buffe...

Development of the chromatogram & elution 1. isocratic elution technique 2. gradient elution technique

Development of the chromatogram & elution 1. isocratic elution technique 2. gradient elution technique

Analysis of the elute Spectrophotometric method Polarographic method Conductometric method Amperometric method Flame ...
Regeneration of the ion exchange resin The ion exchange resin after separation may not be useful for next separation as e...
Factors affecting ion exchange separations 1. Nature & properties of ion exchange resins:- Cross linking & swelling 2. N...
Factors affecting ion exchange separations  B) Size of ions: for similar charged ions, exchange increases with decrease i...

applications Softening of water Demineralisation or deionisation of water Purification of some solutions to be free fro...



thanks to

Dr.M.Prasad Naidu







on

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