CSA 121

Strong Acid Cation Exchange Resin

DOSHION CSA 121 has a strongly acidic unifunctional cross linked polystyrene structure containing sulphonic acid groups. It is a high capacity gel type resin with excellent physical and chemical properties specially developed for industrial and domestic water softening applications having high hardness of calcium and magnesium salts. Primarily the resin is supplied in Sodium form and however can also be used in demineralisation and other special applications in H+ form.
DOSHION CSA 121 is highly resistant to attrition and osmotic shocks & offers minimum pressure drop across the resin bed under a wide variety of operating conditions.
PROPERTIES
Matrix Cross linked Polystyrene Gel
Functional group So3 (Sulphonic )
Ionic Form  Na+ -Hydrogen
Physical Form Hard Moist Beads
Particle size (mm) 0.30- 1.20
Moisture Content % 47 – 53 %
Total Exchange Capacity (eq/L) (min) 1.8  Na+ form
Bulk Density / Shipping Weight (gm/L) 800-840
Operating pH Range 0-14
Solubility in common solvents Insoluble
Volume change % (max) : Na+ to H+ 10
SUGGESTED OPERATING CONDITIONS
Operating Temperature (max) °C 120
Minimum Bed Depth cm 75
Regenerant Concentration % 10-16(NaCl)
Regenerant Flow Rate *BV/hr 2 – 4
Regenerant Contact Time Minutes 30
Regeneration Level 100% Kg  M3 of Resin 60-160 (NaCl)
Displacement Rinse Rate *BV/hr 2 – 4
Displacement Rinse Volume *BV 1-2
Fast Rinse Rate *BV/hr 10-40
Fast Rinse volume *BV 4 – 10
Service flow rate *BV/hr 10-40

* Bed Volumes/Hour #Bed Volumes

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