C-8
Prominent Systems' C8-NA resin is a high capacity,
conventional gel polystyrene
strong acid cation exchange
resin designed for use in residential
or industrial water softening equipment.
Cation resin in sodium form
removes hardness ions such as calcium
and magnesium by replacing
them with sodium. When the resin
bed is exhausted the hardness ions
begin to pass through the bed. Functionality
is returned by regeneration
with concentrated sodium or potassium
chloride solution. The capacity
obtained depends largely on the
amount of salt used in the regeneration.
Typically 15 lbs of chemical per
ft
3 is used to obtain maximum capacity
of up to 32,000 grains per ft
3.
Prominent Systems' C8-Na resin is also capable
of removing in the same way
dissolved iron, manganese, and also
suspended matter by virtue of the
filtering action of the bed.
Typical Physical, Chemical & Operating Characteristics
Polymer Structure:
Physical Form and Appearance:
Whole Bead Count:
Functional Groups:
Ionic Form (as shipped):
Shipping Weight, approx.:
Mesh Size (U.S. Std):
Moisture retention, Na+ form:
Swelling, Na+—>H+:
Total Capacity in sodium form:
pH Range, Stability: |
Polystyrene 8% cross linked with Divinylbenzene
amber spherical beads
90% Min.
Polystyrene sulfonate
Na+
850 g/l (53 lb./ft.3)
16-50
45–50%
5% max.
1.9 meq/ml
0–14 |
CHEMICAL AND THERMAL STABILITY
Prominent Systems' C8-Na resin is insoluble in dilute or moderately concentrated acids, alkalies, and in all
common solvents. However, exposure to >1 ppm of free chlorine, “hypochlorite” ions, or other strong
oxidizing agents over long periods of time will eventually break down the crosslinking. Temperature
over 30
oC (85
oF) will accelerate the oxidation. This will tend to increase the moisture retention of the
resin, decreasing it s mechanical strength, as well as generating small amounts of extractable breakdown
products. Like all conventional Polystyrene sulfonated resins, it is thermally stable to higher
than 138
oC (280
oF) in the alkali (for instance, sodium) or alkaline earth (calcium and magnesium) salt
forms. The free acid form tends to hydrolyze in water temperatures appreciably higher than 120
oC
(250
oF) thereby losing capacity, as the functional groups are gradually replaced by hydroxyl groups.
