C-8L
Prominent Systems' C-8L (Na form) 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' C-8L (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)
larger than 30
45–50%
5% max.
1.9 meq/ml
0–14 |
CHEMICAL AND THERMAL STABILITY
Prominent Systems' C-8L (Na) resin is insoluble in dilute or moderately concentrated acids, alkalies, and in all
common solvents. However, exposure to significant amounts 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 accelrate 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.
