Use
WS 8450
is a synergistic
blend of anionic polymeric sequestrants, dispersants and organic
sequestring agents of phosphonate type.
It is recommended for deposit inhibition in industrial water systems
like recirculating cooling systems, cooling towers, waste water streams
facing deposition problems etc.
Almost mineral scales can be inhibited by WS 8450 like Calcium
Carbonate, Fe and Mn based scales, CaF
2
etc.
Features
WS 8450
is a very
concentrated, synergistic blend resulting in low dose rates and normal
use cost.
WS 8450 is suitable for use in waters containing high solids
amounts, like scrubbers and paper mill applications.
Technology
Polymer
One proposed mechanism for the excellent control of
calcium carbonate by WS 8450 is the highly polar nature of the
polymer employed.
In comparison to polymers such as polyacrylate which have an
evenly-distributed charge network, the polymer employed in WS 8450 tends
to be more anionic in the region of the carboxylic groups (COOH) and
slightly positive in the region of methyl groups .
This localized or polar charge is more effective in controlling the
small incipient scale crystals of calcium carbonate and calcium sulfate.
In addition, the relatively large non-functional side chains provide
physical distortion of crystalline lattices, minimizing their growth.
Thus, the copolymer employed in WS 8450 can effectively
control two important potential foulants in a cooling water system.
Additionally, the polar nature of the polymer creates a charge
repulsion mechanism similar to a surfactant molecule. This mechanism
gives the product its ability to disperse suspended solids
.
Phosphonates
HEDP and AMP are the primary phosphonates used in cooling water
systems. Before their use as corrosion inhibitors, phosphonates were
recognized as excellent scale control agents and metal oxide
sequestrants.
Whereas phosphate esters are characterized by carbon to oxygen to
phosphorous bonding (COP), the phosphonates have a carbon to phosphorous
to oxygen bonding (CPO). Because CPO bonding is more resistant to
hydrolysis or cleavage than the COP bond, the potential for phosphate
fouling is less with the phosphonates than it is with phosphate esters.
Phosphonates provide excellent control of hydrated ferric oxide
deposits at comparatively low concentrations. They reduce attractive
forces between individual iron particles by adsorption of the
phosphonate at the particle surfaces. They are also excellent for the
control of hardness salts, and are capable of better threshold
inhibition than polyphosphates and phosphate esters.
Phosphonates can also function as chelants or sequestrants for
control of metallic-oxide (1e. Iron, manganese and zinc) deposits. Their
control over such materials is superior even to that of traditional
chelants, although they are somewhat less effective on calcium and
magnesium.
Carboxylated Phosphonates
Carboxylated phosphonates represent a newer class of compounds which
combine the effective carboxylic acid functionality of polymers such as
PMA and polyacrylate with the proven capabilities of other
organophosphorus compounds such as AMP and HEDP.
WS 8450
contains Posphono
Butane Tri Carboxylic Acid (PBTC). As the name
suggests, the structure of this material, which is shown in the below
diagram, is a 3:1 ratio of carboxylic acid to phosphorus.
One of the first uses of PBTC was as a zinc stabilizer in zinc based
corrosion inhibitor programs.
Because it is able to sequester the metal ion, PBTC is used to
prevent precipitation in waters where the pH is controlled above 8.0.
In this manner, PBTC acts to transport calcium to the metal surface
where the localized high pH will cause calcium to precipitate and form
its protective film.
PBTC has also proven to be an effective iron sequesterant agent and
is more resistant to strong oxidizing agents such as chlorine.
As a calcium carbonate antiscalant, PBTC functions well via the
mechanisms of dispersion and scale crystal distortion.
Benefits
 | WS 8430's advanced polymer
composition which is dramatically more effective in preventing calcium
carbonate scale. |
| Does not contain environmentally objectionable Materials so it can
be used where pollution is a major concern. |
| Calcium Carbonate is controlled by modification of the crystal
lattice structure of incipient scale crystals, thus preventing
growth and adherence |
| Extends the pH in which our treatment program can safely operate
making it an excellent adjunct to our WSC
series corrosion inhibitors. |
| Is useful in on line cleaning to remove and disperse calcium
carbonate. |
| Has wide range capability due to its unique formulation. High
temperature, pH, or alkalinity do not degrade the product or its
performance. |
| Disperses mud, silt, and dirt to keep system surfaces free of
fouling deposits. |
Feeding
For most applications a continuous treatment level of 0.5 - 5.0 ppm
of WS 8450 in the make-up water is acceptable. However, optimum
dosage will depend on the nature and severity of fouling and the
operational parameters of the system.
WS 8450
is an mildly acidic material and therefore corrosion
resistant feeding equipment should be used.
Wear suitable protective clothing, goggles and gloves.
WS 8450 is a mild skin irritant and moderate eye irritant. In
case of contact immediately flush
with water for 5 - 15 minutes. After eye contact seek medical advice.
Do no swallow.
Before use review the Material Safety Data Sheet for additional
information
Handling
precautions
