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PRODUCT INFORMATION

P.A.S

INTROLDUCTION P.A.S coats the micro-crystalline nuclei, and
inhibits their growth, preventing the formation of
In sugar industry, during production season, deposite
of inorganic scale in the evaporators cause large particle in solution at concentration above
inefficiency in heat transfer in evaporation. It is with the normal precipitation level.
high potential that scale found in the first body is 3. Prevent adherence onto metal surface.
phosphate and carbonate salt and that found in the
last body is sulfate and silicate. Calcium sulfate and
calcium silicate give hard, dense and impermeable USE OF P.A.S

scale. These cannot easily be removed in cleaning The vacuum from evaporator is used to suck P.A.S
process. This “threshold effect” is the prevention of diluted solution into the feed line at appropriate rate.
precipitation from supersaturated solutions of The flow rate is adjusted by control valve.
scalants by ppm. levels of inhibitor. However, one of
the problems encountered with the polyphosphates
is their instability with often leads to orthophosphate DOSAGE
scale resulting from decomposition.
Feed 2-3 ppm. based on clarifier juice to the last
effect evaporator.
Feed 2-3 ppm. based on clarifier juice to the second
DESCRIPTION last effect evaporator.

P.A.S used at high concentrations, in some
instances, can sequester potential scale–forming
cations. At lower concentrations these same PRECAUTION

materials will allow precipitation but will prevent P.A.S is non toxic to skin and eye. However, avoid
adherence by functioning as a dispersant and by contact with eye is recommended and in case of
altering the size of nuclei. P.A.S is specially selected contact, flush eye thoroughly with water.
blend of surfactant, dispersant, sequestrant and
chelaling agent for inhibiting especially sulphate and
silicate scale in the last body evaporators. Its PACKAGING
inhibiting property is still effective at temperature up
to 250 °F and at all pressure. It is soluble at all P.A.S is packed in lined steel drum of 200 Kgs. net.
proportion to water, non foaming and particularly
resistant to hydrolysis.

ADVANTAGES

1. Prolong the operation period before cleaning.
2. Improve heat transfer.
3. Minimize scale formation.
4. Scale is soft and easily removed.
5. Reduce cleaning time.
6. Economical treatment cost.

FUNCTION OF P.A.S

1. Form strong substitution iner chelate bond with
calcium ions present at kinks and dislocations on
the crystal surface which make it superior calcium
sulphate and calcium silicate scale inhibitors.
2. Exhibit the threshold effect. This occurs when

TECHNICAL SERVICE
WELLMAN CO.,LTD HAS A STAFF OF TECHNICAL SERVICE
ENGINEERS WHO WILL ASSIST AND TRAIN YOUR MEN ON THE PROPER
EVALUATION AND APPLICATION OF OUR CHEMICALS AND GIVE
RECOMMENDATION TO ENSURE SMOOTH OPERATION
THIS SERVICE IS GIVE FREE OF CHARGE