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Abstract

An improved method is disclosed for preparing zinc polyphosphate in a stable, concentrated solution, for water treatment purposes having a pH above 7.0 and in a preferred range of pH between 8.0 and 10.0. Without any acid solubilization required, an approximate 60% solution of tetrapotassium pyrophosphate (TKPP) is formulated and mixed thoroughly in a tank or similar container. Under constant stirring, a predetermined aqueous solution of a normal zinc salt, such as zinc chloride, gradually injected and mixed together into the TKPP solution at a preferred rate of about 5% of the zinc salt solution per minute and in a sufficient amount determined to add about 1 part of zinc to between 5-8 parts of TKPP by weight for maximum corrosion protection. After allowing sufficient time for full reaction of the mixture, the resulting product is a clear, colorless liquid containing zinc polyphosphate and a potassium salt in alkaline solution that may be fed directly into a water distribution system as an effective corrosion protective additive.

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First Claim