Preparation of zinc polyphosphate in high PH solution

Details Preparation of zinc polyphosphate in high PH solution Preparation of zinc polyphosphate in high PH solution

1992-01-31

1995-01-03

Stoll, Robert L.

Compositions

Preservative agents

Anti-corrosion

422 18, 423306, C23F 11167

Patent

active

053784014

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.

REFERENCES:
patent: 4089651 (1978-05-01), Scott
patent: 4692315 (1987-09-01), Greaves et al.

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