Zero discharge process for preparing potassium tripolyphosphate

Details Zero discharge process for preparing potassium tripolyphosphate Zero discharge process for preparing potassium tripolyphosphate

1989-07-31

1990-06-19

Stoll, Robert L.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

210670, 210681, 423181, C01B 2541

Patent

active

049352130

ABSTRACT:
Disclosed is a method of making potassium tripolyphosphate by loading an ion exchange resin with either potassium or hydrogen ions and passing an aqueous solution of sodium tripolyphosphate through the resin so that the sodium ions of the sodium tripolyphosphate are exchanged with the ions loaded onto the resin, forming either potassium tripolyphosphate or tripolyphosphoric acid, respectively. The tripolyphosphoric acid is reacted with potassium hydroxide to form potassium tripolyphosphate. When the ion exchange resin becomes exhausted it is regenerated using a potassium-containing ionic solution, forming a sodium ion containing stream. The sodium ion containing stream is reacted with a phosphoric acid to form a stream of sodium phosphates.

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patent: 2395825 (1946-03-01), Hesler
patent: 2669713 (1954-02-01), Osmun
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patent: 4693828 (1987-09-01), Yoshioka et al.
Kirk-Othmer, Encyclopedia of Chemical Technology, Third Edition, vol. 17 (1982), John Wiley & Sons, pp. 460-466.
Article by James I. Watters et al., Titled "The Acidity of Triphosphoric Acid" in J. Am. Chem. Soc. 78, 4855-4858 (1956).
Article by J. R. Van Wazer et al., Titled "Structure of Properties of the Condensed Phosphates, VII, Hydrolitic Degradation of Pyro- and Tri-Polyphosphate," J. Am. Chem. Soc. 77, 287-291 (1955).

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