High viscosity potassium metaphosphate

Details High viscosity potassium metaphosphate High viscosity potassium metaphosphate

1987-08-31

1989-04-25

Doll, John

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

C01B 2530

Patent

active

048246492

ABSTRACT:
An improved process for preparing potassium metaphosphate is provided which comprises reacting potassium ions, preferably from the carbonate or bicarbonate, with phosphare ions in an amount sufficient to provide a K/P molar ratio ranging from about 0.85 to about 0.95 substantially in the absence of metal ion other than potassium under heat for a period of time and at a temperature sufficient to convert the potassium and phosphate ions to potassium metaphosphate but insufficient to overconvert. A product of higher viscosity can be obtained by dissolving the potassium metaphosphate in sodium bicarbonate rather than using other sources of sodium ion, particularly when the potassium metaphosphate is prepared with potassium bicarbonate or potassium carbonate.

REFERENCES:
patent: 2557109 (1951-06-01), Iler et al.
patent: 3342738 (1967-09-01), Shen
patent: 3361523 (1968-01-01), Shen
patent: 3378340 (1968-04-01), Martin et al.
patent: 3414375 (1968-12-01), Leroy et al.
patent: 3650684 (1972-03-01), Watson
"Potassium Metaphosphate; Molecular Weight Viscosity Behavior and Rate of Hydrolysis of Non-Cross-Linked Polymer", R. Pfanstiel et al., Journal of American Chemical Society 74, pp. 6059-6064 (1952).

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