Production of sodium polyphosphates

Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing

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252135, 252173, 252DIG14, 423307, 423315, C01B 2540

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active

042762731

ABSTRACT:
Stable aqueous solutions of sodium polyphosphate useful in granulating dry solid cleaning composition components are formed by direct reaction of polyphosphoric acid with sodium carbonate generally at a temperature of about 50.degree. C. The reactants are used in an Na:P ratio of 1.2:1 to 1.5:1, and the product solution contains about 32 to about 37% w/w P.sub.2 O.sub.5 of which a high proportion is present as polyphosphate and has a pH of about 5 to about 6.5.

REFERENCES:
patent: 3361523 (1968-01-01), Yu Shen
patent: 3367883 (1968-02-01), Stahlheber
patent: 3645674 (1972-02-01), Heymer et al.
patent: 4207197 (1980-06-01), Davis et al.
patent: 4228025 (1980-10-01), Jacobsen
patent: 4228043 (1980-10-01), Van den Brom
patent: 4233172 (1980-11-01), McLaughlin et al.
"STPP for Modern Detergents," paper presented at 7th annual meeting, Canadian Manufacturers of Chemical Specialties Association, Montreal, Canada (Oct. 27, 1964).

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