Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1980-08-11
1981-06-30
Vertiz, O. R.
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
252135, 252173, 252DIG14, 423307, 423315, C01B 2540
Patent
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).
Erco Industries Limited
Langel Wayne A.
Vertiz O. R.
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