Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1977-07-18
1979-09-04
Vertiz, O. R.
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
423309, 71 43, C01B 1516, C01B 2526
Patent
active
041668391
ABSTRACT:
Animal feed grade phosphates such as mono-calcium phosphate, di-calcium phosphate or mixtures thereof are produced by direct reaction between phosphoric acid and Ca-containing materials. A finely ground, preheated calcium carbonate suspension is brought to react with a suitable quantity of preheated phosphoric acid by introducing the reactants into a short, tubular reaction zone, open at one end, whereby development of gas and intensive mixing of the reactants in the reaction zone take place. The gas formed by the reaction expels or ejects the foaming reaction mixture from the tube-like reaction zone, the reaction being substantially completed while the individual particles of the mixture are freely suspended in air or gas, whereafter the reacted mixture is collected in the form of a free-flowing granulate having improved handling properties, without any further quenching treatment of the granules. An apparatus for carrying out the process includes a reaction chamber connected with separate feed lines for calcium carbonate suspension and phosphoric acid, respectively, and means for collecting and further processing the resultant reaction product. The reaction chamber has the form of a tube reactor having an open end portion which forms a discharge which is arranged for cooperation with a suspension chamber and a collecting device arranged at the lower end of the chamber.
REFERENCES:
patent: 2108940 (1938-02-01), MacIntire
patent: 2121208 (1938-06-01), Milligan
patent: 2977190 (1961-03-01), Yates et al.
patent: 3409394 (1968-11-01), Sprigg
patent: 3464808 (1969-08-01), Kearns
Isaksen Jan B.
Skauli Oyvind
Heller G. A.
Norsk Hydro a.s
Vertiz O. R.
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