Process for the production of phospho-nitrogenous products and products thus obtained
AssigneesTransvalor, Grande-Paroisse S.A.
InventorsPatrick Achard, Pierre Ilbizian, Laurent Limousin, Bernard Neveu, Jean-Bernard Peudpiece, Yvan A. Schwob
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Abstract
The method relates to the production of phospho-nitrogenous products soluble in neutral ammonium citrate and wherein free urea does not remain in significant amount in such products. Most of the free urea is involved in a ureic combination of calcium sulphate. Tricalcic phosphate is reacted with a reactant obtained by mixing sulfuric acid and urea. The process is particularly useful for the manufacture of fertilizers.
Claims9
Process for the production of phospho-nitrogenous products whose P.sub.2 O.sub.5 is substantially entirely soluble in neutral ammonium citrate and in which no free urea remains in a significant quantity, this latter being for the most part combined with calcium sulfate ureate, which comprises reacting calcium phosphate with a liquid mixture reagent comprising between 3 and 4 moles of urea per mole of sulfuric acid so as to obtain a reaction product containing mono and/or bicalcium phosphates and urea substantially bound as the tetra-ureate of calcium sulfate.
Dependencies are inferred from the claim text.