METHOD FOR OBTAINING PHOSPHO-NITROGENOUS PRODUCTS

摘要

PCT No. PCT/FR91/00965 Sec. 371 Date Sep. 15, 1993 Sec. 102(e) Date Sep. 15, 1993 PCT Filed Dec. 4, 1991 PCT Pub. No. WO92/10443 PCT Pub. Date Jun. 25, 1992.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.