Method for producing fertilizer grade DAP having an increased nitrogen concentration in a spray column
AssigneeIMC-Agrico Company
InventorKenneth J. Jardine
Life of this patent
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Abstract
A process of forming a mixture of diammonium phosphate and triammonium phosphate by the reaction of phosphoric acid with gaseous ammonia in a spray column. In the process, the reaction occurs under pressure. With the appropriate selection of the ammonia pressure and the phosphoric acid feed rate sprayed into the spray column, the amount of each of the diammonium phosphate and triammonium phosphate formed can be controlled.
Claims15
A process comprising spraying orthophosphoric acid into an atmosphere of only pressurized gaseous ammonia with a mixture of solid diammonium phosphate and triammonium phosphate forming such that N/P ratio of the mixture is greater than 2.0.
A process comprising spraying orthophosphoric acid having a concentration of less than 44 weight percent P2O5, into a column from which as much air as possible has been evacuated and containing pressurized, gaseous ammonia with a mixture of solid diammonium phosphate and solid triammonium phosphate forming such that N/P ratio of the mixture is greater than 2.0.
Dependencies are inferred from the claim text.