METHOD OF PRODUCING GRANULAR AMMONIUM PHOSPHATES Russian patent published in 2009 - IPC C05B7/00 C01B25/28 

FIELD: chemistry.

SUBSTANCE: invention relates to the method of producing granular ammonium phosphates with varying chemical composition, widely used in agriculture as fertiliser. The method of producing granular ammonium phosphates involves neutralising phosphoric acid with ammonia in a gas-liquid stream with subsequent granulating and drying the product. In this method neutralisation is done at varying flow rate of the gas-liquid stream, where acceleration is 1.1 to 2.2 m/s², decceleration - 0.2 to 0.4 m/s², and the ratio of the maximum to the minimum speed varies in the range 2.5 to 4. Use of acid with 42 to 48% P₂O₅ concentration during neutralisation is preferred.

EFFECT: method allows for reducing overshooting of ammonia, stabilising the process and improving operation of absorption equipment.

2 cl, 1 tbl, 2 ex