OBTAINING AMMONIUM PHOSPHATES Russian patent published in 2014 - IPC C01B25/28 C01B25/46 B01D11/04 C05B11/08 C05B7/00 C05C3/00 

FIELD: chemistry.

SUBSTANCE: invention relates to obtaining ammonium phosphates from phosphorus-containing solutions. Method of obtaining includes the following stages: supply of enriched with phosphorus liquid phase, which does not mix with water (210); addition of water-free ammonia into liquid phase enriched with phosphorus (212); precipitation of monoammonium phosphate and/or diammonium phosphate from said liquid phase (214); regulation of liquid phase temperature in the course of said stages of addition and precipitation in preliminarily specified interval of temperatures (216); removal of precipitated monoammonium phosphate and/or diammonium phosphate from said liquid phase (218); washing crystals of removed precipitated monoammonium phosphates and/or diammonium phosphates (220) and drying washed crystals (228). Method also includes stages: separation of residual liquid phase, washed from said crystals (222); re-use of said separated residual liquid phase for further absorption of phosphorus to be reused in the following removal (230), and re-use of used washing liquid (226), poor in said residual liquid phase for the following washing of said crystals. Stage of washing (220) includes washing with saturated water solution of ammonium phosphate, and the stage of separation of residual liquid phase (222) includes phase separation of said liquid phase and said saturated water solution of ammonium phosphate. Invention also relates to installation for obtaining ammonium phosphates.

EFFECT: completely soluble ammonium phosphates without necessity to concentrate phosphoric acid by water evaporation.

20 cl, 5 dwg, 2 tbl, 10 ex