CONTINUOUS METHOD OF PRODUCING NEUTRAL GRANULATED PHOSPHORUS-POTASSIUM (P/K) FERTILISERS Russian patent published in 2017 - IPC C01B25/163 C05D1/00 C01B25/26 C05B13/06 B01D9/00 

FIELD: chemistry.

SUBSTANCE: fertiliser consists of potassium phosphate with the formula K₃H₃(PO₄)₂ and water in an amount of 10 wt % or less. The production process comprises: i) a step of producing a concentrated aqueous solution of phosphoric acid (PA) and a concentrated aqueous solution of potassium hydroxide (KOH), ii) a step of combining the said concentrated solutions produced in step i) in a reactor providing a reaction temperature in the range of 85 to 120°C, where PA and KOH are used in a weight ratio of 1.14 to 1.22, to produce a liquid reaction mixture, iii) a step of drying the said reaction mixture produced in step ii) in a vacuum drying apparatus, whereby a solid material is produced, wherein the said drying step comprises draining the said reaction mixture produced in step ii) to the said dried material, and iv) cooling the said solid material produced in step iii).

EFFECT: producing a solid bulk fertiliser having a neutral pH without a tendency to caking.

13 cl, 2 ex