METHOD OF PRODUCING GRANULAR SLOW-ACTING FERTILISER Russian patent published in 2014 - IPC C05C1/02 

FIELD: chemistry.

SUBSTANCE: invention relates to agriculture. The method of producing granular slow-acting fertiliser involves dispersing droplets of molten fertiliser into a vapour(gas)-droplet ascending stream of a liquid coolant in a column apparatus, fed in an amount required to cool the granules from temperature which is 20°C above the boiling point of the coolant to the softening point of the polymer compound, crystallising, cooling and separating the formed granules from the coolant, condensation thereof and returning to the process to coat the surface of the granules with a waterproof polymer coating, which provides a controlled rate of dissolving the initial fertiliser, by dissolving a polymer compound in an organic solvent, wherein in order to reduce consumption of the organic solvent and increase water-stability of the granules, the liquid coolant, which is simultaneously an encapsulating agent, is a stable aqueous emulsion consisting of a polymer solution in an organic solvent and water, with the oil to water phase ratio of 1:5-1:0.1.

EFFECT: invention reduces consumption of organic solvent and increases water stability of the granules.

3 tbl, 5 ex