METHOD OF PRODUCING GRANULAR AMMONIUM NITRATE Russian patent published in 2011 - IPC C01C1/18 

FIELD: chemistry.

SUBSTANCE: disclosed is a method of producing granular ammonium nitrate which involves neutralisation of nitric acid with gaseous ammonia, evaporation of the obtained solution until obtaining a highly concentrated melt which contains ammonium nitrate in amount of not less than 99.5%, spraying the melt into a granulation tower having at least one vibrogranulator, while feeding air in a counterflow at a rate of 7.0-7.8 t/h per m² of the cross-section of the tower and output of the obtained granules in amount of 1.0-1.2 t/h per m² of the cross-section of the tower, cooling the obtained granules with air in fluidised bed apparatus, where after cooling the granules to temperature not over 45°C, spent air at temperature 60 - 70°C comes out of the fluidised bed apparatus into the bottom part of the granulation tower, where it mixes with air sucked from the atmosphere in volume ratio of 1:1, spent air and juice vapour from the neutralisation and evaporation steps are mixed with spent air from the granulation tower, the vapour-air mixture formed is washed in a gas cleaner, while sprinkling the trays of the gas cleaner with a circulating ammonium nitrate solution and further filtered through a multilayer fibrous non-woven material which contains ultrafine fibre, while sprinkling the front layer of the material with condensate of the juice vapour.

EFFECT: invention enables to intensify the process while improving the quality of the end product and reducing harmful emissions into the atmosphere.

3 cl, 1 dwg, 1 ex