METHOD OF PRODUCING SUPPLEMENTARY NITROGEN FERTILISER WHEN PRODUCING CARBAMIDE VIA STAMICARBON TECHNIQUE (VERSIONS) Russian patent published in 2013 - IPC C05C1/00 

FIELD: chemistry.

SUBSTANCE: according to the first version of the invention, stage II distillation carbon-ammonia salts (byproduct of carbamide production) are removed from recycling to obtain carbamide, for which pumps are stopped and at pressure of 2 kgf/cm² after the levelling vessel, carbon-ammonia salts are fed into a collecting tank, wherein in order to use carbon-ammonia salts as ready liquid fertiliser or a component of liquid compound fertiliser, the salts are pumped by a pump into railway tanks for shipping, and in order to process carbon-ammonia salts into crystalline powder, the carbon-ammonia salts are first carbonised at pH 7, after which they are fed into a mixer-crystalliser and dried while mixing continuously. According to the second version of the invention, a condensate of juice vapour (carbamide production waste) is mixed with sulphuric acid and phosphoric acid at temperature not lower than 100°C and weight ratio of components of 1:0.152:0.152, respectively, and pH of the solution is brought to 7.

EFFECT: obtaining an additional commercial product in form of nitrogen fertiliser.

4 cl, 2 ex