METHOD FOR PURIFICATION OF NITROGEN FERTILIZERS IN LIQUID PHASE AGAINST PETROLEUM OILS Russian patent published in 1998 - IPC

FIELD: production of liquid mineral fertilizers; purification of fertilizers against undesirable impurities of petroleum oils. SUBSTANCE: method is carried out by extraction of petroleum oils which takes place with the help of organosilicon liquid. Organosiloxane oligomers with linear or branched structure and having density at extraction point by 100 kg/m³ more or less than density of liquid phase of fertilizer are used as said organosilicon liquid. Extraction is carried out by storage of fertilizer, the process takes place in the presence of organosilicon liquid by recirculation of its portion into storehouse, or by cooperative transportation of fertilizer and organosilicon liquid. When transportation tank is discharged it is removed into production cycle together with residue of organosilicon liquid and residue of fertilizer, residual quantity of fertilizer being 1-100 kg per 1 kg of organosilicon liquid. EFFECT: improved efficiency of the method. 4 cl