Patent ID: 6254655
Filing Date: 2001-07-03
Classification: C05C,C05G

Abstract:
A continuous process for producing a granular composite fertilizer composition comprising a nitrogen source in combination with at least one material selected from the group consisting of a phosphorus source, a potassium source, a secondary nutrient source, a micronutrient source and mixtures thereof comprising the steps of:providing a liquid reaction mixture containing no ammonia and consisting essentially of urea and a formaldehyde source;introducing the liquid reaction mixture into a mixing device along with an essentially non-absorbent dry substrate material selected from the group consisting of a phosphorus source, a potassium source, a secondary nutrient source, a micronutrient source and mixtures thereof whereby the liquid reaction mixture is continuously applied onto an outer surface of the essentially non-absorbent dry substrate material;reacting the liquid reaction mixture in situ to form methylene urea reaction products which promote binding of the substrate material into a granular composite while simultaneously granulating the substrate material, under low shear conditions as the liquid reaction mixture reacts to form a granular composite fertilizer composition.