Process for the Production of Urea-Comprising Particles

• US 20090084149A1
• Filed: 04/03/2006
• Published: 04/02/2009
• Est. Priority Date: 04/18/2005
• Status: Active Grant

• Current Assignee: Stamicarbon B.V. (Maire Tecnimont SpA)
• Original Assignee: Stamicarbon B.V. (Maire Tecnimont SpA)
• Inventors: Van Der Werf, Jan Wiebe, Brouwer, Marc Jozeph
• Granted Patent: US 7,700,012 B2
• Time in Patent Office: Days
• US Class Current: 71/28
• CPC Class Codes: B01J 2/26 on endless conveyor belts
• CPC Class Codes: C05C 9/005 Post-treatment
• CPC Class Codes: C05G 5/12 Granules or flakes

Abstract

Process for the production of urea-comprising particles, wherein the urea-comprising particles are produced in a pelletizer, comprising a feeding device, a belt and a device to remove the formed pellets from the belt, by feeding a urea-comprising liquid to the feeding device from which droplets of the urea-comprising liquid are dosed to the belt, whereon the urea-comprising droplets solidify and cool to a temperature of ≦55° C., whereafter the formed urea-comprising particles are removed from the belt.

Claims

1. Process for the production of urea-comprising particles, characterized in that the urea-comprising particles are produced in a pelletizer, comprising a feeding device, a belt and a device to remove the formed pellets from the belt, by feeding a urea-comprising liquid to the feeding device from which droplets of the urea-comprising liquid are dosed to the belt, whereon the urea-comprising droplets solidify and cool to a temperature of ≦

55°

C., whereafter the formed urea-comprising particles are removed from the belt.

2. Process according to claim 1, characterized in that the urea-comprising liquid is a urea melt.

3. Process according to claim 2, characterized in that the urea melt comprises ≧

99 wt. % urea.

4. Process according to claim 1, characterized in that the belt is cleaned after removing the urea-comprising particles from the belt.

5. Process according to claim 1, characterized in that the urea-comprising liquid contains an additive.

6. Process according to claim 5, characterized in that the additive is a formaldehyde solution or a reaction product of urea and formaldehyde.

7. Process according to claim 1, characterized in that the urea-comprising liquid is a mixture of urea with another fertilizer.

8. Process according to claim 7, characterized in that the urea-comprising liquid is a mixture of urea with ammoniumsulphate.

9. Process according to claim 8, characterized in that the urea-comprising liquid is a mixture of urea with >

30 gew. % ammoniumsulphate.

10. Urea-comprising particle, characterized in that the h/d ratio of the particle is 0.99 to 0.1.

11. Urea-comprising particle according to claim 10, characterized in that the particle comprises an additive.

12. Urea-comprising particle according to claim 11, characterized in that the additive is a formaldehyde solution or a reaction product of urea and formaldehyde.

13. Urea-comprising particle according to claim 10, characterized in that the particle comprises urea and an other fertilizer.

14. Urea-comprising particle according to claim 13, characterized in that the particle comprises urea and ammoniumsulphate.

15. Urea-comprising particle according to claim 14, characterized in that the particle comprises urea and >

30 gew. % ammoniumsulphate.