[12] Patent
[11] Patent No.:GC0009375  
[45] Date of Publishing the Grant of the Patent: 31/Dec /2018                56/2018  
Number of the Decision to Grant the Patent:2018/141720
Date of the Decision to Grant the Patent:16/Dec/2018

[21] Application No.:GC 2015-29762

[22] Filing Date:22/7/2015

[72] Inventor: Mennen, Johannes Henricus

[73] Owner: Stamicarbon B.V., Mercator 2, 6135 KW, Sittard, Netherlands

[74] Agent: Abu-Gazaleh Intellectual Property L.L.C




Int. Cl.: B01D 9/00; C07C 273/16, 275/02 (2006.01)

[56] Cited Documents:

-WO 2013055219 A1 (STAMICARBON [NL]) 18 April 2013
-EP 2153880 A1 (UREA CASALE SA [CH]) 17 February 2010
Examiner: Sarah Fahad Al-Dossary

[57] Abstract: Disclosed is a process for the preparation of a urea product suitable for being diluted with water so as to form an aqueous urea comprising solution for use in a unit for the reduction of NOx in combustion engine exhaust gases, also known as Diesel Exhaust Fluid (DEF) or to be used in DeNOx systems of exhaust vapor from industrial furnaces. The process comprises obtaining an aqueous urea solution from or after a recovery section in a urea production process. This solution, which has a low content of impurities, is subjected to flash crystallization at a low pressure, so as to obtain a solid crystallized urea containing product, which is a free-flowing powder containing less than 0.2 wt.% water. This product is packaged under conditions such that the water content in the packaged product is maintained below 0.2 wt.%. The invention can also be used in a method of increasing the capacity of an existing urea plant.
No. of claims: 10     No. of figures: 2


Note: Any interested individual may, within 3 months of publication of the grant, file objection thereof with the Grievance Committee after payment of grievance fees.