US 11,666,883 B2
Plant for the synthesis of melamine with offgas recovery in a tied-in urea plant
Andrea Scotto, Breganzona (CH); and Matteo Fumagalli, San Fermo della Battaglia (IT)
Assigned to Casale SA, Lugano (CH)
Appl. No. 16/964,839
Filed by Casale SA, Lugano (CH)
PCT Filed Jan. 14, 2019, PCT No. PCT/EP2019/050746
§ 371(c)(1), (2) Date Jul. 24, 2020,
PCT Pub. No. WO2019/145169, PCT Pub. Date Aug. 1, 2019.
Claims priority of application No. 18153653 (EP), filed on Jan. 26, 2018.
Prior Publication US 2021/0060519 A1, Mar. 4, 2021
Int. Cl. B01J 19/24 (2006.01); B01J 3/03 (2006.01); C07C 273/04 (2006.01); C07D 251/60 (2006.01)
CPC B01J 19/245 (2013.01) [B01J 3/03 (2013.01); C07C 273/04 (2013.01); C07D 251/60 (2013.01); B01J 2219/0004 (2013.01); B01J 2219/00024 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A melamine-urea plant comprising:
a melamine plant (MEL) for the production of melamine starting from urea, obtaining a product stream containing melamine and a stream of offgas containing NH3 and CO2 in gaseous form;
a offgas-fed urea plant (UR) dedicated to the synthesis of urea starting from said stream of offgas, said offgas-fed urea plant being apt to produce urea starting from ammonia and CO2, and comprising at least a high-pressure synthesis section running at a synthesis pressure and a recovery section running at a recovery pressure lower than said synthesis pressure,
wherein said stream of offgas provides at least 90% of ammonia and CO2 supply of said offgas-fed urea plant.