C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 273/04 (2006.01) B01J 19/00 (2006.01)
Patent
CA 2123519
PROCESS AND PLANT FOR THE PRODUCTION OF UREA IN REACTION SPACES WITH DIFFERENT YIELDS ABSTRACT In a process of producing urea in which ammonia and carbon dioxide are reacted in a first reaction space (E- 1, R-1) the unreacted carbamate present in the reaction mixture is subjected to a thermal decomposition treatment, so as to obtain ammonia and carbon dioxide which are sent to a second reaction space (R-2) in which they react with a solution of recycled carbamate coming from an urea recovery section (3). Advantageously, the regulation of the temperature and of the ammonia/carbon dioxide molar ratio in the second reaction space (R-2) is carried out by respectively regulating the temperature of the recycled carbamate solution and the temperature of the thermal decomposition treatment of the residual carbamate leaving the first reaction space (E-1, R-1).
Oyen Wiggs Green & Mutala
Urea Casale S.a.
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