C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
202/111, 260/548
C07C 273/04 (2006.01) B01J 12/02 (2006.01)
Patent
CA 1247645
ABSTRACT OF THE DISCLOSURE: An I.D.R. process for the manufacture of urea, comprising a high pressure loop and a subsequent low pressure loop. The (high pressure) loop comprises synthesis reactor wherein NH3 and CO2 are reacted to produce urea. The effluent leaving the reactor is fed into a first isobaric stripper to produce a first solution containing a strong NH3 excess (NH3:CO2 > 6 by moles) and a low CO2 precentage (CO2:urea < 25% b.w.). This first solution is fed into a second isobaric stripper to produce a second solution containing an amount of ammonium carbamate lower than the amount of carbamate contained in the first solution leaving the first stripper. The overproduction of carbamate in the second stripper releases such an amount of heat as to displace a major proportion of the residual NH3 excess contained therein. The second solution leaving the second stripper is flashed at 20-30 ata and enters a first (medium pressure) still forming part of the low pressure loop. This first still is heated by a low pressure recovery steam, coming from an isobaric condensation wherein the vapors leaving the top of the second stripper are condensed. This recovery steam has a thermal level sufficient to decompose at least the overproduction of carbamate. The solution leaving the first still is flashed substantially at 5 ata and enters a second, low pressure still and then a vacuum concentrator. The heat recovered from the vapors leaving the head of the first still is used for operating the second still and vacuum concentrator.
458667
Montedison S.p.a.
Robic Robic & Associes/associates
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