Urea revamping

In CO2 stripping plants urea is synthesized at 140 bar and 180-185°C, with molar NH3/CO2 ratio of 2.95-3.0 in the reactor. CO2 conversion is 58-60%. The reactor effluent, containing unconverted ammonia and carbon dioxide in the form of liquid ammonium carbamate, is decomposed using the feed CO2 as the stripping agent. The gaseous ammonia and carbon dioxide are then partially condensed and recycled to the reactor. The heat produced by this condensation is used to generate 3.5 bar steam. The unreacted carbamate from the stripping section is thoroughly decomposed in a decomposition stage operating at 3 bar and is subsequently condensed to form a carbamate solution, which is recycled to the 140 bar synthesis section. Further concentration of the urea solution leaving the 3 bar decomposition stage takes place in the evaporation section.

Revamping scheme to boost capacity and efficiency of CO2 Stripping plants

Key features

  • About 65% less inerts to reactor
  • More efficient carbamate condensation thanks to Full Condenser™ technology

Key features

  • Simple and proven design
  • Submerged condenser with natural circulation
  • Significant production of urea

Revamping scheme for large capacity increase of CO2 Stripping plants

Key features

  • Proven design
  • Suitable for production up to 6000 t/d in combination with Split Flow™ & Full Condenser™ technologies