Method for the combined production of ammonia and urea

Details Method for the combined production of ammonia and urea Method for the combined production of ammonia and urea

C - Chemistry, Metallurgy

07

C

260/547.9

C07C 273/10 (2006.01)

Patent

CA 1238651

ABSTRACT OF THE DISCLOSURE A description is given of a method for the combined production of ammonia and urea. An ammonia-synthesis gas, consisting mainly of hydrogen, nitrogen and carbon-dioxide, is subjected to pressurized washing, at temperatures equal to ambient temperature at the most, for the removal of acid contaminants, more particularly carbon-dioxide, with a physically acting solvent. The charged solvent is partly expanded for gassing out co-absorbed inerts, is then regener- ated without pressure, is returned to the pressurized wash, and the carbon-dioxide released during regeneration is used to synthesize urea. In order to be able to release this carbon-dioxide, in an energy-saving manner and pre-compressed to the urea installation, it is proposed that the pressure over the charged solvent be brought, after partial relief, to an intermediate value, that the charged solvent be heated for partial gassing out of carbon-dioxide, that the solvent thus partly regenerated be subjected to the final pressureless regenerating stage, and that the carbon-dioxide gassed out during heating be cooled and be released at the intermediate pressure.

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