Process for the preparation of urea
AssigneeDsm IP Assets B.V.
InventorJohannes Henricus Mennen
Life of this patent
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Abstract
The invention relates to a process for the preparation of urea from ammonia and carbon dioxide in a urea plant that contains a high-pressure synthesis section and one or more recovery section(s) at a lower pressure, the high-pressure synthesis section comprising a reactor, a stripper and a condenser, with gases leaving the high-pressure synthesis section being condensed in a medium-pressure condenser at 0.5-12 MPa to which also a carbamate stream from one of the recovery sections is supplied, after which at least a part of the formed condensate is supplied to the high-pressure condenser.
Claims16
Process for the preparation of urea from ammonia and carbon dioxide in a urea plant that contains a high-pressure synthesis section and one or more recovery section(s) at a lower pressure, the high-pressure synthesis section comprising a reactor, a stripper and a condenser, characterized in that gases leaving the high-pressure synthesis section are condensed in a medium- pressure condenser at 0.5 -12 MPa to which also a carbamate stream from one of the recovery sections is supplied, after which at least a part of the formed condensate is supplied to the high-pressure condenser.
Urea plant containing a high-pressure synthesis section and one or more recovery section(s), the high-pressure synthesis section comprising a reactor, a stripper and a condenser, characterized in that the urea plant contains a medium-pressure condenser, which is connected to a gas outlet of the high-pressure synthesis section.
Process for optimization of a urea plant that contains a high-pressure synthesis section and one or more recovery section(s), the high-pressure synthesis section comprising a reactor, a stripper, a condenser and optionally a scrubber, characterized in that a medium-pressure condenser is added to the urea plant in which gases coming from the high-pressure synthesis section are condensed, and the capacity of the high-pressure stripper is increased.
Dependencies are inferred from the claim text.