Process for the preparation of urea

Details Process for the preparation of urea Process for the preparation of urea

2005-06-06

2009-11-24

O'Sullivan, Peter G (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

C564S070000, C564S071000, C564S072000

Reexamination Certificate

active

07622609

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.

REFERENCES:
patent: 8 900 152 (1990-08-01), None
patent: WO 02/090323 (2002-11-01), None
patent: WO 03/087043 (2003-10-01), None
International Search Report mailed Jul. 28, 2005 in PCT/NL2005/000408.
Written Opinion mailed Jul. 28, 2005 in PCT/NL2005/000408.

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