Process for the preparation of urea
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United States of America Patent
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May 4, 2004
Issued Date -
N/A
app pub date -
Jun 2, 2000
filing date -
Dec 5, 1997
priority date (Note) -
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Abstract
The invention relates to a process for the preparation of urea from ammonia and carbon dioxide in which the low-pressure carbamate stream formed in the further upgrading of the urea synthesis solution is stripped in a CO.sub.2 -carbamate stripper in countercurrent contact with CO.sub.2, which results in the formation of a gas mixture consisting substantially of ammonia and carbon dioxide. This gas mixture is preferably subsequently condensed in a high-pressure carbamate condenser and then returned to the synthesis zone.
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