Process for urea production
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United States of America Patent
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Sep 23, 1986
Grant Date -
N/A
app pub date -
May 2, 1985
filing date -
May 19, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for the production of urea from ammonia and carbon dioxide via synthesis where the urea formation takes place in a synthesis zone (or zones) in which an excess of free ammonia is kept to favor high conversions, said synthesis zone (or zones) being followed by an ammonia separation and direct recycle to the reaction step, where the urea solution from said reaction zone (or zones) is intimately contacted for a short duration time with a minor portion of the fresh CO.sub.2. The separation step is followed by a CO.sub.2 stripping step where the residual carbamate is removed using a countercurrent fresh CO.sub.2 stream.
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