Process for urea production
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United States of America Patent
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Nov 21, 2000
Grant Date -
N/A
app pub date -
Mar 16, 1995
filing date -
May 8, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved process for urea production as well as a method of retrofitting a pre-existing urea plant based on the Stamicarbon process are disclosed. According to the invention, a high yield reaction space fed by highly pure reagents (NH3 and CO2) and a separating section of the solution leaving the high yield reaction space are added to the pre-existing urea plant, means being provided for recirculating ammonia and carbammate solutions obtained in the separating section to the added high yield reaction space and to the pre-existing reactor respectively.
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