Process and plant for urea production with reaction spaces having differentiated yields
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United States of America Patent
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Sep 11, 2001
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N/A
app pub date -
Aug 25, 1997
filing date -
Dec 23, 1994
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Expired
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Abstract
In a process for urea production, substantially pure ammonia and carbon dioxide are reacted in a main reaction space from which outgoes a reaction mixture subjected to stripping to obtain a partially purified mixture sent to a urea recovery section. From this section, a dilute carbamate solution is obtained which is recycled to an auxiliary reaction space in which the residual carbamate is converted into urea. This process achieves high average conversion yield with reduced energy consumption.
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