Process and plant for the production of urea with differentiated yield reaction spaces
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United States of America Patent
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Jan 10, 1995
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N/A
app pub date -
Sep 16, 1992
filing date -
Nov 14, 1991
priority date (Note) -
Expired
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Abstract
Process for the industrial synthesis of urea, by reacting ammonia (NH.sub.3) and carbon dioxide (CO.sub.2) in at least one reaction space, at high pressures and temperatures and by recirculating at least part of the non-reacted products obtained in a recovery section, characterized by the fact that the following takes place : a synthesis reaction A) between highly pure reagents, and a synthesis reaction B) between less pure reagents, substantially recycled from the said recovery section, the reaction A) being either of adiabatic type A1) or with partial reaction heat removal A2).
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