Process for the revamping of urea synthesis plants consisting of a stripper with ammonia
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United States of America Patent
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Aug 14, 2001
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N/A
app pub date -
Dec 8, 1992
filing date -
Nov 19, 1992
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Expired
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Abstract
Process for the revamping of urea production plants for the synthesis of ammonia (NH3) and carbon dioxide, with a stripping section with NH3, in which the process carries out with differentiated yields, a majority reaction a) between highly pure reagents and a reaction b) between less pure substantially recycled reagents, according to European Patent No. 91116297.2/0479103. According the invention, the urea solution is now fed upstream the stripping section and a reactor with heat removal is utilized. Advantageous, the production capacity of the existing reactor is reduced, with respect to the projected one, in a quantity of 35% to 5%, preferably from 20% to 10%, in favor of the capacity of the 'once-through' reactor.
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