Urea synthesis process and apparatus

Details Urea synthesis process and apparatus Urea synthesis process and apparatus

2006-05-30

2006-05-30

Caldarola, Glenn (Department: 1764)

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Including heat exchanger for reaction chamber or reactants...

C564S067000, C564S068000, C564S070000, C564S071000, C564S072000

Reexamination Certificate

active

07052655

ABSTRACT:
Urea is prepared by reacting ammonia and carbon dioxide in an apparatus comprising a vertical condensation and synthesis column and a stripper, to provide a urea synthesis solution comprising urea, unreacted ammonia, unreacted carbon dioxide and water. The urea synthesis solution is transferred from the top of the vertical condensation and synthesis column to the top of a stripper. Carbon dioxide is introduced into the bottom of the stripper and contacted with the urea synthesis solution, thereby separating the unreacted ammonia and the unreacted carbon dioxide from the urea, and providing a mixed gas comprising ammonia, carbon dioxide and water. The mixed gas is transferred into the bottom of the vertical condensation and synthesis column, where it is reacted with liquid ammonia injected into the bottom and a middle of the vertical condensation and synthesis column. The mixed gas and liquid ammonia are condensed and react to form urea. Uncondensed gases are absorbed in an absorbing medium, which is subsequently recycled to the bottom of the vertical condensation and synthesis column.

REFERENCES:
patent: 4420635 (1983-12-01), Washington et al.
patent: 5936122 (1999-08-01), Kjima et al.
patent: 0 834 501 (1998-04-01), None
patent: 1 035 112 (2000-09-01), None

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