Process for the production of urea

Details Process for the production of urea Process for the production of urea

1982-04-12

1985-02-19

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

564 68, 564 70, C07C12602

Patent

active

045007349

ABSTRACT:
A process for the production of urea starting from ammonia and carbon dioxide in a NH.sub.3 /CO.sub.2 molar ratio of from 5/1 to 8/1, comprising the synthesis and decomposition of the ammonium carbamate contained in the solution of urea, in two steps; the first of these provides for ammonia as the stripping agent and the second for carbon dioxide as the stripping agent.
In the process of the invention the synthesis and the decomposition in the first decomposition step are carried out at an equal or substantially equal pressure comprised between 180 and 250 atm., while the decomposition in the second step is carried out at a pressure of from 30 to 50 atm. lower than the pressure in the first step.

REFERENCES:
patent: 3470247 (1969-09-01), Guadalupi
patent: 3471558 (1969-10-01), Wentworth et al.
patent: 3514484 (1970-05-01), Wentworth
patent: 3607938 (1971-09-01), Braun

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