Process for the preparation of urea

Details Process for the preparation of urea Process for the preparation of urea

1974-06-24

1977-01-18

Vertiz, Oscar R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C12600

Patent

active

040039285

ABSTRACT:
A process is described for the preparation of urea at a high temperature and pressure whereby the quantity of water recycled to the urea-synthesis reactor along with the recycle ammonium carbamate may be reduced. The high pressure aqueous urea solution from the reactor is expanded into two or more ammonium carbamate decomposition stages operating at successively lower pressures. In at least one of the ammonium carbamate decomposition stages the expanded aqueous urea solution is heated in a controlled manner and a first off-gas is separated. The residual aqueous urea solution is again heated and a second off-gas is removed, which off-gas is combined with the first off-gas, condensed and recycled to the urea-synthesis reactor.

REFERENCES:
patent: 3053891 (1962-09-01), Cook et al.
patent: 3172911 (1965-03-01), Mavrovic
patent: 3527799 (1970-09-01), Mavrovic
patent: 3759992 (1973-09-01), Mavrovic
patent: 3808271 (1974-04-01), Mavrovic
patent: 3816528 (1974-06-01), Cook

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