Process for preparing urea

Details Process for preparing urea Process for preparing urea

1973-06-12

1976-02-03

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C12600

Patent

active

039365000

ABSTRACT:
Ammonium carbamate is decomposed and removed in the form of its gaseous components by contacting a urea synthesis solution comprising the carbamate with a stripping gas, such as carbon dioxide, the countercurrent stripping conducted at adiabatic conditions in the stripper unit. Urea synthesis solution to be treated is supplied at higher pressures and temperatures, at least 205.degree.C and at a pressure of at least 225 atm. Conveniently, the decomposition of the ammonium carbamate and the removal of the liberated gases are carried out at these temperatures and pressures so that the stripper is operative under the same conditions as well.

REFERENCES:
patent: 3356723 (1967-12-01), Kaasenbrood
patent: 3544628 (1970-12-01), Hsu

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