Process for separating and recovering unreacted materials in ure

Details Process for separating and recovering unreacted materials in ure Process for separating and recovering unreacted materials in ure

1976-08-30

1978-03-28

Meros, Edward J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C12602

Patent

active

040814696

ABSTRACT:
Carbon dioxide is reacted with a stoichiometric excess of ammonia at urea synthesis temperatures and pressures in a urea synthesis zone with the mol ratio of ammonia to carbon dioxide being in the range of from 5:1 to 12:1. The urea synthesis effluent from the urea synthesis zone is pressurized to a pressure higher than the urea synthesis pressure, and heated to a temperature higher than the urea synthesis temperature in a separation zone, wherein unreacted ammonium carbamate and excess ammonia contained in said urea synthesis effluent are separated from urea synthesis effluent in the form of a gaseous mixture of ammonia and carbon dioxide. The thus separated gaseous mixture of ammonia and carbon dioxide is recycled to said urea synthesis zone by means of the pressure difference.

REFERENCES:
patent: 2848493 (1958-08-01), Dewling et al.
patent: 3049563 (1962-08-01), Bochinski et al.
patent: 3876696 (1975-04-01), Guadalupi et al.
patent: 3944605 (1976-03-01), Inoue et al.
patent: 3984469 (1976-10-01), Guadalupi et al.

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