Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1974-01-28
1976-03-16
Thomas, Jr., James O.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
C07C12600
Patent
active
039446050
ABSTRACT:
Unreacted ammonium carbamate contained in urea synthesis effluent obtained by reacting ammonia and carbon dioxide at urea synthesis pressures and temperatures is recovered by a method comprising subjecting the urea synthesis effluent to a three-stage decomposition to decompose the unreacted ammonium carbamate in each stage, the first stage and the second stage of which are operated at a gauge pressure of at least 30 kg/cm.sup.2 and a gauge pressure of from 10 to 25 kg/cm.sup.2, respectively, absorbing the off-gas resulting from the second stage decomposition in an absorbent to form an aqueous solution of ammonium carbamate and unabsorbed gaseous ammonia, condensing the gaseous ammonia to form recovered liquid ammonia, and absorbing substantially all of the off-gas resulting from the first stage decomposition in the aqueous solution of ammonium carbamate to form recovered ammonium carbamate solution while removing the heat of absorption by indirect heat exchange with the recovered liquid ammonia pressurized to the urea synthesis pressure.
REFERENCES:
patent: 3544628 (1970-12-01), Hsu
patent: 3573173 (1971-03-01), Otsuka et al.
Inoue Shigeru
Kimura Tetsuo
Mitsui Toatsu Chemicals Inc.
Siegel A.
Thomas, Jr. James O.
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