Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Patent
1979-03-08
1980-11-25
Hearn, Brian E.
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
C07C12600
Patent
active
042358167
ABSTRACT:
An integrated ammonia-urea process is disclosed which uses as the starting gas mixture a stream coming, for example, from steam reforming of hydrocarbons, carbon dioxide being stripped from the stream by the action of a very concentrated ammonia solution (above 70% by wt) first and the the action of an ammoniated solution of ammonium carbonate secondly, a solution of ammonium carbamate being obtained together with a gas stream composed of nitrogen and hydrogen; sending the carbamate solution to the urea reactor, discharging from the urea reactor the urea solution containing unconverted carbamate and excess ammonia, decomposing said carbamate and sending evolved ammonia to the urea reactor again along with carbon dioxide, discharging the urea solution having now 50% of the original carbamate to an adiabatic stripper in which the stripping gas is essentially composed of hydrogen and nitrogen, removing ammonia and carbon dioxide with water from the adiabatic stripper and condensing ammonia and carbon dioxide by heat exchange, sending the stream of hydrogen and nitrogen to methanization and ammonia synthesis and concentrating the urea solution directly until obtaining a urea melt.
REFERENCES:
patent: 3120563 (1964-02-01), Bongard
patent: 3310376 (1967-03-01), Cook
patent: 3674847 (1972-07-01), Kassenbrood
patent: 3684442 (1972-08-01), Konoki
patent: 4012443 (1977-03-01), Bonetti
patent: 4013718 (1977-03-01), Guadalupi
patent: 4138434 (1979-02-01), Lagana
Lagana Vincenzo
Saviano Francesco
Hearn Brian E.
Snamprogetti S.p.A.
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