Process and plant for the production of urea

Details Process and plant for the production of urea Process and plant for the production of urea

1992-01-24

1994-01-04

Raymond, Richard L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

564 63, 564 69, 564 70, 564 71, C07C27304

Patent

active

052761835

ABSTRACT:
Process for the industrial synthesis of urea, in which ammonia (NH3) and carbon dioxide (CO2) are reacted in at least one reaction space SR at high temperature and pressure and the unreacted materials are treated in a recovery section, said synthesis comprising: a) a reaction between highly pure reagents; and b) a reaction between less pure reagents substantially recycled from said recovery section, characterized by the fact that reaction stage A for high Yield majority synthesis (HEPC), between very pure reagents, operating at a higher pressure (Pmax) for example above 300 kg/cm2 abs and preferably at about 400 kg/cm2 abs, is followed by a flash stage F1 operating at pressures lower by at least 40% than said pressure (Pmax) preferably lower than 200 kg/cm2 abs, the gas effluent GF1 from the above-mentioned flash stage F1 being fed to reaction stage B for minority synthesis of less pure reagents operating at a pressure below 200 kg/cm2 abs, while the liquid effluent EL1 from the abovementioned flash stage, together with effluent EB from stage B of minority reaction operating in parallel with majority reaction stage A, feeds a recovery section RE consisting of two decomposition stages D1 and D2 operating in series: the first D1 being at a pressure lower than 100 kg/cm2 abs preferably at 50 kg/cm2 abs; the second D2 operating at a pressure lower than 50 kg/cm2 abs preferably at 20 kg/cm2 abs.

REFERENCES:
patent: 2848493 (1957-08-01), Dewling et al.
patent: 4354040 (1982-10-01), Inoue et al.
patent: 4670588 (1987-06-01), Zardi

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