Integrated two-stage urea synthesis

Details Integrated two-stage urea synthesis Integrated two-stage urea synthesis

1972-07-12

1977-08-16

Helfin, Bernard

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C12600

Patent

active

040426262

ABSTRACT:
Urea synthesis in two stages, in which the first stage of ammonium carbamate formation is in indirect heat exchange with the second stage of ammonium carbamate dehydration to synthesize urea. Excess ammonia is separately preheated by heat exchange with the second stage and added to the main process stream between the first stage and the second stage.

REFERENCES:
patent: 3046307 (1962-07-01), Bochinski
patent: 3607937 (1971-09-01), Otsuka
patent: 3607938 (1971-09-01), Braun

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