This integrated of production of ammonia and of -urea, for the production of -urea

摘要

P integrated process of production of ammonia and of urea for the production of urea. / p & & p & an improvement of the method of manufacture of the urea snam integrated to the separation of the ammonia is characterized by the fact that a gaseous flux obtained by decomposition of the hydrocarbons is sent to an adiabatic separator 15 of ammonia is placed downstream of an apparatus 16 of the decomposition of the carbamate, the adiabatic separator 15 which also receives a solution of urea, which is rich in ammonia originating from the apparatus 16 of the decomposition of the carbamate. The gas stream thus enriched (nh3, co 2, h2 o) is treated in a shock absorber 17 to co2 (or in the reactor to the carbamate) and the process takes place in the reactor 18 of the synthesis of the urea. The loops of recycling and of recovery are mounted between the various units of the reaction and / or decomposition. / p & & p & this method makes it possible to manufacture the urea in a more economic. / p