Process for the integrated preparation of ammonia and urea

Details Process for the integrated preparation of ammonia and urea Process for the integrated preparation of ammonia and urea

C - Chemistry, Metallurgy

07

C

C07C 273/10 (2006.01) C01B 3/02 (2006.01) C01B 3/52 (2006.01) C01C 1/04 (2006.01)

Patent

CA 2357256

Process for the combined preparation of urea and ammonia reactant by steps of providing ammonia synthesis gas con- taining carbon dioxide and conversion of the synthesis gas to the ammonia reactant, reacting the ammonia reactant with the carbon dioxide in the synthesis gas to ammonium carba- mate and to urea product, which process comprises further steps of prior to the conversion of the synthesis gas to the ammonia reactant, (i) washing the synthesis gas with an aqueous solu- tion of the ammonia reactant and forming a solution being rich in ammonium carbamate; (ii) removing excess of ammonia reactant from the washed synthesis gas by washing with water and withdrawing an aqueous solution of ammonia reactant; (iii) purifying the water washed synthesis gas by re- moving reminding amounts of water and ammonia; and (iv) passing the purified synthesis gas to the conver- sion of the gas to ammonia reactant.

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