Process for urea production from ammonia and carbon dioxide

Details Process for urea production from ammonia and carbon dioxide Process for urea production from ammonia and carbon dioxide

C - Chemistry, Metallurgy

07

C

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

Patent

CA 2575537

A process for urea production comprises a first process step in which ammonia (7) and carbon dioxide (6) are obtained, subjecting natural gas (1) to reforming treatments (12, 14), and a second step of urea (8a) production from such ammonia (7) and from carbon dioxide, through a formation of a solution comprising urea and ammonium carbamate in a urea synthesis reactor (20) and a subsequent decomposition of the ammonium carbamate and. urea recovery, the process comprises the steps of: - treating combustion smokes (5) comprising carbon dioxide with an aqueous solution (9a) comprising a part (7b) of such ammonia (7), obtaining an aqueous ammonium carbamate solution (9c) ; - supplying the solution (9c) thus obtained to the second process step.

Cette invention a pour objet un processus de production d~urée comprenant une première étape au cours de laquelle sont obtenus de l~ammoniac (7) et du dioxyde de carbone (6), soumettant ainsi du gaz naturel (1) à des traitements de reformage (12, 14), et une deuxième étape de production d~urée (8a) à partir de cet ammoniac (7) et de ce dioxyde de carbone, par la formation d~une solution contenant de l~urée et du carbamate d~ammonium dans un réacteur de synthèse d~urée (20) et par la décomposition considérable du carbamate d~ammonium et la récupération de l~urée. Ce processus est composé des étapes suivantes : - le traitement des fumées de combustion (5) contenant du dioxyde de carbone à l~aide d~une solution aqueuse (9a) comprenant une partie (7b) de l~ammoniac (7), obtenant ainsi une solution de carbamate d~ammonium aqueuse (9c) ; - la mise à disposition de cette solution (9c) ainsi obtenue pour la deuxième étape du processus.

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