C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 273/04 (2006.01) B01J 10/00 (2006.01)
Patent
CA 2484105
A process for urea production comprises the steps of: - performing a reaction between ammonia and carbon dioxide in a reaction space to obtain a reaction mixture comprising urea, carbamate and free ammonia in aqueous solution, - subjecting said mixture to a stripping treatment with carbon dioxide feed as a stripping agent to obtain a first flow comprising ammonia and carbon dioxide in vapor phase and a flow comprising urea and residual carbamate in aqueous solution, - feeding said flow comprising urea and residual carbamate in aqueoue solution to a urea recovery section, - separating in said recovery section said residual carbamate from the urea to obtain a first flow of carbamate in aqueous solution.
La pr~sente invention concerne un proc~d~ pour produire de l'ur~e, comprenant les ~tapes suivantes: mise en oeuvre d'une r~action entre de l'ammoniac et du dioxyde de carbone dans un espace r~actionnel pour obtenir un m~lange r~actionnel comprenant de l'ur~e, du carbamate et de l'ammoniac libre en solution aqueuse; exposition dudit m~lange ~ un traitement d'extraction avec apport de dioxyde de carbone en tant qu'agent d'extraction, pour obtenir un premier flux comprenant de l'ammoniac et du dioxyde de carbone en phase vapeur et un flux comprenant de l'ur~e et du carbamate r~siduel en solution aqueuse; introduction dudit flux comprenant de l'ur~e et du carbamate r~siduel en solution aqueuse dans une section de r~cup~ration d'ur~e; s~paration dans ladite section de r~cup~ration entre ledit carbamate r~siduel et l'ur~e pour obtenir un premier flux de carbamate en solution aqueuse.
Oyen Wiggs Green & Mutala Llp
Urea Casale S.a.
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