Process for the preparation of urea

Details Process for the preparation of urea Process for the preparation of urea

C - Chemistry, Metallurgy

07

C

C07C 273/04 (2006.01)

Patent

CA 2473224

Process for the preparation of urea from carbon dioxide and ammonia by means of a urea stripping process, comprising a high-pressure stripper and a high- pressure condenser, whereby a urea synthesis solution is formed, and wherein the stream condensate that forms during high-pressure stripping of the urea synthesis solution is utilized for medium-pressure decomposition of the ammonium carbamate in the urea synthesis solution, characterized in that a combination of the steam condensate and steam A, which forms in the high- pressure condenser, is used for medium-pressure decomposition, with the high- pressure condenser being a submerged condenser. The invention also relates to a process for improving a urea plant comprising a thermal stripping process.

L'invention concerne un procédé de préparation d'urée à partir de dioxyde de carbone et d'ammoniac, au moyen d'un procédé de lavage d'urée, ce procédé mettant en oeuvre un dispositif de lavage haute pression et un condensateur haute pression. Une solution de synthèse d'urée est formée, et le condensé de vapeur qui se forme durant le lavage haute pression de la solution de synthèse d'urée est utilisé pour la décomposition à pression moyenne du carbamate d'ammonium dans la solution de synthèse d'urée. Ce procédé se caractérise en ce que la combinaison du condensé de vapeur et de la vapeur A, qui se forme dans le condensateur haute pression, est utilisée pour la décomposition à pression moyenne, le condensateur à haute pression étant un condensateur immergé. L'invention concerne également un procédé permettant d'améliorer une installation de production d'urée comprenant un procédé de lavage thermique.

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