C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 251/60 (2006.01) B01J 3/04 (2006.01) B01J 10/00 (2006.01) B01J 19/00 (2006.01)
Patent
CA 2595866
The invention is directed to a process for the preparation of melamine connected through a carbamate concentration unit, comprising a desorption column in which a gas stream, comprising ammonia, carbon dioxide and water is generated, with a process for the preparation of urea, comprising a heat exchanger wherein a urea containing stream is present, wherein the gas stream, comprising ammonia, carbon dioxide and water, is send to the heat exchanger, wherein heat is exchanged with the urea containing stream and the gas stream, comprising ammonia, carbon dioxide and water is cooled and at least partially condensed to obtain an ammonium carbamate solution that is send to the process for the preparation of urea.
L'invention concerne un procédé pour la préparation de mélamine relié via une unité de concentration de carbamate, comprenant une colonne de désorption dans laquelle est généré un flux gazeux comprenant de l'ammoniac, du dioxyde de carbone et de l'eau, à un procédé pour la préparation d'urée, comprenant un échangeur de chaleur dans lequel passe un flux contenant de l'urée, lequel procédé comprenant d'envoyer le flux gazeux, comprenant de l'ammoniac, du dioxyde de carbone et de l'eau, vers l'échangeur de chaleur, dans lequel la chaleur s'échange avec le flux contenant de l'urée et le flux gazeux comprenant de l'ammoniac, du dioxyde de carbone et de l'eau est refroidi et au moins partiellement condensé pour obtenir une solution de carbamate d'ammonium qui est envoyée vers le procédé pour la préparation d'urée.
Dsm Ip Assets B.v.
Smart & Biggar
Stamicarbon B.v.
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