C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 273/12 (2006.01)
Patent
CA 2606784
The invention relates to a method for concentrating an aqueous ammonium carbamate stream, which has been formed in a process for the preparation of urea, has a pressure between 0.20 MPa and 0.9 MPa, a temperature between 35 ~C and 95 ~C, and contains at least 25 wt.% H2O, comprising: a pressure increase step, in which the aqueous ammonium carbamate stream is increased in pressure to a pressure between 1.0 MPa and 7 MPa; a condensation step, in which the aqueous ammonium carbamate stream is contacted with a gas stream, which has been formed in a process for the preparation of melamine and which consists essentially of NH3, CO2 and optionally H2O and has a lower H2O content than the aqueous ammonium carbamate stream, the gas stream being absorbed in the aqueous ammonium carbamate stream in such a way that a concentrated ammonium carbamate stream is formed that contains between 15 and 35 wt.% H2O; a discharge step, in which the concentrated ammonium carbamate stream is separated and discharged.
La présente invention concerne un procédé de concentration d~un flux aqueux de carbamate d~ammonium formé dans un procédé de préparation d~urée, présentant une pression comprise entre 0,20 MPa et 0,9 MPa, une température comprise entre 35°C et 95°C, et contenant au moins 25 % en poids d~H2O, comprenant : une étape d~augmentation de la pression dans laquelle le flux aqueux de carbamate d~ammonium est augmenté en pression pour atteindre une pression comprise entre 1,0 MPa et 7 MPa ; une étape de condensation dans laquelle le flux aqueux de carbamate d~ammonium est mis en contact avec un flux gazeux, formé dans un procédé de préparation d~un groupe mélamine et qui est essentiellement composé de NH3, CO2 et, en option, H2O, et présente une teneur en H2O inférieure à celle du flux aqueux de carbamate d~ammonium, le flux gazeux étant adsorbé dans le flux aqueux de carbamate d~ammonium de manière à former un flux concentré de carbamate d~ammonium contenant de 15 à 35 % en poids d~H2O ; une étape d~évacuation dans laquelle le flux concentré de carbamate d~ammonium est séparé et évacué.
Mennen Johannes Henricus
Tjioe Tjay Tjien
Dsm Ip Assets B.v.
Smart & Biggar
Stamicarbon B.v.
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