Method for isolating amines from aqueous solutions

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 209/84 (2006.01) C07C 209/82 (2006.01) C07C 209/86 (2006.01) C07C 211/08 (2006.01)

Patent

CA 2465811

The invention relates to a method for isolating amines from aqueous solutions by means of continuous distillation of aqueous solutions of the amines according to a dual-pressure method for the rectification of aqueous solutions of amines forming an azeotrope with water, the composition of said azeotrope being pressure-dependent. The distillation is carried out in two columns under different pressures. According to the inventive method, a) the pressure in the second column is set at least 0.5 bar higher than the pressure in the first column, b) the aqueous amine solution is supplied to the first column in a side stream, and water and parts which boil at a higher temperature than the amines or are non-volatile are exfiltrated out of the bottom of the column, c) a mixture of amine and water is removed at the head of the first column and is guided into the second column in a side stream, d) an azeotrope of water and amine is removed at the head of the second column and is redirected into the first column, and e) the purified amines are extracted at the bottom of the second column.

Procédé permettant d'isoler des amines de solutions aqueuses par distillation continue de solutions aqueuses des amines, selon un procédé à deux pressions pour la rectification des solutions aqueuses d'amines qui forment avec l'eau un azéotrope dont la composition est dépendante de la pression, dans deux colonnes et à des pressions différentes. Selon ledit procédé, (a) la pression dans la seconde colonne est réglée à au moins 0,5 bar de plus que la pression dans la première colonne, (b) la solution aqueuse d'amines est introduite sous forme de courant latéral dans la première colonne, et l'eau et des fractions qui possèdent un point d'ébullition plus élevé que celui des amines ou qui ne sont pas volatiles sont évacuées du fond de la colonne, (c) un mélange d'amines et d'eau est prélevé à la tête de la première colonne et introduit sous forme de courant latéral dans la seconde colonne, (d) un azéotrope d'eau et d'amines est prélevé à la tête de la seconde colonne et renvoyé dans la première colonne et (e) les amines purifiées sont prélevées au fond de la seconde colonne.

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