Process for the continuously operated purification by...

Details Process for the continuously operated purification by... Process for the continuously operated purification by...

C - Chemistry, Metallurgy

07

C

C07C 7/04 (2006.01) B01D 3/14 (2006.01) C07D 301/12 (2006.01) B01D 3/42 (2006.01)

Patent

CA 2493271

The invention relates to a method for the continuous purification by distillation of methanol, used as a solvent in the synthesis of propylene oxide by the reaction of a hydroperoxide with propylene and the simultaneous isolation of the methoxy propanols. Said method is characterised in that the solvent mixture that accumulates during the synthesis is separated in a dividing wall column into a low-boiler fraction containing methanol, a medium- boiler fraction containing the methoxy propanols as an azeotropic mixture with water and a high-boiler fraction containing water and propylene glycol.

La présente invention concerne un procédé de purification par distillation en continu du méthanol utilisé en tant que solvant pour la synthèse d'oxyde de propylène par réaction d'un hydroperoxyde avec du propylène, avec séparation simultanée des méthoxy propanols. L'invention se caractérise en ce que le mélange de solvants résultant de la synthèse est séparé dans une colonne à paroi de séparation en une fraction à bas point d'ébullition qui contient du méthanol, une fraction à point d'ébullition intermédiaire qui contient des méthoxy propanols en tant qu'azéotropes avec de l'eau, et une fraction à point d'ébullition élevé qui contient de l'eau et du propylène glycol.

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