Acetaldehyde removal from methyl acetate by distillation at...

C - Chemistry – Metallurgy – 07 – C

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C07C 51/12 (2006.01) C07C 67/54 (2006.01)

Patent

CA 2704289

A method for removing acetaldehyde from a mixture of methyl acetate, methanol and acetaldehyde includes: (a) feeding the mixture of methyl acetate, methanol and acetaldehyde to a distillation column; (b) distilling the feed mixture of methyl acetate methanol and acetaldehyde at a pressure of 10 psig or more to generate an overhead vapor stream enriched in acetaldehyde as compared with the feed mixture and a residue stream depleted in acetaldehyde as compared with the feed mixture; and (c) with-drawing the residue stream depleted in acetaldehyde from the distillation column.

L'invention porte sur un procédé d'élimination d'acétaldéhyde d'un mélange d'acétate de méthyle, de méthanol et d'acétaldéhyde, qui consiste : (a) à introduire le mélange d'acétate de méthyle, de méthanol et d'acétaldéhyde dans une colonne de distillation ; (b) à distiller le mélange d'alimentation d'acétate de méthyle, de méthanol et d'acétaldéhyde à une pression d'au moins 10 psig pour générer un courant de vapeur de tête enrichi en acétaldéhyde par comparaison avec le mélange d'alimentation et un courant résiduel appauvri en acétaldéhyde par comparaison avec le mélange d'alimentation ; et (c) à retirer le courant résiduel appauvri en acétaldéhyde de la colonne de distillation.

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