Method for producing an aliphatic dialdehyde monoacetal

Details Method for producing an aliphatic dialdehyde monoacetal Method for producing an aliphatic dialdehyde monoacetal

C - Chemistry, Metallurgy

07

D

C07D 317/26 (2006.01) B01D 3/14 (2006.01) B01D 3/32 (2006.01) C07C 45/60 (2006.01) C07C 45/71 (2006.01) C07C 45/82 (2006.01) C07C 47/198 (2006.01) B01D 1/22 (2006.01)

Patent

CA 2506794

The invention relates to a method for producing a pure aliphatic dialdehyde monoacetal by reacting the corresponding aliphatic dialdehyde or a precursor of the corresponding aliphatic dialdehyde with one or more aliphatic monohydric or polyhydric alcohols, during which water is isolated by distillation while obtaining a reaction mixture that is separated by distillation. The invention is characterized in that the separation by distillation is continuously carried out in a partition column during which pure aliphatic dialdehyde monoacetal is obtained as a side-stream of the partition column or the separation by distillation is continuously carried out in two distillation columns during which crude aliphatic dialdehyde monoacetal is obtained as a side-stream in the first distillation column, the crude aliphatic dialdehyde monoacetal is fed to the second distillation column, and pure aliphatic dialdehyde monoacetal is obtained as a side-stream from the second distillation column.

L'invention concerne un procédé permettant de produire un dialdéhyde monoacétal aliphatique pur par réaction du dialdéhyde aliphatique correspondant ou d'un précurseur dudit aldéhyde aliphatique correspondant, avec un ou plusieurs alcools aliphatiques monovalents ou polyvalents, de l'eau étant séparée par distillation, de manière à obtenir un mélange de réaction, qui est séparé par distillation. Ledit procédé se caractérise en ce que la séparation par distillation s'effectue en continu, dans une colonne à paroi de séparation. Le dialdéhyde monoacétal aliphatique pur est obtenu comme produit de soutirage latéral de la colonne à paroi de séparation ou dans deux colonnes de distillation. Le dialdéhyde monoacétal aliphatique pur est obtenu dans la première colonne de distillation sous forme de produit de soutirage latéral. Le dialdéhyde monoacétal aliphatique brut est acheminé jusqu'à la seconde colonne de distillation et le dialdéhyde monacal aliphatique pur sort de la seconde colonne de distillation sous forme de produit de soutirage latéral.

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