C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 29/80 (2006.01) C07C 29/149 (2006.01) C07C 31/20 (2006.01) C07C 45/82 (2006.01) C07C 47/19 (2006.01) C07D 307/20 (2006.01)
Patent
CA 2322746
The invention relates to a method for separating a mixture containing butane- 1,4-diol and at least one other compound from the following group: 4-hydroxybutyraldehyde, its cyclical hemiacetal and its cyclical whole acetals with at least one other alcohol, by distillation. The distillation is carried out in the presence of a compound which acts as an alkali. The mixture to be separated preferably contains a cyclical whole acetal of 4-hydroxybutyraldehyde with the other alcohol, this alcohol having a lower boiling temperature than butanediol and being in free form. The method is especially suitable for distilling and separating mixtures produced in the hydrogenation of maleic acid derivatives.
L'invention a pour objet un procédé de séparation distillante d'une composition contenant du butane-1,4-diol et au mois un autre composé choisi dans le groupe composé de 4-hydroxybutyraldéhyde, de son demi-acétal cyclique, de son acétal complet cyclique et d'au moins un autre alcool, la distillation ayant lieu en présence d'un composé à action alcalique. De préférence, la composition à séparer contient un acétal complet cyclique de 4-hydroxybutyraldéhyde et l'autre alcool dont la température d'ébullition est inférieure à celle du butanediol et qui se présente sous forme d'alcool libre. Le procédé convient particulièrement à la séparation distillante des compositions se précipitant lors de l'hydratation de dérivés d'acide maléïque.
Fischer Rolf
Liang Shelue
Pinkos Rolf
Basf Aktiengesellschaft
Robic
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