Process for preparing 1,6-hexanediol

C - Chemistry – Metallurgy – 07 – C

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C07C 29/149 (2006.01) C07C 31/20 (2006.01) C07D 313/04 (2006.01)

Patent

CA 2744126

The invention relates to a method for producing 1,6-hexanediol, preferably of at least 99% purity, and especially practically free from 1,4-cyclohexanediols, from a carboxylic acid mixture that is obtained as a byproduct of the oxidation of cy-clohexane to cyclohexanone/cyclohexanol using oxygen or oxygen-containing gases and by extraction of the reaction mixture with water, by transesterification and hydration to form hexanediol, the yield in valuable products being increased by adding a mono-mer or polymer polyol with at least three hydroxyl functional groups after a transesterification stage in which catalysts that contain at least one element of groups 3 to 14 are used.

La présente invention concerne un procédé de préparation de 1,6-hexanediol ayant de préférence une pureté d'au moins 99% et étant pratiquement dépourvu de 1,4-cyclohexanediols, à partir d'un mélange d'acides carboxyliques qui est obtenu en tant que produit auxiliaire de l'oxydation de cyclohexane en cyclohexanone/cyclohexanol avec de l'oxygène ou des gaz contenant de l'oxygène, et par extraction d'eau du mélange réactionnel, par estérification et hydratation en hexanediol, les rendements en produits d'intérêt étant augmentés par adjonction, après une étape d'estérification au cours de laquelle sont utilisés des catalyseurs contenant au moins un élément des groupes 3 - 14, d'un polyol monomère ou polymère comportant au moins 3 fonctions hydroxyle.

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