Process for the production of 1,3-propanediol by catalytic...

C - Chemistry – Metallurgy – 07 – C

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C07C 29/141 (2006.01) C07C 31/20 (2006.01)

Patent

CA 2542950

A process for preparing 1,3-propanediol comprising the steps of: (a) preparing an aqueous mixture of 3-hydroxypropanal, (b) passing said aqueous 3- hydroxypropanal mixture to a hydrogenation zone wherein the hydrogenation zone is comprised of at least two stages wherein the hydrogenation in the first stage is carried out under hydrogenation conditions at a temperature in the range of 50 to 130~C in the presence of a fixed bed or slurry hydrogenation catalyst and wherein an acidic co-catalyst is added or present in at least one of the later stages and the hydrogenation in said later stages is carried out under hydrogenation conditions at a higher temperature than that of the first hydrogenation stage and in the range of 70 to 155~C to form an aqueous solution of 1,3-propanediol; and (c) recovering said 1,3-propanediol.

L'invention concerne un procédé permettant de préparer 1,3-propanediol qui consiste: (a) à préparer un mélange aqueux de 3-hydroxypropanal, (b) à passer ledit mélange aqueux de 3-hydroxypropanal dans une zone d'hydrogénation, celle-ci étant constituée d'au moins deux étages où, dans le premier étage, l'hydrogénation est exécutée dans des conditions d'hydrogénation à une température comprise entre 50 et 130 ·C en présence d'un lit fixe ou d'un catalyseur d'hydrogénation à base de boue, et un co-catalyseur acide est ajouté, ou présent, au niveau d'au moins un des étages ultérieurs, l'hydrogénation à ces étages étant réalisée dans des conditions d'hydrogénation à une température supérieure à celle du premier étage d'hydrogénation et comprise entre 70 et 155 ·C pour former une solution aqueuse de 1,3-propanediol; et (c) à récupérer ledit 1,3-propanediol.

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