Method for producing 1,6-hexanediol

C - Chemistry – Metallurgy – 07 – C

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C07C 29/149 (2006.01)

Patent

CA 2305590

The invention relates to a method for producing 1,6-hexanediol by hydrogenating adipic acid esters and/or 6-hydroxycarboxylic acid esters in the gaseous phase at an elevated temperature and pressure in the present of chromium-free catalysts. Hydrogenation is carried out a) using catalysts containing copper, manganese and aluminium as essential constituents or in the presence of Raney copper, b) at temperatures of between 150 and 230°C and pressures of between 10 and 70 bar, c) at a molar ratio of hyrogen to hydrogenating ester of between 150 to 1 and 300 to 1; and d) at a catalyst load of between 0.01 and 0.3 kg C3-ester per litre of catalyst and hour.

L'invention concerne un procédé pour la préparation de 1,6-hexanediol par hydrogénation d'esters d'acide adipique et/ou d'esters d'acide 6-hydroxycarboxylique en phase gazeuse, à température et pression élevées, en présence de catalyseurs sans chrome, dans lequel on réalise l'hydrogénation a) en utilisant des catalyseurs contenant comme constituants essentiels du cuivre, du manganèse et de l'aluminium, ou bien en présence de cuivre de Raney, b) à des températures de 150 à 230 DEG C et à des pressions de 10 à 70 bars, c) à un rapport molaire hydrogène/ester à hydrogéner de 150/1 à 300/1 et d) avec une charge de catalyseur de 0,01 à 0,3 kg d'ester C3 par litre de catalyseur et par heure.

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