Process for producing aliphatic diols

Details Process for producing aliphatic diols Process for producing aliphatic diols

1998-12-03

2000-03-14

Killos, Paul J.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568852, C07C 2914

Patent

active

060375043

ABSTRACT:
In a process for producing aliphatic .alpha.,.omega.-diols comprising 4 to 12 C atoms from aliphatic .alpha.,.omega.-dicarboxylic acids comprising 4 to 12 C atoms, an oligoester of average chain length n=3 to n=4.5 and with an acid number of 40 to 60 mg KOH/g reaction mixture is first formed from a diol and a dicarboxylic acid, which oligoester is thereafter catalytically hydrogenated in the liquid phase. Hydrogenation is carried out continuously at 180 to 250.degree. C. and at an H.sub.2 pressure of 100 to 400 bar, over a pelletised catalyst which is free from Zn oxide and which comprises pressed powders of Cu, Mn and Al oxides with a content of at least one oxide of metals of subgroup VI of the periodic table of the elements (Mendeleev). The amount of H.sub.2 is 20 to 100 times the amount required stoichiometrically.

REFERENCES:
patent: 5696303 (1997-12-01), Darsow et al.

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