Alicyclic polycarboxylic ester mixtures with a high trans proportion and method for the production thereof
AssigneeEvonik Oxeno GmbH
InventorsDietrich Maschmeyer, Wilfried Bueschken, Michael Grass, Axel Tuchlenski
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Abstract
The present invention relates to the preparation of alicyclic polycarboxylic esters by ring-hydrogenation of the corresponding aromatic polycarboxylic esters on a catalyst which comprises at least one metal from the triad iron, cobalt, nickel, and at least one metal of the IInd, IIIrd, IVth, Vth, and/or VIth transition group of the Periodic Table. An alicyclic carboxylic ester mixture with a proportion above 10 mol % of the trans isomers. The use of the alicyclic polycarboxylic ester mixtures. Mixtures made from plastics and from alicyclic polycarboxylic ester mixtures.
Claims21
An alicyclic polycarboxylic acid ester mixture, comprising:
- at least two isomers of an alicyclic polycarboxylic acid ester whose structures are determined by the positions of the ester groups on the ring system of the ester compound, wherein the proportion of the trans isomers in the isomer mixture is above 10 mol %, the alicyclic polycarboxylic acid ester mixture being prepared by hydrogenating the corresponding aromatic polycarboxylic acid ester isomers over a catalyst which comprises at least one metal selected from the triad of elements consisting of iron, cobalt and nickel, together with at least one metal selected from the group consisting of the IInd, IIIrd, IVth, Vth and VIth transition group of the Periodic Table.
A process for preparing alicyclic polycarboxylic acid esters, comprising:
- hydrogenating an aromatic polycarboxylic acid ester isomer mixture in a mixed liquid/gas phase or liquid phase in three phase reactors in the presence of a catalyst which comprises at least one metal selected from the triad of elements consisting of iron, cobalt and nickel, together with at least one metal of the IInd, IIIrd, IVth, and/or Vth transition group of the Periodic Table, thereby preparing an alicyclic polycarboxylic acid ester isomer mixture that has a trans isomer content of greater than 10 mol %.
A process for preparing alicyclic polycarboxylic acid esters, comprising:
- continuously hydrogenating an aromatic polycarboxylic acid ester isomer mixture over a fixed catalyst bed which comprises at least one metal selected from the triad of elements consisting of iron, cobalt and nickel, together with at least one metal of the IInd, IIIrd, IVth, and/or Vth transition group of the Periodic Table, thereby preparing an alicyclic polycarboxylic acid ester isomer mixture that has a trans isomer content of greater than 10 mol %.
Dependencies are inferred from the claim text.