Catalyst and process for preparing saturated ethers by hydrogenating unsaturated ethers

2:

• The supported catalyst according to claim 1, wherein the catalyst support material has a BET surface area of 200 to 320 m2/g.

3:

• The supported catalyst according to claim 1, wherein palladium content is 0.1 to 10% by mass.

4:

• The supported catalyst according to claim 1, wherein the palladium palladium-γ-alumina is present on the support material in a boundary layer which has a thickness of 50 to 300 μm.

5:

• The supported catalyst according to claim 1, wherein a mean pore radius of the support material is 2 to 50 nm.

6:

• The supported catalyst according to claim 5, wherein the mean pore radius of the support material is 5 to 30 nm.

7:

• The supported catalyst according to claim 1, wherein the support material comprises at least one selected from the group consisting of sulphate and silicon dioxide.

8:

• A process for preparing a supported catalyst according to claim 1, comprising
• applying a solution comprising a palladium compound to a support material which comprises 1 to 1000 ppm by mass of sodium oxide and has a specific pore volume of 0.4 to 0.9 ml/g and a BET surface area of 150 to 350 m2/g to give a treated support material, and then
• drying the treated support material at a temperature of 80 to 150° C.

9:

• The process according to claim 8, wherein the solution comprising the palladium compound is sprayed onto the support material at a temperature of 80° C. or higher.

10:

• The process according to claim 8, wherein the palladium compound is palladium acetate, palladium acetylacetonate, palladium chloride, palladium nitrate dihydrate, or palladium sulphate dihydrate.

11:

• A process for hydrogenating a polyunsaturated ether with hydrogen to give a corresponding saturated ether, the process comprising:
• hydrogenating a polyunsaturated ether with hydrogen in the presence of the supported catalyst according to claim 1,
• to give the corresponding saturated ether.

12:

• The process according to claim 11, wherein hydrogenating is performed at a temperature of 50 to 150° C.

13:

• The process according to claim 11, wherein the hydrogenating is performed at a pressure of 20 to 150 bar.

14:

• The process according to claim 11, wherein the hydrogenating is performed in the presence of a solvent.

15:

• The process according to claim 14, wherein the solvent is a saturated ether obtained in the hydrogenating.

16:

• The process according to claim 11, wherein a concentration of the polyunsaturated ether to be hydrogenated is in a reactor feed and is adjusted to 1 to 35% by mass.

17:

• The process according to claim 11, wherein the polyunsaturated ether is at least one selected from the group consisting of unsubstituted and alkyl-substituted octadienyl alkyl ethers, which is hydrogenated to the corresponding saturated ether in the hydrogenating.

18:

• The process according to claim 17, wherein 1-methoxy-2,7-octadiene is hydrogenated to 1-methoxyoctane in the hydrogenating.

19:

• The supported catalyst according to claim 1, wherein the catalyst support material has a BET surface area of 220 to 300 m2/g.

20:

• The supported catalyst according to claim 2, wherein palladium content is 0.1 to 10% by mass.