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AssigneeDegussa AG
InventorsHans Birkenbeil, Ulrich Brand, Gustaaf Goor, Wolfgang Kunkel
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A method is shown for the separation of catalyst-free working solution from working solution, containing noble-metal black, especially palladium black as catalyst, of the hydrogenation cycle of the so-called anthraquinone method for the production of hydrogen peroxide by filtration of the catalyst-containing working solution using filter candles. The filter candles are formed of an open-pore support body based on a carbon material or metallic or ceramic material with an average pore width in a range of 5 to 100 .mu.m and of a single-layer or multi-layer membrane of ceramic material with an average pore width in a range of at least about 1 up to 10 .mu.m located on the outside surface of the support body.
A method for the separation of catalyst-free working solution from working solution containing noble-metal black as catalyst, obtained in the hydrogenation cycle of the anthraquinone method for the production of hydrogen peroxide comprising filtering the catalyst-containing working solution using filter candles formed of an open-pore inert support body with an average pore width in a range of 5 to 100 .mu.m and of a single-layer or multilayer membrane of ceramic material with an average pore width in a range of at least about 1 up to 10 .mu.m located on one side of and in contact with the support body wherein the catalyst-containing working solution passes through the membrane first.
Dependencies are inferred from the claim text.