US 6,982,072 B2
Process for the production of hydrogen peroxide
Bernhard Maurer, Freistritz/Drau (Austria)
Assigned to Degussa AG, Düsseldorf (Germany)
Filed on Feb. 14, 2003, as Appl. No. 10/367,174.
Claims priority of application No. 102 07 407 (DE), filed on Feb. 21, 2002.
Prior Publication US 2003/0165422 A1, Sep. 04, 2003
Int. Cl. C01B 15/023 (2006.01)
U.S. Cl. 423—588 18 Claims
OG exemplary drawing
 
1. A process for the production of hydrogen peroxide by the anthraquinone process in a continuously operated production plant, comprising:
(i) in a hydrogenation step, hydrogenating an organic working solution containing one or more anthraquinone derivatives in the presence of a heterogeneous catalyst, to form a hydrogenated working solution,
(ii) in an oxidation step, oxidizing the hydrogenated working solution to form an oxidized working solution, with the formation of hydrogen peroxide, by introducing an oxygen-containing oxidizing gas, at an excess pressure Pi of at least 1 bar into an oxidation reactor and contacting it with the working solution from step (i), withdrawing oxidation waste gas from the oxidation reactor and optionally purifying it in a waste-gas purification plant, and
(iii) recovering the hydrogen peroxide from the oxidized working solution,
wherein the oxidation waste gas has an excess pressure Pa which is less than Pi but greater than atmospheric pressure P0, and passing the oxidation waste gas as a flow of propellant gas to at least one gas jet and thereby producing a vacuum for auxiliary processes required in the anthraquinone process.