Thyssenkrupp Industrial Solutions Ag

Thyssen Krupp Ag

Thyssenkrupp Uhde Gmbh

Klaus Ruthardt

Rolf Siefert

Meinhard Schwefer

Jürgen Fuchs

Michael Groves

Alberto Cremona

Edoardo Vogna

Paul Kern

A system suitable for oxidizing ammonia with oxygen in the presence of catalysts is described. The system includes a reactor equipped with at least one supply line for a reactant gas mixture and at least one discharge line for a process gas; a catalyst comprising at least one transition metal oxide that is not an oxide of a platinum metal; and a device for adjusting a molar ratio of oxygen to ammonia of less than or equal to 1.75 mol/mol in the reactant gas mixture by mixing an oxygen-containing gas stream having an Ocontent of &#x3c;20% by volume with a chosen amount of ammonia. The oxygen-containing gas stream is produced by a device for: diluting an air stream with a gas stream comprising less than 20% by volume oxygen; or depleting oxygen from an oxygen-containing gas mixture, preferably from air; or by a combination thereof.

Method for oxidizing ammonia and system suitable therefor

An apparatus is provided for treatment of process gas formed during nitric acid production by catalytic oxidation of NH. The apparatus includes a reactor, a first catalyst bed for NO decomposition, an absorption tower to react the NOformed with an absorption medium downstream of the first catalyst bed, a device for adding NHadded to tailgas entering the second catalyst bed, and a second catalyst bed for NOreduction and further decrease in NO in the tailgas exiting the absorption tower. The second catalyst bed contains at least one iron-loaded zeolite catalyst. NO removal in the first catalyst bed is limited such that the process gas exiting the first catalyst bed exhibits a NO content of &#x3e;100 ppmv and a molar NO/NOratio of &#x3e;0.25. Treated gas exiting the second catalyst bed has a NOconcentration of &#x3c;40 ppmv and a NO concentration of &#x3c;200 ppmv.

Method for removing NO and NOfrom the nitric acid production process, and an installation suitable for same

A method for disposing a bed comprising particles in a burner through which a gas can flow, more particularly in a burner basket of an ammonia oxidation burner, where the particles are disposed such that the bed has a greater flow resistance in an edge region of the burner than in an inner region of the burner. Further, a burner basket for a burner may have a bed comprising particles, wherein the particles are disposed such that the bed has a greater flow resistance in an edge region of the burner basket than in an inner region of the burner basket.

Method for arranging a packing in a burner and burner basket for a burner

A burner basket for an ammonia oxidation burner includes a gas-permeable bottom plate, with a side wall that is spaced apart from the bottom plate by a gap, and a retaining device covering the bottom plate and the gap for retaining particles of a bulk material that can be arranged in the burner basket. A fastening element is arranged on the bottom plate, by which the retaining device is fixed in place. An ammonia oxidation burner comprises a burner for oxidizing ammonia and a burner basket.

Burner basket for an ammonia oxidation burner

The invention relates to a process and apparatus for preparing nitric acid by catalytic oxidation of NHby means of oxygen and subsequent reaction of the NOformed with an absorption medium in an absorption tower, which comprises a catalyst bed for NO decomposition arranged in the process gas downstream of the catalytic NHoxidation and upstream of the absorption tower in the flow direction and a catalyst bed for NOreduction and effecting a further decrease in the amount of NO arranged in the tailgas downstream of the absorption tower in the flow direction,

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Dortmund, Germany

Klaus Ruthardt