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AssigneesThyssenkrupp Industrial Solutions AG, thyssenkrupp AG
InventorBjoern STEGT
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An absorption tower for production of nitric acid by the Ostwald process may include sieve trays that are arranged on top of one another and each spaced apart from one another, a water inlet in an upper region of the absorption tower, an inlet for gaseous nitrogen oxides in a lower region of the absorption tower, and a column bottom that is disposed in the lower region of the absorption tower beneath a lowermost sieve tray and is divided by a dividing wall into a first, radially inner region and at least a second, radially outer region. Nitric acid that trickles down from the lowermost sieve tray with a higher concentration can be collected in a middle region. The less-concentrated nitric acid that then effluxes from sieve trays higher up can then be collected separately in a region farther outward.
-20. (canceled)
An absorption tower for a plant for production of nitric acid by the Ostwald method, the absorption tower comprising:
A plant for producing nitric acid, the plant comprising an absorption tower that includes:
A process for producing nitric acid by the Ostwald process, the process comprising absorbing gaseous nitrogen oxides in water to produce nitric acid in an absorption tower, wherein the nitrogen oxides are introduced into the absorption tower in a lower region and water is introduced into the absorption tower in an upper region, wherein the nitric acid formed flows downward through sieve trays arranged one on top of another and each spaced apart from one another, wherein the nitrogen oxides flow upward from below through the absorption tower in countercurrent with an aqueous liquid, wherein in a column bottom of the absorption tower concentrated nitric acid accumulates, wherein a dividing wall in the column bottom creates mutually divided regions in which nitric acid of different concentration is collected, wherein by a cover above one of the mutually divided regions nitric acid that effluxes first from the sieve trays flows only into one of the mutually divided regions.
Dependencies are inferred from the claim text.