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US 12,252,399 B2Granted
Bleaching tower and method for nitric acid production
AssigneeYara International Asa
InventorsHalvor Oien, Arnulf Idar Melgard
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AssigneeYara International Asa
InventorsHalvor Oien, Arnulf Idar Melgard
Estimating the term…
A vertical bleaching tower for removing dissolved nitrogen oxides from an aqueous nitric acid solution using a stripping gas such as air, nitrogen, oxygen or combinations thereof in a process for producing nitric acid, comprising a structured packing; a liquid distributor comprising a feed box having a serrated weir for distribution of the aqueous nitric acid solution comprising the dissolved nitrogen oxides through upward-pointing serrations of the serrated weir into perforated trays of the liquid distributor and located above the structured packing for distributing the aqueous nitric acid solution comprising the dissolved nitrogen oxides to the structured packing; an inlet and outlet, both suitable for aqueous nitric acid solution; and an inlet and outlet, both suitable for the stripping gas. The present invention further comprises a bleaching method for removing dissolved nitrogen oxides from an aqueous nitric acid solution in a vertical bleaching tower.
A vertical bleaching tower for removing dissolved nitrogen oxides from an aqueous nitric acid solution comprising said nitrogen oxides, using a stripping gas substantially devoid of nitrogen oxide gases, selected from air, nitrogen, oxygen or combinations thereof, in a process for producing nitric acid, the vertical bleaching tower comprising:
A vertical bleaching tower for removing dissolved nitrogen oxides from an aqueous nitric acid solution comprising said nitrogen oxides, using a stripping gas substantially devoid of nitrogen oxide gases, selected from air, nitrogen, oxygen or combinations thereof, in a process for producing nitric acid, the vertical bleaching tower comprising:
Dependencies are inferred from the claim text.