Process for producing nitric acid
AssigneesYara International Asa, The University of Sydney
InventorsBrian Scott Haynes, Anthony Matthew Johnson
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Abstract
A process is disclosed for removing nitrous components from a raw liquid nitric acid stream to produce a bleached nitric acid product (55). The raw liquid nitric acid stream (37) is from an absorber (19) of a nitric acid process. The process comprises contacting the raw nitric acid liquid stream with an oxidising gas (12) in a bleaching stage (52). At least some of the gas effluent (12c) from the bleaching stage enters (12d) a combustion stage (15) of the nitric acid process. The oxidising gas (12) entering the bleaching stage (52) may comprise at least about one-third of an oxidising gas feed (12) to the nitric acid process. At least about one-tenth of the bleaching stage gas effluent (12c) may enter (12d) the combustion stage (15).
Claims20
A process for removing nitrous components from a raw liquid nitric acid stream to produce a bleached nitric acid product, the raw liquid nitric acid stream being from an absorber of a nitric acid process, the process comprising contacting the raw nitric acid liquid stream with an oxidising gas in a bleaching stage, wherein at least some of the gas effluent from the bleaching stage enters a combustion stage of the nitric acid process.
Dependencies are inferred from the claim text.