LYCOS RETRIEVER 
Nitric Acid: Process
built 657 days ago
Chemoprojekt has provided its selective catalytic reduction, (Renox) process for the nitric acid plant. This process is used to decrease the NOx content in the outlet gases. Chemoprojekt says this technology offers the advantage of, amongst other things, low investment costs, high catalyst conversion and high heat recovery.
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Depending on schemes used in energy recovery, the process requires about 1 ton of steam per ton of nitric acid, whereas the conventional process requires about 1.8 ton. Capital costs are lower because tantalum requirements are only about 25% of those in a conventional plant.
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Various other processes for making nitric acid have been suggested, but owing to the low price of Chili saltpetre, none of them are now in use. An ingenious proposal to use the" still liquors" from the chlorine manufacture, instead of sulplnll'ic acid for decomposing sodium nitrate, is based on the following reactions:-
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The fertiliser industry uses dilute nitric acid in the range 50 - 65% strength, but other processes require concentrated acid. The production process used results in dilute acid, which must then be further treated to produce the concentrated acid.
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[B]y vaporizing weak nitric acid, it is feasible to substantially reduce the requirement for expensive tantalum heat transfer area. Also, the process can be designed to use low pressure steam only.
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