A Method for Obtaining Nitric Acid
Foreign Technology Division Air Force Systems Command Andrews AFB United States
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The invention concerns the industrial production of nitric acid of increased concentration. By using the method, it is possible to increase the concentration of acid to 70-74 without using additional nitric oxides, resulting in conversion of a maximum amount of the oxide of nitrous gases to acid. In this method the process of acid formation under conditions of condensation of water vapors takes place in a refrigerator-condenser at a pressure of 5 atm. Unreacted nitric oxides are absorbed by nitric acid at temperatures no higher than -5 deg C in absorption column, with subsequent bleaching. The obtained 58-62- nitric acid is strengthened to 70-74 in the absorption part of the bleaching column at a temperature of 25-45 deg C by concentrated gases in the lower part of the bleaching column.
- Industrial Chemistry and Chemical Processing