Nitric acid reconstitution

Details Nitric acid reconstitution Nitric acid reconstitution

C - Chemistry, Metallurgy

01

B

23/208

C01B 21/40 (2006.01)

Patent

CA 1154232

NITRIC ACID RECONSTITUTION ABSTRACT OF THE DISCLOSURE There is described a process for the recon- stitution of NOX gases to nitric acid comprising the steps of: 1. contacting the NOX gases in counter- current relationship in one or more packed columns with cooled 50 to 60 percent nitric acid to remove as nitric acid a major portion of the originally introduced NOX values and provide an acid solution leaving the column having a temperature below about 180°F; 2. compressing the residual gases from step 1 to from about 2 to about 6 atmospheres absolute; and 3. contacting the compressed gases from step 2 with from about 50 to about 60 percent nitric acid in a packed absorption column in counter-current relationship to remove substantially all of the remaining NOX values from the gas stream.

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