Process for preparing nitric acid having a concentration in the range from 50 to 77.8% by weight

Process for preparing nitric acid having a concentration in the range from 50 to 77.8% by weight

  • CN 101,687,642 A
  • Filed: 07/08/2008
  • Published: 03/31/2010
  • Est. Priority Date: 07/09/2007
  • Status: Active Application
First Claim
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1. one kind prepares the method that concentration is the nitric acid of 50-77.8 weight %, said method comprising the steps of:

  • -obtain to comprise NO and O with the production of over-stoichiometric ratio with air (2) catalytic vapor phase oxidation ammonia (1) 2Gaseous mixture (3), -cooling/condensation comprises NO and O 2Admixture of gas (3), O in this process 2NO is further oxidized to NO 2/ N 2O 4Acquisition comprises the aqueous solution (4) of nitric acid and comprises NO 2/ N 2O 4Gas streams (5) and -in absorption tower (A) with NO 2/ N 2O 4From comprising NO 2/ N 2O 4Gas streams (5) in counter-current absorption to industrial water (H 2O) obtaining concentration in is the nitric acid (7) of 50-77.8 weight % and contains NO xTail gas from absorption tower (6), wherein -be supplied to catalytic vapor phase oxidation by continuous detecting production with the water content of air (2) with regulate the water of productive use (Q-H that is supplied to absorption tower (A) thereupon 2O) amount with the water content of nitric acid (7) be adjusted to 50-77.8 weight % concentration and -with the NO of tail gas from absorption tower (6) xContent is adjusted to the concentration of 20-500ppm.

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