Approximately 70 % of all nitric acid produced is used for the production of ammonium nitrate, which is used in fertilizers.
A large portion of the nitric acid manufactured in the world is via the high-temperature catalytic oxidation of ammonia. This process consists of three main steps: ammonia oxidation, nitric oxide oxidation and absorption. Vaisala K-PATENTS® Saunders Body Refractometer PR-23-W is mounted in the outlet pipe of the absorber to control the absorption process and to get a stable nitric acid concentration value. The Teflon Body Refractometer PR-23-M should be installed in a bypass.
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