US 10,280,085 B2 · Process and plant for preparing nitric acid

Abstract

A process for preparing nitric acid may involve vaporizing ammonia in at least one first ammonia vaporizer to produce an ammonia gas, oxidizing this ammonia gas to nitrogen dioxide in a plant section of a nitric acid plant, and absorbing the nitrogen dioxide in water to produce nitric acid. A residual gas containing nitrous gases may be taken off from the plant section of the nitric acid plant and conveyed to a residual-gas cleaning apparatus. The residual gas containing nitrous gases may be reduced by means of ammonia in the residual-gas cleaning apparatus, wherein ammonia-containing wastewater obtained in the at least one first ammonia vaporizer may be conveyed to the residual-gas cleaning apparatus. Such a process may eliminate or at least substantially reduce ammonia-containing wastewater. Furthermore, a plant can be used in this process for preparing nitric acid.

Claims19

Dependent claims

A process for preparing nitric acid comprising:

vaporizing ammonia in an ammonia vaporizer to produce an ammonia gas;
oxidizing the ammonia gas to nitrogen dioxide in a plant section of a nitric acid plant;
absorbing the nitrogen dioxide in water to produce nitric acid;
taking off a residual gas containing nitrous gases from the plant section of the nitric acid plant;
conveying the residual gas to a residual-gas cleaning apparatus;
conveying ammonia-containing wastewater to the residual-gas cleaning apparatus;
and
reducing the residual gas by way of ammonia in the residual-gas cleaning apparatus.

5 more elements

Dependencies are inferred from the claim text.

Process and plant for preparing nitric acid

Life of this patent

Process and plant for preparing nitric acid

Life of this patent

Abstract

Claims19