Process for the removal of nitrogen oxides (nx oy) from waste gases of ammonia oxidation plants.

摘要

This invention relates to a process for the remotion of the nitrogen oxides contained in the waste gases coming from the catalytic oxidation plants of ammonia. The process includes the absorption of the gases in a mixture of sulphuric and nitric acid. The process allows to obtain the double advantage to eliminate the dangerous nitrogen oxides pollution and to recovery a very useful product, the nitrosyl hydrogen sulphate.