Production of nitric acid of specified concentration, useful in the production of adipic acid, caprolactam, toluene diisocyanate etc., by one- or 2-pressure combustion of ammonia and absorption uses dried air supply

摘要

In the production of 67-76 wt.% nitric acid (HNO3) by a one- or two-pressure process, in which compressed process air is used for combustion of ammonia and the resultant nitrous gases are (partly) absorbed by water, giving HNO3, the process air supplied from the outside is dried to reduce its water vapor content.