Recovery of sodium nitrite from by-product process liquors conta
Recycling method for the preparation and processing of a hydroxy
Redox-potential control for hydrogen peroxide in nitric acid
Regeneration of nitrous acid by oxidation with direct applicatio
Removal of nitrate and/or organic pollutants from effluents
Removal of nitrous oxide from exit gases containing this compoun
Removal of nitrous oxide from gases containing hydrogen, nitric
Removing nitrates with an organic amine salt and ion exchange