Nitrogen trioxide

Nitrogen trioxide (CAS 10544-73-7), also known as dinitrogen trioxide, is an unstable nitrogen oxide that functions as a reactive oxidizing intermediate in industrial chemical processes. It is generated in situ during nitric acid production and nitrogen oxide chemistry, where it acts as a key oxidant and pH-influencing species in aqueous systems.

In water treatment, nitrogen trioxide species contribute to oxidative disinfection and pH regulation within nitrous acid equilibria, supporting process control in municipal systems. Pulp and paper operations utilize nitrogen oxide chemistry in bleaching sequences where selective oxidation brightens cellulose fiber without the use of chlorine-based agents.

Mining and metals processing draws on its corrosion-inhibiting behavior in acidic leach circuits, where controlled nitrogen oxide atmospheres protect critical process equipment. Industrial and institutional cleaning formulations leverage its oxidizing capacity in heavy-duty descaling and surface preparation products targeting mineral deposits and organic soils.

Nitrogen trioxide is not commercially supplied as an isolated, stable product. It is generated on-site or in-process from nitrogen oxide precursors and nitric acid systems. Buyers typically source it indirectly through nitric oxide supply chains, with technical-grade nitrogen oxides available in pressurized cylinders or bulk liquid form.