Mixed acid or also called nitrating acid is a mixture of nitric and sulfuric acid. By binding the water produced in the chemical reaction, the sulfuric acid increases the nitration strength of the nitric acid so that high nitration grades (like required for TNT) can be achieved.

After the nitration process the spent mixed acid carries only reduced concentrations of nitric and sulfuric acid. For a proper recovery the acids need to be separated in a denitration column. The result is a weak sulfuric acid and a concentrated nitric acid. When combined with a sulfuric acid concentration system and a NOX absorption unit, a complete recovery of the acids is almost ensured.

Key Features
For mixed acids from nitration processes
Reduction of raw materials consumption and hazardous waste
Energy efficient process through heat recovery

Process Examples

Explosives and propellants


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