Brief description of the recovery of nitric acid in a mixture of aromatic compounds dinitrated

摘要

A treatment process is claimed of a flux obtained from (1) a dinitration reaction of an aromatic compound with a nitrating mixture containing nitric acid, then (2) separation of the nitrating acid; the flux comprises a dinitrated aromatic compound in which a fraction of the nitrating acid remains. The process comprises the following stages:- a) distillation or stripping of the flux; b) recycling of the nitric acid recovered at the column head in the nitration process; c) treatment of the flux free of nitric acid containing dinitrated aromatics, by washing.