Recovery of nitrating acid mixtures from nitration processes

Details Recovery of nitrating acid mixtures from nitration processes Recovery of nitrating acid mixtures from nitration processes

C - Chemistry, Metallurgy

07

C

C07C 201/16 (2006.01) C07B 63/00 (2006.01) C07C 201/08 (2006.01)

Patent

CA 2563007

The invention relates to a process for removing and recovering nitrating acid mixtures, in particular nitric acid, sulphuric acid and oxides of nitrogen, from the nitrated crude products occurring in the nitration of nitratable aromatic compounds after the nitrating acid has been separated off, by acidic scrubbing by means of a multistage extraction process, the extraction process comprising a cross-flow extraction with downstream countercurrent extraction. The process permits essentially complete recovery of the abovementioned acids, including the oxides of nitrogen, in high concentrations, so that they can be recycled to the nitration and no longer pollute the wastewater.

L'invention concerne un procédé d'élimination et de récupération de mélanges de nitration acides, en particulier de l'acide nitrique, de l'acide sulfurique et des oxydes d'azote, à partir de produits bruts nitrés apparaissant dans la nitration de composés aromatiques nitratables après que l'acide de nitration a été séparé, par lavage acide au moyen d'un procédé d'extraction en plusieurs étapes, le processus d'extraction comprenant une extraction à contre-courant en aval. Le procédé permet essentiellement la récupération complète des acides susmentionnés, y compris les oxydes d'azote, dans des concentrations élevées, de telle sorte qu'ils peuvent être recyclés à la nitration et plus polluer les eaux usées.

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