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

2006-10-16

2008-12-30

Sullivan, Daniel M (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C568S927000

Reexamination Certificate

active

07470826

ABSTRACT:
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-current 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.

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