Recovery of nitrating acid mixtures from nitration processes
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United States of America Patent
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Dec 30, 2008
Grant Date -
Apr 19, 2007
app pub date -
Oct 16, 2006
filing date -
Oct 18, 2005
priority date (Note) -
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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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