Method and system for concentrating waste sulphuric acids...

Details Method and system for concentrating waste sulphuric acids... Method and system for concentrating waste sulphuric acids...

2011-08-02

2011-08-02

Vanoy, Timothy C (Department: 1734)

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

C423S523000, C423S525000, C422S129000, C422S160000, C422S161000, C422S187000

Reexamination Certificate

active

07988942

ABSTRACT:
A method for recovering diluted waste sulfuric acid by extractive rectification with concentrated sulfuric acid which is re-concentrated for reutilization. Waste sulfuric acid from the nitration process is fed into a first column, optionally together with another waste sulfuric acid in a DNT washing acid, and divided into an overhead product containing nitric acid and nitro-organic compounds and a prepurified sulfuric acid in the bottom product. The prepurified sulfuric acid withdrawn from the bottom of the first column is fed to the top of a second column, into the bottom zone of which another waste sulfuric acid is fed in the form of a diluted sulfuric acid recovered from the nitric acid concentration system so the prepurified sulfuric acid from the first column is further purified in the second column and is preconcentrated along with the diluted sulfuric acid recovered from the extractive rectification of nitric acid.

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Helmold von Plessen et al.: “Entwicklung des Pauling-Verfahrens zur Regeneration von Abfallschwefelsäure”, in: Chem.-Ing.-Tech. 59, 1987, No. 6, pp. 470-475.

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