Recovery of nitric acid from nitration processes

Details Recovery of nitric acid from nitration processes Recovery of nitric acid from nitration processes

1995-09-15

1998-05-26

Geist, Gary

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

Organic compounds

Oxygen containing

568932, C07C20508

Patent

active

057568677

ABSTRACT:
A process for the removal and recovery of nitric acid, sulphuric acid and nitrous oxide (NO.sub.x) from crude dinitrotoluene (DNT) obtained by nitrating with a nitrating acid, a benzene derivative selected from the group consisting of tolulene or mononitrotoluene (after separation from the dinitrotoluene from the nitrating acid, wherein the crude dinitrotoluene is extracted in a plurality of steps whereby a dilute aqueous solution of nitric, sulfuric and nitrous acids countercurrently contacts the crude dinitrotoluene, the volume ratio of the dinitrotoluene to the aqueous solution being between 1:3 and 10:1, the extraction steps resulting in the formation of an aqueous extract which is blended directly into the nitrating acid for re-use in the acid nitration of the benzene derivative.

REFERENCES:
patent: 3204000 (1965-08-01), Samuelsen et al.
patent: 5001286 (1991-03-01), Witt et al.

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