Liquid purification or separation – Processes – Chemical treatment
Patent
1985-08-16
1986-08-05
Wyse, Thomas
Liquid purification or separation
Processes
Chemical treatment
210909, 568934, C02F 172
Patent
active
046042148
ABSTRACT:
This invention relates to a process for removing trinitrocresols and picric acid contaminants from a wastewater stream generated in the production of nitroaromatics, particularly dinitrotoluene, by the mixed acid technique. The process involves contacting the crude dinitrotoluene generated by the mixed acid technique with an alkaline medium to generate an alkaline wash water containing water soluble nitrocresols and picric acid therein. This wastewater then, is separated from the organic component or may be recycled for contact with further quantities of crude dinitrotoluene product from the reactor. When the concentration of the water soluble salts of trinitrocresols and picric acid is of sufficient concentration, the wash water is treated with aqueous acid in sufficient proportion to reduce the pH to a level from 3-4. After pH adjustment, the medium is contacted with hydrogen peroxide and a ferrous ion under conditions to effect oxidation of a substantial portion of the trinitrocresol to carboxylic acid, nitric acid and carbon dioxide.
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Hugh R. Eisenhauer, Oxidation of Phenolic Wastes, Sep. 1964, pp. 1116-1128.
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Albanese Thomas A.
Carr Richard V. C.
Gonzalez Roland
Martin Carl J.
Air Products and Chemicals Inc.
Brewer Russell L.
Innis E. Eugene
Simmons James C.
Wyse Thomas
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