Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1985-05-07
1986-07-01
Hruskoci, Peter
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210712, 210724, 210726, 210909, 568932, 568934, C02F 152, C02F 166
Patent
active
045978751
ABSTRACT:
This invention relates to a process for removing nitrocresols 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 is separated from the organic component and recycled for contact with further quantities of crude dinitrotoluene product from the reactor. When the concentration of the water soluble salts of nitrocresols and picric acid is of sufficient concentration the wash water is treated with aqueous acid in sufficient proportion to convert the water soluble salts to water insoluble organics. After treatment with acid, the organic material is separated from the wastewater and the organics incinerated.
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patent: 4224249 (1980-09-01), Kunz et al.
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Carr Richard V. C.
Sawicki John E.
Toseland Bernard A.
Air Products and Chemicals Inc.
Brewer Russell L.
Hruskoci Peter
Innis E. Eugene
Simons James C.
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