Detoxification or decontamination of effluents and/or flue gases

Details Detoxification or decontamination of effluents and/or flue gases Detoxification or decontamination of effluents and/or flue gases

1982-04-16

1984-07-31

Wyse, Thomas G.

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210720, 210913, 210919, 423235, C02F 162

Patent

active

044629117

ABSTRACT:
This invention provides a process for detoxifying or decontaminating liquid effluents and/or waste gas containing poisonous chromium (VI) NOx by reacting these with each other with formation of chromium (III) and higher oxide(s) of N. Optionally in addition another suitable reducing agent may be used.
The process is particularly useful, for example, in a plant such as a stainless steel pickling plant where both these chemical components are available. Preferably liquid-liquid extraction may be used to extract and recover nitric acid formed as an oxidation product and preferably if additional chromium (VI) is required, this may be provided by electrolytic oxidation of chromium (III) to chromium (VI) in a suitable chemical circuit.

REFERENCES:
patent: 3725266 (1973-04-01), Haviland
patent: 3810542 (1974-05-01), Gloster et al.
patent: 3901805 (1975-08-01), Stewart

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