Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1980-07-28
1981-06-30
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
204112, C25C 106
Patent
active
042761344
ABSTRACT:
A process for removing chlorate from a caustic solution by the reduction of the chlorate with metallic iron. The process is particularly distinguished by the steps of contacting the caustic solution with iron to reduce the chlorate to chloride, contacting the caustic solution containing dissolved iron therein with a conductive substrate to electrolytically precipitate the iron on the substrate, thus providing a caustic solution which is substantially free from iron and chlorate ions, separating the purified portion of the caustic solution, and periodically using the iron coated substrate for treating an untreated portion of the caustic solution to reduce the chlorate to chloride, and periodically reusing the iron depleted substrate, for recovering dissolved iron from the caustic solution. The process of this invention decreases the chlorate content of caustic solutions to an acceptable level of a few ppm and also recovers dissolved iron on an iron depleted substrate for reuse and further reduction of chlorate of an untreated portion of the caustic solution.
REFERENCES:
patent: 2270376 (1942-01-01), Ladd
patent: 2403789 (1946-07-01), Cummins
patent: 2404453 (1946-07-01), Osborne et al.
patent: 3244605 (1966-04-01), Hotchkiss et al.
patent: 3784456 (1974-01-01), Otto
Mosetti Jacques
Porta Augusto
Andrews R. L.
The Dow Chemical Company
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