Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1978-05-25
1979-08-21
Hearn, Brian
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
423478, 423475, 204 95, C01G 3714, C01B 1102
Patent
active
RE0300810
ABSTRACT:
The present invention relates to removal of chromate from an aqueous solution of an alkali metal chlorate and chloride, particularly sodium chlorate and sodium chloride in a selected ratio which has been obtained by the electrolysis of an aqueous solution of alkali metal chloride containing chromate in which the essentially chromate free aqueous solution of alkali metal chlorate and chloride contains the chlorate and chloride in essentially the same selected ratio. In the process the chromate containing aqueous solution of alkali metal chlorate and chloride is acidified with hydrochloric acid to a pH value not smaller than 0.5 and passed through an anionic ion exchange resin bed which has previously been saturated with alkali metal chlorate and chloride. The bed is then regenerated by passing an aqueous solution of an alkali metal hydroxide and alkali metal chloride therethrough to remove chromate therefrom. An acidified aqueous solution of alkali metal chloride is then passed through the bed to convert the resin to an acid form and an aqueous solution of essentially chromate free alkali metal chlorate and chloride acidified with hydrochloric acid to a low pH value but not smaller than 0.5 is passed through the bed to saturate the resin with the alkali metal chlorate. The effluents from the regeneration stages may then be used as feedstock for the electrolysis to produce the aqueous solution of alkali metal chlorate and chloride, after suitable additions of chromate and chloride solutions.
REFERENCES:
patent: 3223620 (1965-12-01), 0berhofer
patent: 3414510 (1968-12-01), Oberhofer
patent: 3664950 (1972-05-01), Saraceno
patent: 3835001 (1974-09-01), O'Brien
Hearn Brian
Huron Chemicals Limited
LandOfFree
Ion exchange chromate removal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ion exchange chromate removal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ion exchange chromate removal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1318225