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US 2010/0061920 A1Published application
Process for producing stable ferric salts for water treatment applications
OwnerKevin Edward Janak, Levi James Groveinventors
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Abstract
A process is provided whereby a liquid ferrous sulfate or ferrous chloride solution containing 0.5-100% of the iron in the ferrous form (Fe2+) is oxidized in a continuous process using an ozone gas stream as an oxidant. The invention has advantages over prior art in that the process does not require additional elevated pressures (>1 atm), elevated temperatures, or additional liquid oxidant, and can be run in a continuous, rather than a batch process.
Claims9
A continuous method of preparing ferric solution selected from ferric sulfate and ferric chloride comprising:
- a. introducing a ferrous liquid selected from ferrous sulfate and ferrous chloride having a total iron concentration greater than 5 percent by weight into a reaction contact zone;
- and
- b. introducing and mixing an ozone containing gas having an ozone content of at least 1 percent by weight with said ferrous liquid in said reaction contact zone;
- and
- c. reaching said mixture at a temperature of between about 95° C. and 100° C. for a period of between one and five hours to convert the ferrous liquid substantially to a ferric solution;
- and
- d. cooling and filtering the reaction product to obtain a ferric solution containing at least 10% total iron.
4 more elements
Dependencies are inferred from the claim text.