Processes for making stable ferric chloride solutions
AssigneeKemira Water Solutions, Inc.
InventorsKrister Eskilsson, Jeff Campbell, Stig Gunnarsson, Jan Pavlicek
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Abstract
Processes for forming ferric chloride solutions that are stable at relatively low temperatures and suitable for transportation without precipitation are provided. The stable ferric chloride solutions have an iron content of about 16 to about 23 weight percent and a hydrochloric acid content of about 11 to about 17 weight percent, wherein the ferric chloride solution is a stable solution and/or reversibly freezes at −10° C. Also disclosed are processes for reconstituting the stable ferric chlorides solutions to provide a final iron content of 10 to 14 weight percent and lower the concentration of hydrochloric acid contained therein.
Claims21
A process for stabilizing a ferric chloride solution, comprising:
- a) evaporating water from a ferric chloride solution to increase an iron content and decrease a hydrochloric acid concentration;
- and
- b) exposing the ferric chloride solution obtained from step a) to gaseous hydrochloric acid in an amount effective to decrease the iron content and increase the hydrochloric acid concentration, wherein the final iron content is 16 to 23 weight percent and the free hydrochloric acid concentration is 11 to 17 weight percent, and wherein the ferric chloride solution resulting from step b) is a stable solution and/or reversibly freezes at −10° C.
A process for forming a stable ferric chloride solution, the process comprising:
- mixing an iron material with liquid hydrochloric acid and gaseous hydrochloric acid to form a ferric chloride solution with an iron content of about 16 to about 23 weight percent and a hydrochloric acid content of about 11 to about 17 weight percent, wherein the ferric chloride solution is a stable solution and/or reversibly freezes at temperatures greater than −10° C.
A process for reconstituting an aqueous ferric chloride solution having an iron content of about 16 to about 23 weight percent and a hydrochloric acid concentration of about 11 to about 17 weight percent, comprising:
- diluting the aqueous ferric chloride solution to reduce the iron content;
- mixing the dilute aqueous ferric chloride solution with a ferrous ion containing pickling liquor to form a mixture;
- and
- oxidizing the mixture to form a ferric chloride solution having less than 5 percent by weight hydrochloric acid concentration and about 10 to about 14 weight percent ferric iron content.
A process for reconstituting an aqueous ferric chloride solution having an iron content of about 16 to about 23 weight percent and a hydrochloric acid concentration of about 11 to about 17 weight percent, comprising:
- diluting the ferric chloride solution to reduce the iron content;
- and
- adding an iron containing material to the dilute ferric chloride solution in an amount effective to decrease the hydrochloric acid concentration to less than 5 percent by weight of the ferric chloride solution and increase the ferric iron content to about 10 to about 14 weight percent.
A process for reconstituting an aqueous ferric chloride solution having an iron content of about 16 to about 23 weight percent and the hydrochloric acid concentration of about 11 to about 17 weight percent, comprising:
- evaporating HCI from the ferric chloride solution to concomitantly reduce the HCI concentration and increase the iron content in the ferric chloride solution;
- and
- diluting the evaporated ferric chloride solution to decrease the iron content to about 10 to about 14 weight percent and the hydrochloric acid to less than 2 weight percent.
A process for forming a stable ferric chloride solution, the process comprising:
- mixing an iron material with ferrous and/or ferric chloride solution and gaseous hydrochloric acid to form a ferrous and/or ferric chloride solution with an iron content of about 16 to about 23 weight percent and a hydrochloric acid content of about 11 to about 17 weight percent, wherein the ferric chloride solution is a stable solution and/or reversibly freezes at temperatures greater than −10° C.
Dependencies are inferred from the claim text.