Purification and use of ferrocyanide solutions
View Patent ↗A system and method for efficiently purifying a starting material for a TMCC final product as well as a system and method for efficiently producing high quality TMCC material using the purified starting material.
1. A method for manufacturing a transition metal coordination compound (TMCC) material having well faceted cubic crystal grains and possessing a crystallite aggregate size of greater than 10 microns, comprising:
a) reacting an aqueous solution including a ferrocyanide salt and a first quantity of a reducing agent with a first quantity of an oxidizing agent to produce a purified aqueous solution having a second quantity of said reducing agent less than said first quantity; and
b) reacting said purified aqueous solution with an aqueous solution including a set of salts of a transition metal to produce the TMCC material.
2. The method of claim 1 wherein said first quantity of said oxidizing agent is in a range of 10 ppm to 1000 ppm.
3. The method of claim 1 wherein said purified aqueous solution includes a second quantity of said oxidizing agent less than said first quantity of said oxidizing agent.
4. The method of claim 3 wherein said purified aqueous solution includes a reduced oxidizing agent.
5. The method of claim 4 wherein said oxidizing agent includes a first class oxidizing agent wherein said reduced oxidizing agent includes said ferrocyanide salt.
6. The method of claim 5 wherein said first class oxidizing agent includes one or more materials selected from the group consisting of potassium ferricyanide, sodium ferricyanide, and combinations thereof.
7. The method of claim 4 wherein said oxidizing agent includes a second class oxidizing agent wherein said reduced oxidizing agent includes a material that dissipates from said purified aqueous solution prior to said reacting step b.
8. The method of claim 4 wherein said oxidizing agent includes a third class oxidizing agent wherein said reduced oxidizing agent includes a material that is generally inert in said reacting step b.
9. The method of claim 4 wherein said oxidizing agent includes a fourth class oxidizing agent wherein said reduced oxidizing agent includes a particular quantity of a material that degrades said reacting step b less than said particular quantity of said reducing agent degrades said reacting step b.
10. The method of claim 1 wherein said aqueous solution includes a pH in a range of 3-12.
11. The method of claim 1 wherein said purified aqueous solution includes a pH in a range of 3-12.
12. The method of claim 1 wherein both said aqueous solution and said purified aqueous solution includes a pH in a range of 3-12.
13. The method of claim 1 wherein said oxidizing agent includes one or more materials selected from the group consisting of hexacyanometallates such as sodium ferricyanide, potassium ferricyanide, and combinations thereof.
14. The method of claim 1 wherein said oxidizing agent includes one or more materials selected from the group consisting of non-metallic mineral oxidants producing one or more of hypervalent iodine compounds, perchlorates, peroxides, peroxy acids, and combinations thereof.
15. A method for manufacturing a transition metal coordination compound (TMCC) material having well faceted cubic crystal grains and possessing a crystallite aggregate size of greater than 10 microns, comprising:
a) reacting an aqueous solution including a ferrocyanide salt and a first quantity of a reducing agent with a first quantity of an oxidizing agent to produce a purified aqueous solution having a second quantity of said reducing agent less than said first quantity; and
b) reacting said purified aqueous solution with an aqueous solution including a set of salts of a transition metal to produce the TMCC material;
wherein said oxidizing agent includes one or more materials selected from the group consisting of sulfur containing compounds such as sulfur trioxide.