PROCESSES FOR FORMING TITANIUM CATECHOL COMPLEXES
First Claim
1. A method comprising:
- forming a catechol solution comprising a catechol compound and an organic solvent;
contacting a titanium reagent with the catechol solution to form a reaction mixture;
reacting the titanium reagent with the catechol compound to form an intermediate titanium catechol complex and a byproduct species;
separating the byproduct species from the intermediate titanium catechol complex; and
combining an alkaline aqueous solution with the intermediate titanium catechol complex, the alkaline aqueous solution comprising a base;
wherein the base converts the intermediate titanium catechol complex into a salt form titanium catechol complex that is at least partially dissolved in an aqueous phase.
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Abstract
Titanium complexes containing at least one catecholate ligand can be desirable active materials for flow batteries and other electrochemical energy storage systems. Such complexes can be formed through reacting a catechol compound with a titanium reagent in an organic solvent, removing a byproduct species, and then obtaining an aqueous phase containing a salt form of the titanium catechol complex, particularly an alkali metal salt form. More specifically, the methods can include: forming a catechol solution containing a catechol compound and an organic solvent, contacting a titanium reagent with the catechol solution to form a reaction mixture, reacting the titanium reagent with the catechol compound to form an intermediate titanium catechol complex and a byproduct species, separating the byproduct species, and combining an alkaline aqueous solution containing a base with the intermediate titanium catechol complex to produce a salt form titanium catechol complex at least partially dissolved in an aqueous phase.
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Citations
23 Claims
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1. A method comprising:
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forming a catechol solution comprising a catechol compound and an organic solvent; contacting a titanium reagent with the catechol solution to form a reaction mixture; reacting the titanium reagent with the catechol compound to form an intermediate titanium catechol complex and a byproduct species; separating the byproduct species from the intermediate titanium catechol complex; and combining an alkaline aqueous solution with the intermediate titanium catechol complex, the alkaline aqueous solution comprising a base; wherein the base converts the intermediate titanium catechol complex into a salt form titanium catechol complex that is at least partially dissolved in an aqueous phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method comprising:
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forming a catechol solution comprising a catechol compound and an organic solvent; contacting a titanium alkoxide with the catechol solution to form a reaction mixture; reacting the titanium alkoxide with the catechol compound to form an intermediate titanium catechol complex and an alcohol; and without separating the intermediate titanium catechol complex from the alcohol, combining an alkaline aqueous solution with the intermediate titanium catechol complex, the alkaline aqueous solution comprising a base; wherein the base converts the intermediate titanium catechol complex into a salt form titanium catechol complex that is at least partially dissolved in an aqueous phase further comprising the alcohol. - View Dependent Claims (23)
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Specification