PROCESSES FOR FORMING TITANIUM CATECHOL COMPLEXES
First Claim
1. A method comprising:
- forming a catechol solution comprising a catechol compound and an organic solvent;
heating the catechol solution;
adding titanium tetrachloride to the catechol solution to form a reaction mixture;
reacting the titanium tetrachloride with the catechol compound to evolve HCl gas from the reaction mixture and to form an intermediate titanium catechol complex; and
adding an alkaline aqueous solution to the intermediate titanium catechol complex, the alkaline aqueous solution comprising an alkali metal base;
wherein the alkali metal base converts the intermediate titanium catechol complex into an alkali metal salt form titanium catechol complex that is at least partially dissolved in an aqueous phase.
2 Assignments
0 Petitions
Accused Products
Abstract
Titanium complexes containing catecholate ligands can be desirable active materials for flow batteries and other electrochemical energy storage systems. Such complexes can be formed, potentially on very large scales, through reacting a catechol compound in an organic solvent with titanium tetrachloride, and then obtaining an aqueous phase containing an alkali metal salt form of the titanium catechol complex. More specifically, the methods can include: forming a catechol solution and heating, adding titanium tetrachloride to the catechol solution, reacting the titanium tetrachloride with a catechol compound to evolve HCl gas and to form an intermediate titanium catechol complex, and adding an alkaline aqueous solution to the intermediate titanium catechol complex to form an alkali metal salt form titanium catechol complex that is at least partially dissolved in an aqueous phase. The aqueous phase can be separated from an organic phase. The resulting complexes can be substantially free of alkali metal halide salts.
5 Citations
27 Claims
-
1. A method comprising:
-
forming a catechol solution comprising a catechol compound and an organic solvent; heating the catechol solution; adding titanium tetrachloride to the catechol solution to form a reaction mixture; reacting the titanium tetrachloride with the catechol compound to evolve HCl gas from the reaction mixture and to form an intermediate titanium catechol complex; and adding an alkaline aqueous solution to the intermediate titanium catechol complex, the alkaline aqueous solution comprising an alkali metal base; wherein the alkali metal base converts the intermediate titanium catechol complex into an alkali metal 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. A method comprising:
-
providing a catechol solution comprising a catechol compound and an organic solvent, the organic solvent being water-immiscible; while heating the catechol solution, adding titanium tetrachloride thereto to evolve HCl gas and to form a reaction mixture comprising an intermediate titanium catechol complex; wherein the intermediate titanium catechol complex is insoluble in the reaction mixture; without isolating the intermediate titanium catechol complex from the reaction mixture, adding an alkaline aqueous solution to the intermediate titanium catechol complex; wherein the alkaline aqueous solution comprises an alkali metal base; reacting the alkali metal base with the intermediate titanium catechol complex to form an alkali metal salt form titanium catechol complex that is at least partially dissolved in an aqueous phase; and separating the aqueous phase and an organic phase from one another. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
-
-
26. A composition comprising:
-
an aqueous phase; and an alkali metal salt form titanium catechol complex dissolved in the aqueous phase; wherein the composition comprises about 0.01 molar equivalents or less of alkali metal halide salts relative to the alkali metal salt form titanium catechol complex. - View Dependent Claims (27)
-
Specification