Neat Synthesis of Titanium Catecholate Complexes
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Solution Overview
Problem
Current methods for synthesizing titanium catecholate complexes are not viable for commercial-scale energy storage applications due to issues with residual solvents, solubility, and extraneous salt formation, which affect the performance and efficiency of flow batteries.
Innovation Solution
A method involving the direct combination of a catechol compound and a titanium reagent in a solvent-free state to form titanium catecholate complexes, followed by separation of byproduct species and conversion to a salt form using a base, resulting in a product that is substantially free of organic solvents and extraneous salts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional synthesis methods using solvents are employed to produce titanium catecholate complexes, then the synthesis process can proceed smoothly with good reaction rates, but residual organic solvents remain in the product which causes membrane swelling in flow batteries and compromises operational reliability
Solution Approach 1:
The patent applies the extraction principle by removing the harmful organic solvent component from the synthesis system entirely. The neat synthesis method extracts the solvent from the reaction mixture, allowing the reaction to proceed without any organic solvent present. This eliminates the source of residual solvent contamination that would otherwise swell membranes and compromise flow battery reliability.
Solution Approach 2:
The patent changes the physical state parameter of the reaction system from a solution-based system to a neat (solvent-free) system. By changing the solvent parameter from present to absent, the method eliminates residual solvent contamination while maintaining reaction effectiveness through the use of reactants in their pure liquid or melted states.
2Ease of manufacture
If conventional synthesis methods are used to produce titanium catecholate complexes, then the synthesis can be completed with standard procedures, but extraneous salts form as byproducts which decrease the solubility of the complex through the common ion effect
Solution Approach 1:
The patent extracts and removes extraneous salt byproducts from the reaction system through filtration and purification steps. By taking out these harmful salt contaminants, the method prevents the common ion effect that would otherwise decrease the solubility of the titanium catecholate complex in the electrolyte solution.
Solution Approach 2:
The patent changes the purity parameter of the final product by implementing a refined synthesis and purification protocol. This parameter change ensures the complex is substantially free of extraneous salts, thereby maximizing solubility in the electrolyte solution without requiring complexing agents or chelators.
3Reliability
If neat synthesis methods are employed to produce titanium catecholate complexes free of solvents and salts, then the purity and solubility of the complex improve for flow battery applications, but the synthesis process becomes more complex requiring precise control of reaction conditions
Solution Approach 1:
The patent applies preliminary action by pre-mixing the titanium reagent and catechol compound in precise stoichiometric ratios before initiating the reaction. This preliminary preparation ensures that the reaction proceeds cleanly without forming extraneous salts, simplifying subsequent purification steps while maintaining high product purity suitable for flow battery applications.
Solution Approach 2:
The patent maintains continuity of useful action by conducting the synthesis as a continuous neat reaction process without interruption for solvent removal or intermediate purification. The reaction proceeds continuously in the neat state, and only after completion are the products separated and purified, thereby maintaining process efficiency while achieving high purity results.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the production of high-purity titanium catecholate complexes with improved solubility and reduced environmental impact, suitable for large-scale energy storage applications, enhancing the efficiency and performance of flow batteries.
Implementation Method 1
reacting the titanium reagent with the catechol compound in a neat state to form a titanium catecholate complex containing at least one catecholate ligand
Implementation Method 2
separating a byproduct species including a hydrogen halide gas from the titanium catecholate complex
Implementation Method 3
reacting a base with the titanium catecholate complex to produce a salt form titanium catecholate complex
Data Source
AI summary
Titanium catecholate complexes can be desirable active materials for flow batteries and other electrochemical energy storage systems, particularly when incorporated in aqueous electrolyte solutions. It can be desirable to avoid introducing even traces of certain organic solvents into aqueous electrolyte solutions. Neat methods for synthesizing titanium catecholate complexes can help avoid the unwanted introduction of trace organic solvents into aqueous electrolyte solutions and also provide further advantages. Methods for synthesizing titanium catecholate complexes can include: combining a catechol compound and a titanium reagent in an absence of solvent to produce a reaction mixture, and reacting the titanium reagent with the catechol compound in a neat state to form a titanium catecholate complex containing at least one catecholate ligand. The titanium catecholate complex can be further reacted with a base to produce a salt form titanium catecholate complex, which can be present in an aqueous phase.