Borate By-Product Processing for Stable NaBH4 Regeneration
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Solution Overview
Problem
The regeneration of sodium borohydride from its by-product is challenging due to the instability and variability of the by-product formed during hydrolysis, which has not been adequately addressed in existing methods, hindering the closure of the NaBH4—H2 cycle.
Innovation Solution
A method involving sedimentation and vacuum drying of the borate by-product to obtain pure NaB(OH)4, followed by rehydrogenation, which stabilizes the by-product for efficient regeneration into sodium borohydride.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the borate by-product is extracted in an uncontrolled manner, then the extraction process is simple, but the by-product composition becomes unstable and contains various compounds
Solution Approach 1:
The patent applies parameter changes by controlling the pH of the aqueous solution within a specific range (5-9) to stabilize the borate by-product composition. By adjusting and maintaining the pH parameter, the method ensures that the borate remains in a stable form (primarily NaB(OH)4) during extraction, preventing the formation of various unstable compounds while keeping the extraction process straightforward.
2Ease of manufacture
If conventional dehydration methods are applied before rehydrogenation, then the borate can be processed, but the process time and cost increase
Solution Approach 1:
The patent applies preliminary action by controlling the pH during the extraction step to pre-stabilize the borate in the desired NaB(OH)4 form. This preliminary pH control eliminates the need for subsequent dehydration steps before rehydrogenation, as the borate is already in the optimal hydrated form for direct rehydrogenation processing, thereby reducing both time and cost.
Solution Approach 2:
The method changes the physical-chemical parameters of the borate by maintaining specific pH conditions (5-9) during extraction, which preserves the borate in a stable hydrated form (NaB(OH)4) that is directly suitable for rehydrogenation. This parameter control eliminates the need for time-consuming dehydration processes while ensuring the borate is in the optimal form for regeneration.
3Device complexity
If the by-product stability is not controlled, then the processing is simpler, but the regeneration efficiency decreases
Solution Approach 1:
The patent applies parameter changes by controlling the pH within a specific range (5-9) during extraction to stabilize the borate composition. This simple pH control parameter ensures that the borate remains primarily as NaB(OH)4, which has high regeneration efficiency through rehydrogenation, without adding significant complexity to the processing steps.
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 method achieves high-purity NaB(OH)4, reducing time and cost for rehydrogenation, optimizing the NaBH4—H2 system and enabling cost-effective on-demand hydrogen generation.
Implementation Method 1
separating the borate compound from the mixture by sedimentation
Implementation Method 2
drying the borate-rich supernatant under vacuum to obtain a solid composition
Data Source
AI summary
The present disclosure relates to a method for processing a liquid by-product of sodium borohydride hydrolysis to obtain a borate compound, the method comprising the following steps: separating the liquid by-product by sedimentation, to obtain a borate-rich supernatant; drying the borate-rich supernatant under vacuum to obtain a solid composition comprising a borate compound. An aspect of the present disclosure relates composition obtainable by the disclosed method comprising at least 90% (w/w) of sodium boron hydroxide and its use as a source of borate in the production of sodium borohydride and/or hydrogen.