A method for preparing sodium tetrafluoroborate

By using the addition polymerization reaction of modified polytetrafluoroethylene membrane filter elements with specific compounds, the problems of low purity and complex reaction of sodium tetrafluoroborate have been solved, realizing the preparation of high-purity, low-cost and environmentally friendly sodium tetrafluoroborate, which is suitable for sodium-ion battery electrolytes.

CN116588944BActive Publication Date: 2025-11-21QUZHOU JIUZHOU CHEM IND CO LTD
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Patent Information

Application Number
CN202310591764.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-05-24
Publication Date
2025-11-21
Estimated Expiration
2043-05-24

AI Technical Summary

Technical Problem

In existing technologies, sodium tetrafluoroborate has poor purity, long reaction time, complex reaction process and high energy consumption, which makes it difficult to meet the high performance requirements of sodium-ion batteries.

Method used

High-purity sodium tetrafluoroborate was prepared by using a modified polytetrafluoroethylene (PTFE) membrane filter element to perform an addition polymerization reaction with vinylguanidine, sodium acrylate, and 1-allyl-3-ethylimidazolium tetrafluoroborate. The modified PTFE membrane filter element was used to improve the purity of sodium tetrafluoroborate and simplify the reaction process.

Benefits of technology

This method improves the purity of sodium tetrafluoroborate, reduces costs, simplifies the process, reduces energy consumption, and achieves a low-toxicity and environmentally friendly preparation process.

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Abstract

The present application relates to the field of fine chemical industry, and particularly to a preparation method of sodium tetrafluoroborate; the present application uses hydrofluoric acid, boric acid and soda to prepare sodium tetrafluoroborate; the present application uses evaporation, polar organic solvent dissolution, separation, modified polytetrafluoroethylene membrane fine filter filtration, cooling crystallization and the like to purify sodium tetrafluoroborate; the present application uses a polytetrafluoroethylene membrane filter core, vinyl guanidine, sodium acrylate, 1-allyl-3-ethyl imidazole tetrafluoroborate, an initiator and deionized water to prepare a modified polytetrafluoroethylene membrane filter core; the modified polytetrafluoroethylene membrane filter core prepared by the present application can effectively improve the purity of sodium tetrafluoroborate; the present application has the characteristics of low cost, simple process, low toxicity and environmental friendliness; the present application has mild reaction conditions in the preparation process, is easy to operate, has low energy consumption and high product purity.
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