Method for producing potassium borohydride

Abstract

This invention relates to a simple method for manufacturing potassium borohydride. The method comprises the following reaction steps: mixing a solid raw material containing an alkali metal compound, a fluoride, and at least one material selected from aluminum compounds and aluminum, and then heating the mixture at a temperature above 560°C.

Claims

1. A method for manufacturing potassium borohydride, comprising the following reaction steps: mixing a solid raw material containing an alkali metal compound, a fluoride, and at least one material selected from aluminum compounds and aluminum, and heating the mixture at a temperature higher than 560°C.

2. The method for manufacturing potassium borohydride as described in claim 1, wherein, Prior to the aforementioned reaction step, there is a pretreatment step, which involves mixing the aforementioned material selected from at least one of aluminum compounds and aluminum with the aforementioned fluoride.

3. The method for manufacturing potassium borohydride as described in claim 2, wherein, The aforementioned pretreatment steps are performed at temperatures between 100°C and 330°C.

4. A method for manufacturing potassium borohydride as described in any one of claims 1 to 3, wherein, The aforementioned reaction steps were carried out in a hydrogen atmosphere.

5. A method for manufacturing potassium borohydride as described in any one of claims 1 to 3, wherein, The aforementioned alkali metal compounds are selected from at least one of potassium aluminate (KAlO2), potassium borate, potassium hydride (KH), potassium borohydride (KBH4), and potassium oxide (K2O).

6. The method for manufacturing potassium borohydride as described in claim 5, wherein, The aforementioned potassium borates are selected from at least one of potassium metaborate (KBO2), potassium tetraborate (K2B4O7), and potassium diborate (K4B2O5).

7. A method for manufacturing potassium borohydride as described in any one of claims 1 to 3, wherein, The aforementioned fluoride is selected from at least one of sodium fluoride (NaF), sodium hexafluoroaluminate (Na3AlF6), potassium fluoride (KF), potassium tetrafluoroaluminate (KAlF4), potassium hexafluoroaluminate (K3AlF6), aluminum fluoride (AlF3), and lithium fluoride (LiF).

8. A method for manufacturing potassium borohydride as described in any one of claims 1 to 3, wherein, The aforementioned aluminum compound is selected from at least one of sodium aluminate (NaAlO2), potassium aluminate (KAlO2), aluminum oxide (Al2O3), aluminum hydroxide (Al(OH)3), and aluminum fluoride (AlF3).

9. A method for manufacturing potassium borohydride as described in any one of claims 1 to 3, wherein, The molar ratio of aluminum in the aforementioned solid raw material is more than 4 / 3 relative to the boron content.

10. A method for manufacturing potassium borohydride as described in any one of claims 1 to 3, wherein, The aforementioned solid raw material further contains at least one of alkali metal oxides and alkaline earth metal oxides, and the molar ratio of the total alkali metal and alkaline earth metal contained in the aforementioned solid raw material to the boron contained in the aforementioned solid raw material is more than 1.0 and less than 1.3.

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