Processes for synthesizing alkali metal borohydride compounds
First Claim
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1. A process for producing borohydride compounds, wherein the process comprises reacting a borane complex in a solution comprising a non-aqueous aprotic solvent or a non-aqueous polar solvent with a base, thereby providing a borohydride compound of formula YBH4, wherein Y is a monovalent cationic moiety and the base is selected from the group consisting of a hydroxide of formula YOH and a carbonate of formula Y2CO3.
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Abstract
Processes for synthesizing borohydride compounds with reduced energy requirements and high efficiency are disclosed. The processes include the reaction of a base with a borane complex or diborane to produce a borohydride compound of formula YBH4, where Y is a monovalent cationic moiety.
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12 Claims
- 1. A process for producing borohydride compounds, wherein the process comprises reacting a borane complex in a solution comprising a non-aqueous aprotic solvent or a non-aqueous polar solvent with a base, thereby providing a borohydride compound of formula YBH4, wherein Y is a monovalent cationic moiety and the base is selected from the group consisting of a hydroxide of formula YOH and a carbonate of formula Y2CO3.
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10. A process for producing borohydride compounds, comprising,
(a) reacting gaseous diborane with a carbonate of formula Y2CO3 in the solid phase the absence of solvent, thereby providing a borohydride of formula YBH4, a borate of formula YBO2, and unreacted solid carbonate, where Y is sodium; -
(b) isolating the borohydride;
(c) adding an alcohol, wherein the borate is substantially soluble in the alcohol and the unreacted solid sodium carbonate is substantially insoluble in the alcohol; and
(d) isolating the unreacted sodium solid carbonate.
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11. A process for producing borohydride compounds, comprising:
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(a) reacting gaseous diborane with a carbonate of formula Y2CO3 suspended in a non-aqueous aprotic solvent or a non-aqueous polar solvent, thereby providing a borohydride of formula YBH4, a borate of formula YBO2, and unreacted solid carbonate, where Y is sodium;
(b) isolating the borohydride;
(c) adding an alcohol, wherein the borate is substantially soluble in the alcohol and the unreacted solid sodium carbonate is substantially insoluble in the alcohol; and
(d) isolating the unreacted solid sodium carbonate.
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12. A process for producing borohydride compounds, comprising:
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(a) reacting a borane complex in a solution comprising a non-aqueous polar solvent with a carbonate of formula Y2CO3 suspended therein, thereby providing a borohydride of formula YBH4, a borate of formula YBO2, and unreacted solid carbonate, where Y is sodium;
(b) isolating the borohydride;
(c) adding an alcohol to the borate and the unreacted solid carbonate, wherein the borate is substantially soluble in the alcohol and the unreacted solid sodium carbonate is substantially insoluble in the alcohol; and
(d) isolating the unreacted solid sodium carbonate.
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Specification