PROCESS FOR THE PREPARATION OF SODIUM BOROHYDRIDE FROM HYDROGEN RECYCLING OF SODIUM METABORATE

摘要

Preparation of borohydrides (I) comprises: reacting metaborate (II) with alcohol (III) to form alcoholate (IV), trialkyl borate (V) and water; and reduction of trialkyl borate (V) by a hydride (VI). Preparation of borohydrides (I) of formula Z (BH4) comprises: reacting metaborate (II) of formula Z (BO2) with an alcohol (III) of formula (ROH) to form an alcoholate (IV) and trialkyl borate (V) of formulae (ZOR) and B(OR3) respectively, and water; and reduction of (V) by a hydride (VI) of formula (ZH). Z : monovalent cation derived from an alkaline metal having metaborate (II) of formula Z (BO2); and R : 1-4C alkyl. An independent claim is also included for the regeneration of sodium borohydride (Ia) of formula (NaBH4), from sodium metaborate (IIa) of formula (NaBO2) along with hydrogen (which is stored in the form of sodium borohydride) by hydrolysis.