Patent ID: 8133288
Filing Date: 2012-03-13
Classification: C01B,C01D,Y02E

Abstract:
1. A process for preparing an alkaline aqueous borohydride composition, the process comprising: mixing a feedstock of a dilute alkaline aqueous solution of sodium borohydride with a polar, non-aqueous solvent that is a better solvent for the sodium borohydride than for the base; extracting sodium borohydride from the alkaline aqueous solution into the non-aqueous phase; separating the non-aqueous solution of sodium borohydride from the aqueous phase; concentrating the initial non-aqueous solution of sodium borohydride to provide a predefined concentration of sodium borohydride by evaporating the non-aqueous solvent; adding a predefined amount of an alkaline stabilizing agent to the concentrated non-aqueous solution of sodium borohydride to provide a product, the product including residual non-aqueous solvent; and separating the residual non-aqueous solvent from the product to provide a concentrated product.