Method for producing borazane

A process for obtaining borazane (NH3—BH3), comprising:

• providing a reactor, equipped with a stirring system and thermostatically regulated at a temperature between a temperature θ1 and 40° C.;
• introducing anhydrous liquid ammonia (NH3(l)) into said reactor;
• introducing, with stirring, into said reactor containing anhydrous liquid ammonia (NH3(l)), an amine borane complex of formula Am.BH3 to obtain a mixture, amine Am of said complex of formula Am.BH3 being soluble in anhydrous liquid ammonia only to a proportion of less than 10 g in 100 g of anhydrous liquid ammonia at 20° C., said amine borane complex of formula Am.BH3 being introduced in an amount such that the mole ratio R=anhydrous liquid ammonia (NH3(l))/amine borane complex of formula Am.BH3 is greater than or equal to 5;
• stirring the mixture to a point of depletion of said amine borane complex of formula Am.BH3;
• stopping the stirring and obtaining, in said reactor, two demixed phases:
• a light phase constituted essentially of a solution of anhydrous liquid ammonia (NH3(l)) containing borazane;
• and
• a heavy phase constituted essentially of the amine Am corresponding to the amine borane complex of formula Am.BH3 introduced;
• isolating said borazane and drying under vacuum thereof;
• said temperature θ1 being greater than or equal to the melting point of said amine borane complex of formula Am.BH3.