METHOD FOR PRODUCING HEXAFLUORO-ALUMINUM AMMONIUM

摘要

PROBLEM TO BE SOLVED: To provide a method for producing hexafluoro-aluminum ammonium used as starting material for producing nitrogen trifluoride. SOLUTION: Hydrofluoric acid and ammonia are simultaneously added to tetrafluoro-aluminum ammonium containing hexafluoro-aluminum ammonium and seed crystals, and they are reacted with each other. The seed crystals are added particularly in an amount 2-200 times (weight) the amount of the hexafluoro-aluminum ammonium contained in the tetrafluoro-aluminum ammonium.