Process for the preparation of highly pure 5,5' -bi-1H-tetrazolediammonium salts

摘要

A process for the preparation of a highly pure 5,5'-bi-1H-tetrazolediammonium salt comprising adding a small amount of ammonia water to a reaction solution containing a 5,5'-bi-1H-tetrazolediammonium salt synthesized in the presence of a copper catalyst, removing by filtration the blue insoluble components of formed copper.ammonia.5,5'-bi-1H-tetrazole complex to obtain a filtrate of the 5,5'-bi-1H-tetrazoledisodium salt and reacting the filtrate with an aqueous solution of ammonium chloride, and recovering the formed, highly pure ammonium salt as sparingly soluble crystals.