Japan Hydrazine Co., Ltd.

Masuda Chemical Industry Co., Ltd.

Masuda Chemical Industries Co., Ltd.

Kohki Satoh

Shunji Hyoda

Masaharu Kita

Hirotoshi Sawada

Shuichi Nemugaki

Takahiro Ueta

Sumio Otsuka

Yoshitaka Miyawaki

Hiroshi Taniguchi

A process for preparing 5,5'-bi-1H-tetrazolediammonium salts (BHT.2NH) maintaining a high yield through oxaldiimidic acid dihydrazide (OAH) from the starting materials which are cheaply available and are easy to handle. The 5,5&#x2032;-bi-1H-tetrazolediammonium salts (BHT.2NH) are prepared by dissolving the oxaldiimidic acid dihydrazide (OAH) obtained by the reaction of hydrated hydrazide with dicyan in an aqueous solution of a weakly acidic compound such as acetic acid, dropwisely adding an aqueous solution of sodium nitrite thereto to form an azide thereof and to effect the cyclization reaction by heating, adding an aqueous solution of sodium hydroxide to the reaction product to convert it into a 5,5&#x2032;-bi-1H-tetrazoledisodium salt (BHT.2Na), reacting it with an aqueous solution of ammonium chloride, and recovering the formed ammonium salt as sparingly soluble crystals.

Process for the preparation of 5,5'-bi-1H-tetrazolediammonium salts using hydrazine hydrate and dicyan as starting materials

A process for the preparation of a 5,5'-bi-1H-tetrazole diammonium salt by dropwisely adding the aqueous hydrogen peroxide to which a small amount of weakly acidic substance has been added, to a starting aqueous solution containing hydrogen cyanide or sodium cyanide or potassium cyanide, sodium azide and a catalytic amount of copper sulfate preferably at a low temperature to maintain the pH of the reaction solution over a range of from 5 to 6, heating the reaction solution to effect the oxidation and cyclization reaction, reacting the reaction product with ammonium chloride or an aqueous solution thereof, and recovering the formed ammonium salt in the form of sparingly soluble crystals. The desired product is obtained in a high yield and in a high purity from the starting materials which are cheaply available and are easy to handle through a decreased number of steps, i.e., through a one-pot reaction without requiring cumbersome after-treatment.

Process for the preparation of 5,5'-bi-1H-tetrazole salt

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Sakaide, Japan

Kohki Satoh