The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 17, 2006
Filed:
Mar. 22, 2001
Shunji Hyoda, Sakaide, JP;
Masaharu Kita, Sakaide, JP;
Hirotoshi Sawada, Sakaide, JP;
Shuichi Nemugaki, Sakaide, JP;
Takahiro Ueta, Sakaide, JP;
Kohki Satoh, Sakaide, JP;
Shunji Hyoda, Sakaide, JP;
Masaharu Kita, Sakaide, JP;
Hirotoshi Sawada, Sakaide, JP;
Shuichi Nemugaki, Sakaide, JP;
Takahiro Ueta, Sakaide, JP;
Kohki Satoh, Sakaide, JP;
Japan Hydrazine Co., Ltd., Tokyo, JP;
Masuda Chemical Industries Co., Ltd., Kagawa-Ken, JP;
Abstract
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′-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′-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.