Process for the preparation of 1,2,4-triazole comprises contacting hydrazine or its aqueous solutions with at least about 2.5 moles of formamide at a temperature of 140° to 210° C. and then recovering the resultant 1,2,4- triazole in yields of 92-98% with 94-98% purity. The formamide is maintained in an excess over about the 2.5 molar amount consumed in the reaction with the hydrazine. Recovery steps for isolating the 1,2,4-triazole are disclosed.
Copyright © 1981 United States Patent and Trademark Office.
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Petree, Harris E., Joseph R. Pociask, and John T. Gupton. Method for Direct Preparation for 1,2,4-Triazole from Hydrazine and Formamide. US Patent 4267347, filed November 7, 1979, and issued March 12, 1981.