How to prepare 3-Amino-1,2,4-Triazole?

3-Amino-1,2,4-triazole is synthesised by reacting amino-guanidine carbonate with formic acid. The specific synthesis method is as follows: Weigh 136 g (1 mol) of amino guanidine carbonate fine powder and 48 g (40 mL, 1.05 mol) of 98–100% formic acid into a 500 mL double-neck round-bottom flask equipped with a thermometer. Carefully heat the bubbling mixture while gently rotating the flask to avoid local overheating until gas release stops and the entire mixture is completely dissolved. Keep the aminoguanidine formate solution at a temperature of 120°C for 5 hours. After the solution has cooled, add 500 ml of 95% ethanol, heat to dissolve the product, and then filter the solution while hot. Evaporate the ethanol solution to dryness in a steam bath and dry at 100°C to obtain the product. 3-Amino-1,2,4-triazole can be recrystallised from ethanol.

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