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Direct nitrolysis of 3,7-dinitro-1,3,5,7-tetraazabicyclo[3,3,1]nonane (DPT) is a feasible way to synthesize HMX, and it has multiple practical applications. In this paper, a new nitrolysis process involving the use of an N2O5-HNO3 system catalyzed by acidic ionic liquids (AILs) was developed. The results show that [Et3NH]TsO was the best catalyst among the 28 AILs used and that HMX was formed at a higher yield of 61%, compared to 45% without any AIL. Moreover, with the addition of N2O5, the yield was further increased to a maximum value of 69%. The AILs were also efficiently recovered by simple extractions without any apparent loss of catalytic activity, even after five runs.

Preparation of HMX by Catalytic Nitrolysis of DPT in AIL-N2O5-HNO3System

Preparation of HMX by Catalytic Nitrolysis of DPT in AIL-N₂O₅-HNO₃System