3,7-Dinitro-1,3,5,7-tetrazabicyclo-[3,3,1]nonane (DPT) is a key intermediate in the preparation of octahydro-1,3,5,7-tetranitro 1,3,5,7-tetrazocine (HMX), one of the most powerful high-melting explosives. The present investigation focuses on DPT formation during semi-batch and continuous processes. Qualitative and quantitative picture has been brought out to realize the role of DPT in HMX formation. The study reveals that only two thirds of DPT is formed in the continuous process as compared to that of semi-batch process. The calculated final yield of HMX on reaching steady state in the continuous process is comparable to the semi-batch process. This study also illustrates the usefulness in understanding the role of DPT in the final yield of HMX.