Synthesis of cyclotetramethylene tetranitramine through the action of nitrating mixture formed of ammonium nitrate and fuming nitric acid on hexamine in presence of acetic acid, acetic anhydride and p-formaldehyde has been proven. The pathway is relatively long and hexamine dinitrate and dinitro pentamethylene tetramine (DPT) are two of the main intermediate compounds. The former was prepared, purified, and then characterized. Conversion of this compound into the latter has been followed up experimentally. Different kinetic models have been tested.
Elazab, Hany A., "Coversion of Hexamine Dinitrate into Dinitro Pentamethylene Tetramine: Follow-UP and Kinetic Model Selection" (2006). Chemical Engineering. 112.