Preparation of PCDE
Final rept. 18 Dec 1974-31 Jan 1976
ROCKWELL INTERNATIONAL CANOGA PARK CA ROCKETDYNE DIV
Pagination or Media Count:
Alternate processes for preparing PCDE, poly 1-cyano, 1-difluoramino ethylene oxide, have been explored. Difluoramination of DEPECH, poly-2,3 epoxy propane, in heterogeneous gas-liquid reactions near atmospheric pressure have been studied as possible alternatives to the homogeneous high-pressure 400 psig reaction in acetone solvent currently used for the manufacture of PBEP the PCDE precursor. Other solvents and mixed solvents have been tested as reaction media. Difluoramine generation by hydrolysis of difluorosulfamic acid was studied. Difluoramination does occur using the alternative processes, but addition of the NF2 is less than half the theoretical amount. No solvent reaction media was found that could dissolve both DEPECH and tetrafluorohydrazine in sufficient concentrations to drive the reaction to completion at near atmospheric pressures. Reactions have been conducted in vented continuous flow apparatus as well as in a closed reaction vessel, and have been followed using infrared spectroscopy, gas-liquid chromatography and elemental analyses.
- Organic Chemistry
- Rocket Propellants