Accession Number : ADD014281

Title :   Synthesis of Tetrafluorohydrazine.

Descriptive Note : Patent, Filed 7 Sep 88, patented 23 May 89,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Palmer, Miles R

Report Date : 23 May 1989

Pagination or Media Count : 4

Abstract : High purity tetrafluorohydrazine is synthesized by reacting Nitrogen Trifluoride with silicon at an elevated temperature. The reaction occurs only periodically and at a low concentration of NF3. Immediate cooling of the reaction material produces tetrafluorohydrazine and Silicon tetrafluoride. Alkaline hydrolysis removes substantially all impurities. Tetrafluorohydrazine is further recovered by cryogenic trapping from the remaining impurities. Tetrafluorohydrazine is useful as a high energy oxidizer as a rocket propellant. For example, when it reacts with hydrazine a specific impulse of about 300 is possible. This value may be compared with those for reaction of oxygen and hydrazine, for which the calculated specific impulse is 273 sec. and the flame temperature is 3000 K. It will be seen that tetrafluorohydrazine provides almost as high a specific impulse, but it differs from oxygen in being storable in liquid condition at normal temperatures, while liquid oxygen requires low temperatures which bring many problems. Tetrafluorohydrazine can also be reacted with ammonia to provide a source of high energy and high impulse. Thus, tetrafluorohydrazine may be stored in missiles which are ready for immediate launching. The present invention is directed at a single step process that produces tetrafluorohydrazine without these undesirable characteristics. Keywords: Patents. (aw)

Descriptors :   *HYDRAZINES, *LIQUID ROCKET OXIDIZERS, *PATENTS, *LIQUID ROCKET PROPELLANTS, ALKALINITY, AMMONIA, COOLING, FLAMES, FLUORIDES, HIGH ENERGY, HIGH RATE, HIGH TEMPERATURE, HYDRAZINE DERIVATIVES, HYDROLYSIS, IMPURITIES, LAUNCHING, LIQUID OXYGEN, LOW TEMPERATURE, NITROGEN COMPOUNDS, PULSES, PURITY, SILICON, SOURCES, SPECIFIC IMPULSE, SYNTHESIS(CHEMISTRY), TEMPERATURE

Subject Categories : Liquid Rocket Propellants
      Industrial Chemistry and Chemical Processing

Distribution Statement : APPROVED FOR PUBLIC RELEASE