Enthalpy of formation of bis(2-fluoro-2,2-dinitroethyl)amine

Abstract

The enthalpy of formation of bis(2-fluoro-2,2-dinitroethyl)amine was determined by combustion calorimetry using a platinum-lined rotating-bomb calorimeter. To desensitize and ensure complete combustion, the compound was burned with an auxiliary material, diethylphthalate. The enthalpy of formation (c,298.15°K) was determined to be -126.952 ± 0.49 kcal/mol.The enthalpy of formation of bis(2-fluoro-2,2-dinitroethy])amine (BFDNA) was determined by combustion calorimetry, using a platinum-lined rotating-bomb calorimeter. A mixture of approximately 55/45 wt % of BFDNA to diethylphthalate (DEP) was burned in an oxygen atmosphere (30 atm pressure). After a series of preliminary runs on a Parr stationary adiabatic-bomb calorimeter, this ratio was selected to produce a smooth and clean combustion. Since BFDNA was considered shock sensitive, the DEP also served as a desensitizer. The enthalpy of formation (d, 298.15°K) was determined from the following idealized equation at 1 atm: C4H508N5F2(c) + 0.75 02(g) + 118.5 H20(1) -4 C02(g) + 2 HF 60 H20(1) + 2.5 N2(g) EXPERIMENTAL Apparatus. The combustion experiments were carried out in a platinum-lined rotating-bomb calorimeter, built according to a design of the Bureau of Mines, Bartlesville, Okla. ( 7). The modifications to the original instrumentation, and the basic procedure were as previously reported (16)