A STUDY OF THE EXPLOSION LIMITS OF SIMPLE DIFLUORAMINO COMPOUNDS
ATLANTIC RESEARCH CORP ALEXANDRIA VA COMBUSTION AND PHYSICAL SCIENCE DEPT
Pagination or Media Count:
Vapors of bis-difluoroamino propanes C3H6NF22 DP and bisdifluoroamino butanes C4H7NF22 DB were exploded either by raising the temperature or by adding fluorine. For the thermally induced explosion the experiments yielded explosion limits as functions of pressure p, temperature T and vessel diameter d. For the fluorine-induced explosion the experiments yielded explosion limits in terms of critical fluorine concentrations F2crit. The data show prima facie that the reaction is of the branched-chain type and that at the explosion limits the relation Rate of Chain Branching Rate of Chain Breaking is applicable. Using this relation in conjunction with chemical analysis of the reaction products and auxiliary data from photochemical experiments, a reaction mechanism has been formulated for the DP isomers. The high sensitivity of the DB isomers to initiation of explosion by fluorine is the probable cause of premature reaction on admitting DB vapor to a heated reaction vessel. For IBA2-Methyl-N-N-N-N-tetrafluoro-1,2-propanediamine, this premature reaction has prevented the determination of limits for the thermally induced explosion. For 2,3-DB and 1,2-DB a method has been found to obtain such data. They show that the reaction mechanism is analogous to the mechanism for the thermally induced explosion of 1,3-DP.
- Physical Chemistry