The thermal decomposition of perfluorocyclopropane

Abstract

ABS TRACTThe thermal decomposition of perfluorocyclopropane has been studied in a static reactor. Pressure changes during the reaction were followed with a pressure transducer and products analyzed by gas-solid chromatography.

The “Bond‐Stretched Invertomer” of Hexafluorocyclopropane—a New Type of Reactive Intermediate

“…The barrier height computed for the latter reaction is in reasonable agreement with the experimental value of E a = 38.6 kcal mol À1 , measured in the temperature range 253-276 8C. [11] It has been previously suggested, based on the results of MP2/6-31G* calculations, that 5 actually lies on the reaction pathway for extrusion of difluorocarbene from 4.…”

Chain elongation during thermolysis of tetrafluoroethylene and hexafluoropropylene: Modeling of mechanistic hypotheses and elucidation of data needs

“…However, it has not been observed from thermolysis of the perfluoro-olefins in the low-temperature regime and a claim of its observation in the hightemperature regime has been questioned (see below). Indeed it was converted cleanly at only 276 • C to C 2 F 4 , with <0.1% C 3 F 6 even at 70% conversion [14]. The same stoichiometry c-C 3 F 6 → 3/2 C 2 F 4 was observed under shock-tube conditions up to ≈475 • C, before secondary reactions of C 2 F 4 began to intervene [15].…”

Treatment technologies for aqueous perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA)

“…The thermolysis of fluorochemicals has been documented experimentally under more controlled conditions to determine individual reaction kinetics and mechanisms [230][231][232][233][234][235][236][237][238][239][240][241], and under more industrial conditions to test incinerability [81,111,113] or other thermal degradation processes [242]. A comprehensive experimental and theoretical database of C 1 and C 2 fluorochemical pyrolytic and combustion mechanisms, thermochemistry, and kinetics has been reported [243].…”