Synthesis of perfluoroalkanes by high-temperature reaction of graphite with fluorine in a fluidized bed

Pashkevich, D. S.; Shelopin, G. G.; Mukhortov, D. A.; Petrov, V. B.; Alekseev, Yu. I.; Asovich, V. S.

doi:10.1007/s11167-005-0174-6

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…A similar mechanism was postulated by J. Burdon et al [16,17], for the reaction of ethane with either CoF 3 or KCoF 4 , and by Kornilov et al [18] for the fluorination of ethene on CoF 3 , CeF 4 and MnF 3 at temperatures lower than 450°C. Based on the product distribution, the latter including fluoroalkanes (1,1-difluoroethane and 1,1,2-trifluoroethane, 1,1,1,2-tetrafluorethane), polyfluoroalkanes, and alkenes with more than 4 C atoms, the authors suggested the following reaction pathway: In the reaction of ethylene with CoF 4 , CoF 3 and MnF 3, Kornilov [19] observed a direct correlation between the 1,1,1,2-tetrafluorethane-to-1,1,2,2-tetrafluoroethane ratio and the type of fluorinating metal used.…”

Section: Reaction Mechanismsupporting

confidence: 65%

Direct Oxyfluorination of Hydrocarbons on Metal Fluorides

et al. 2008

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A critical overview of the recent literature data and of our results on the oxyfluorination of C-H to C-F bond with metal fluorides is presented. Some important aspects that require further investigation, in order to obtain a better understanding of the reaction mechanism and to develop a general approach to catalysts design are discussed. In particular, the oxyfluorination of ethene, utilizing different metal fluorides, in pulse and continuous reactors, was studied. Obtained results indicated that the presence of mixed fluorides with a fluoroperovskite structure, such as AgCuF 3 , led to improved reactant conversion and higher selectivity to vinyl fluoride, in comparison to the single metal fluorides. CO 2 is formed from secondary parallel reaction upon ethene oxidation, because of the presence of metal oxides in the catalysts. The difficulties met in the regeneration of the Ag°formed during oxyfluorination, addressed the search for new metal fluorides as starting materials for the synthesis of perovskite-like materials. Still, among the prepared mixtures only in the case of AgCuF 3 the formation of perovskite-like materials was evidenced by means of XRD; such behaviour is explained by means of the Goldschmidt factor t.

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Section: Reaction Mechanismsupporting

confidence: 65%

Direct Oxyfluorination of Hydrocarbons on Metal Fluorides

et al. 2008

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“…Perfluorinated alkanes with a molecular formula C n F 2 n +2 have outstanding properties, very different from those of normal hydrocarbons that make them ideal candidates for a variety of applications ranging from lubricants to artificial blood substitutes. − Their chemical structure and the weak intermolecular interactions are mainly responsible for their unique properties …”

Section: Introductionmentioning

confidence: 99%

Surface Tension and Surface Orientation of Perfluorinated Alkanes

Tsige

Grest

2008

J. Phys. Chem. C

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Molecular dynamics simulations using two all-atom force fields, the OPLS force field of Jorgensen et al. and the recently developed force field of , have been used to study the equilibrium liquidvapor interface properties of perfluorinated alkanes. Both force fields predict similar liquid densities and are in excellent agreement with existing experimental data for short chains. The OPLS force field offers better agreement with experimental data for surface tension at lower molecular weights than the exp-6 force field, which overpredicts it by as much as 9%. However, for longer chains the OPLS force field predicts higher surface tension than the exp-6 force field. Also, the OPLS substantially overpredicts the melting temperature confirming a recent suggestion that this force field may not be transferable to longer perfluorinated alkane chains. The orientation of the chains at the surface is found to be strongly dependent on both chain length and temperature. On average, the chain segments tend to orient perpendicular to the surface with the -CF 3 end segments at the surface.

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