Interconversion of chlorofluorocarbons in plasmas

Abstract

Chlorofluorocarbons undergo interconversion during destruction in an argon arc plasma, so that, for example, in the exhaust gas from destruction of CCI2F2, CCIF3 is found to be the major residual ozone depleting substance: as electron capture detectors are lo4 times less sensitive for CCIF3, compared with CCI2F2, although these gases have the same ozone depleting potential, analysis of exhaust from destruction of chlorofluorocarbons is therefore not a trivial matter of determining only the level of input chlorofluorocarbon remaining.

Thermal plasma waste treatment

“…The former is an ODS with the same ozone-depletion potential as CCl 2 F 2 , while CF 4 has the very high global warming potential of 6500. Similar effects, although less marked, were found for the destruction of other CFCs and the halon CBrClF 2 [37,38]. Chemical kinetic calculations of the reactions of CFCs and halons predicted these experimental results reasonably accurately.…”

A review of CFC and halon treatment technologies – The nature and role of catalysts

“…(1) Thermal destruction, including gas phase combustion/incineration [2][3][4][5][6][7][8][9][10][11][12][13][14][15] and thermal plasma pyrolysis [16][17][18][19][20][21][22][23] (2) Non-thermal plasma processing [24][25][26][27][28][29] and radiation by UV, c-ray, and ultrasound [30][31][32] (3) Super critical water oxidation [33,34] (4) Biological degradation in anaerobic environment [35][36][37][38][39] (5) Catalytic destruction [40][41][42][43][44][45][46][47][48][49][50][51]…”

Destruction of ozone-depleting substances in a thermal plasma reactor

“…Deam et al 5 performed chemical kinetic simulations to determine the chemical pathways that contribute to this interconversion of ODSs. These were limited by their onedimensional nature and because they relied on estimated temperatures and residence times.…”