Chlorofluorocarbon plasma

Chemical removal of surface material is produced through standard bond-breaking reactions. Typically chlorofluorocarbons (CECs) have been used, eg, CECl, CE2CI2, CE Cl, CE4, CHE, C2C1E. Eor example, CE dissociates into E atoms and fluorinated fragments of CE in a plasma ... 

Beclomethasone dipropionate and budesonide Modulite formulations have been compared with equivalent chlorofluorocarbon products in small groups of healthy volunteers and asthmatic patients (18) there was no significant difference in morning serum cortisol or urinary cortisol excretion, suggesting that the systemic availability of the inhaled corticosteroids with different propellants is similar. Moreover, plasma profiles of beclomethasone dipropionate and B17MP were similar after inhalation of beclomethasone dipropionate Modulite and beclomethasone dipropionate-chlorofluorocarbon, suggesting that pulmonary delivery to the lung is comparable with the two propellants (18). 

For the last two decades, attention has been focused on redressing the ozone depletion in the earth s protective layer. It is believed that chlorine radicals dissociated from chlorofluorocarbons (CFCs), upon irradiation of sun s UV in the stratosphere, promotes the ozone depletion. Hence, in addition to development of CFC alternatives there is an urgent need for the safe disposal of CFCs. Several processes such as pyrolysis, incineration, photocatalysis, oxidative destruction over metal oxide or zeolite catalysts and destruction at very high temperatures ( by plasma technique ) are reported in the literature for the disposal of CFCs[ 1-5]. But all these processes yield harmful products like CO, HF/F2 etc. Catalytic conversion of chlorinated organics in presence of hydrogen seems to be a better technique as it yields either hydrofluorocarbons(HFCs) or hydrochlorofluorocarbons(HCFCs) whose ozone depletion potential is either zero or very low and yet most of these products act as CFC alternatives. 

Plasma Decomposition of Freons (Chlorofluorocarbons) and Other Waste Treatment Processes Organized in Thermal and Transitional Discharges... 

The destruction of chlorofluorocarbons (CFCs) which are ozone-depleting substances banned by the Montreal Protocol represents a particular technical challenge. Very high temperatures (> 1,250°C) provided by high-temperature incineration and thermal plasma torches are needed to destroy the CFCs safely without the formation... 

The SPT uses steam (water vapour) as the main plasma forming gas. The high reactivity of the hydroxyl ions produced by the ionization of steam allows for the destruction of highly stable hazardous substances such as chlorofluorocarbons and brominated hydrocarbons. Other applications of steam plasma include steam reforming, coal gasification, steam arc cutting, and rapid decontamination of large surfaces. 

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