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"NASA Technical Reports Server (NTRS) 19920006226: Atmospheric Degradation Mechanisms Of Hydrogen Containing Chlorofluorocarbons (HCFC) And Fluorocarbons (HFC)" and the language of the book is English.


“NASA Technical Reports Server (NTRS) 19920006226: Atmospheric Degradation Mechanisms Of Hydrogen Containing Chlorofluorocarbons (HCFC) And Fluorocarbons (HFC)” Metadata:

  • Title: ➤  NASA Technical Reports Server (NTRS) 19920006226: Atmospheric Degradation Mechanisms Of Hydrogen Containing Chlorofluorocarbons (HCFC) And Fluorocarbons (HFC)
  • Author: ➤  
  • Language: English

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  • Internet Archive ID: NASA_NTRS_Archive_19920006226

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"NASA Technical Reports Server (NTRS) 19920006226: Atmospheric Degradation Mechanisms Of Hydrogen Containing Chlorofluorocarbons (HCFC) And Fluorocarbons (HFC)" Description:

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The current knowledge of atmospheric degradation of hydrogen containing chlorofluorocarbons (HCFC 22 (CHClF2), HCFC 123 (CHCl2CF3), HCFC 124 (CHClFCF3), HCFC 141b (CFCl2CH3), HCFC 142b (CF2ClCH3)) and fluorocarbons (HFC 125 (CHF2CF3), HFC 134a (CH2FCF3), HFC 152a (CHF2CH3)) is assessed. Except for the initiation reaction by OH radicals, there are virtually no experimental data available concerning the subsequent oxidative breakdown of these molecules. However, from an analogy to the degradation mechanisms of simple alkanes, some useful guidelines as to the expected intermediates and final products can be derived. A noteable exception from this analogy, however, appears for the oxi-radicals. Here, halogen substitution induces new reaction types (C-Cl and C-C bond ruptures) which are unknown to the unsubstituted analogues and which modify the nature of the expected carbonyl products. Based on an evaluation of these processes using estimated bond strength data, the following simplified rules with regards to the chlorine content of the HCFC's may be deduced: (1) HCFC's containing one chlorine atom such as 22 and 142b seem to release their chlorine content essentially instantaneous with the initial attack on the parent by OH radicals, and for HCFC 124, such release is apparently prevented; (2) HCFC's such as 123 and 141b with two chlorine atoms are expected to release only one of these instantaneously; and the second chlorine atom may be stored in potentially long-lived carbonyl compounds such as CF3CClO or CClFO.

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