Atmospheric chemistry of C4F9OC2H5(HFE-7200), C4F9OCH3(HFE-7100), C3F7OCH3(HFE-7000) and C3F7CH2OH: temperature dependence of the kinetics of their reactions with OH radicals, atmospheric lifetimes and global warming potentials.

The atmospheric chemistry of several gases used in industrial applications, C4F9OC2H5(HFE-7200), C4F9OCH3(HFE-7100), C3F7OCH3(HFE-7000) and C3F7CH2OH, has been studied. The discharge flow technique coupled with mass-spectrometric detection has been used to study the kinetics of their reactions with OH radicals as a function of temperature. The infrared spectra of the compounds have also been measured. The following Arrhenius expressions for the reactions were determined (in units of cm3molecule−1s−1): k(OH + HFE-7200) = (6.9+2.3−1.7) × 10−11exp(−(2030 ± 190)/T); k(OH + HFE-7100) = (2.8+3.2−1.5) × 10−11exp(−(2200 ± 490)/T); k(OH + HFE-7000) = (2.0+1.2−0.7) × 10−11exp(−(2130 ± 290)/T); and k(OH + C3F7CH2OH) = (1.4+0.3−0.2) × 10−11exp(−(1460 ± 120)/T). From the infrared spectra, radiative forcing efficiencies were determined and compared with earlier estimates in the literature. These were combined with the kinetic data to estimate 100-year time horizon global warming potentials relative to CO2of 69, 337, 499 and 36 for HFE-7200, HFE-7100, HFE-7000 and CF3CF2CF2CH2OH, respectively. [ABSTRACT FROM AUTHOR]

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