Lifetimes and global warming potentials for dimethyl ether and for fluorinated ethers: CH₃OCF₃ (E143a), CHF₂OCHF₂ (E134), CHF₂OCF₃ (E125)

Abstract

Abstract. Using recent kinetic data, two-dimensional (2-D) chemical-transport modeling of the atmospheric lifetimes of dimethyl ether and fluorinated ethers CH3OCF 3 (E143a), CHF2OCHF 2 (E134), and CHF2OCF3 (E125) shows that E134 and E125 have substantially larger lifetimes than previously estimated. Dimethyl ether has a short atmospheric lifetime of 5.1 days and a relatively insignificant radiative forcing leading to a relatively low global warming potential. Increasing fluorination is accompanied by slower rates of reaction with hydroxyl radical and ultimately longer lifetimes. E143a, E134, and E125 were found to have lifetimes of 5.7, 29.7, and 165 years, respectively. In addition, our work uses ab initio methodology to determine IR absorption cross sections for each ether. Our study finds that E134 and E125 have significant infrared absorption and thus relatively high radiative forcing values. These two properties together yield global warming potentials for E134 and E125 of 5720 and 14,000, respectively, integrated over a 100 year period.

A conceptual design by integrating dimethyl ether (DME) production with tri-reforming process for CO2 emission reduction

“…Moreover, DME does not produce soot [6,8]. Apart from above merits, the global warming potential for DME has been modeled and the results indicate that DME has a global warming potential of 0.1 for a 500-year time horizon, which is much lower than diesel [9]. Another important aspect is that DME has the highest well-to-wheel efficiencies next to natural gas among all non-petroleum based fuels no matter what type of vehicle technologies are applied including conventional, hybrid, and fuel processor fuel cell [6].…”

“…Furthermore, heat integration with the objective function of minimizing utility costs has been Fuel Processing Technology 131 (2015) [7][8][9][10][11][12][13] performed to optimize the heat exchange network (HEN). The production of DME via tri-reforming has two significant advantages: 1) CO 2 emission from flue gas of power plant is mitigated without extra CO 2 separation unit operations and 2) a viable carbon resource is converted into a useful chemical compound (DME).…”

A Faster Approach to Stereocomplex Formation of High Molecular Weight Polylactide Using Supercritical Dimethyl Ether

“…However, it is quite non-hazardous for being nonmutagenic, noncarcinogenic, nonteratogenic, and nontoxic. Wuebbles et al 28 reported that the global warming potential of DME is lower than that of carbon dioxide, methane, and dinitrogen oxide, demonstrating its ecofriendliness. However, it is flammable 29,30 and, thus, safety precautions must be followed when handling DME.…”

IR Spectra and Vibrational Modes of the Hydrofluoroethers CF3OCH3, CF3OCF2H, and CF3OCF2CF2H and Corresponding Alkanes CF3CH3, CF3CF2H, and CF3CF2CF2H~!2010-03-11~!2010-05-19~!2010-08-06~!

“…Computational studies have predicted the IR spectra of several fluorinated ethers and provided estimates of radiative forcings [7][8][9][10]. Information on lifetimes has come from several recent kinetics experiments [4,[11][12][13].…”