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FLUORINATED ETHERS--A NEW SERIES OF CFC SUBSTITUTES
Citation:
Adcock, J., S. Mathur, W. VanHook, H. Huang, M. Narkhede, B. Wang, N. Smith, AND P. Joyner. FLUORINATED ETHERS--A NEW SERIES OF CFC SUBSTITUTES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-92/211 (NTIS PB93106805), 1991.
Description:
The paper discusses fluorinated ethers, a new series of chlorofluorocarbon (CFC) substitutes. ompounds synthesized to produce substances with suitable refrigerant properties have generally left out sulfur, nitrogen, and oxygen. he reasons for these omissions are many and varied. he general result is that all currently proposed substitutes for CFC and halon replacements have been alkanes. ecause of the limited number of compounds of these elements having suitable properties and the current decision to phase out CFCs and (eventually) hydrochlorofluorocarbons (HCFCs), restricting the search to alkanes only is no longer tenable. onsideration of fluorinated ethers effectively doubles the potential list of contenders. he fact that divalent oxygen in a fluorocarbon chain has only a modest effect on vapor pressure, compared to the alkane of similar carbon number and substitution, should be a strong incentive to investigate these compounds. everal new fluorinated compounds have been synthesized (principally by aerosol direct fluorination) and characterized. dditionaly, several compounds for which data were not available were synthesized. hese compounds, both new and two "revisited" ones, could function as replacement working fluids in many applications requiring similar properties. ithout chlorine, all have zero ozone depletion potential.
