Gas-phase chemical reactivity of CFC-114 and potential replacements. [Reactions of cyclo-C sub 4 F sub 8 with UF sub 6 and F sub 2]
The DOE gaseous diffusion plant complex makes extensive use of CFC-114 as a primary coolant. As this material is on the Montreal Protocol list of materials scheduled for production curtailment, a substitute must be found. In addition to physical cooling properties, the gaseous diffusion application imposes the unique requirement of chemical inertness to fluorinating agents. A series of studies has therefore been undertaken to evaluate the gas-phase chemical reactivity of potential alternate coolants. This report examines the reactivity of perfluorocyclobutane (C-C{sub 4}F{sub 8}) with UF{sub 6} and F{sub 2} at selected reference conditions (approximately 10 Torr partial pressure of each reactant at 150{degrees}C). At the reference conditions, a very slight degree of reactivity was observed with F{sub 2}, but much less than the observed reactivity of the reference coolant, CFC-114. No reaction was observed with UF{sub 6}. A limited number of experiments was conducted at higher temperature, providing a first estimate of the rate of increase of reaction rate with increased temperature.
- Research Organization:
- Oak Ridge K-25 Site, TN (United States). UEO Enrichment Technical Operations Div.
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OT21400
- OSTI ID:
- 7038985
- Report Number(s):
- K/ETO-93; ON: DE92019277
- Country of Publication:
- United States
- Language:
- English
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