Thermodynamic stability of complexes of BF{sub 3}, PF{sub 5} and AsF{sub 5} with chlorine fluorides, oxyfluorides, and related compounds
The recent discovery of solid, water sensitive, arsenic-containing deposits in auxiliary process piping in the PGDP led to a search for explanations that could account for such accumulated material. A plausible explanation for the deposits is the formation of complexes of AsF{sub 5} with one or more gases that may have been present as a result of cascade equipment cleanup activities. A literature search was performed. The target of the search was literature that would provide information on the dissociation pressure of complexes of AsF{sub 5} or its hydrolysis products with any gases that may be (at least intermittently) present in the cascade location where the deposits were found. While the precise information sought (namely reliable, accurate dissociation pressures of such complexes at cascade temperatures) was not found in the detail desired. other information on these or similar complexes was obtained which permits prediction of the conditions under which the complexes might form, dissociate, or migrate, and how they might behave in the presence of atmospheric moisture. Information was gathered on potential AsF{sub 5} complexes with ClF, ClF{sub 3}, ClF{sub 5}, ClF{sub 3}O, ClO{sub 2}F, and ClO{sub 3}F. Information was also collected on many other related complexes as it was encountered, particularly for series of complexes which could assist in predicting chemical trends. Thermodynamic analysis and property estimation methods have been used to generate provisional estimates of the dissociation pressures of the two complexes ClF{sub 3}*AsF{sub 5} and ClO{sub 2}F*AsF{sub 5}. In addition, several hydrolysis species have been identified, and stability properties of the most relevant such complex (H{sub 3}O*AsF{sub 6}) have similarly been estimated. While the predicted dissociation pressures are somewhat uncertain. they do lead to a tentative picture of the formation and behavior of such complexes in a cascade cleanup environment.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 269026
- Report Number(s):
- K/TSO-31; ON: DE96013557; TRN: 96:017120
- Resource Relation:
- Other Information: PBD: Jul 1996
- Country of Publication:
- United States
- Language:
- English
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