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Supercritical Fluid Phase Separations Induced by Chemical Reactions

Published online by Cambridge University Press:  10 February 2011

Francis H. Ree  and
James A. Viecelli
Francis H. Ree
Affiliation:
Mathias van Thiel Lawrence Livermore National Laboratory, Livermore, CA 94550
James A. Viecelli
Affiliation:
Mathias van Thiel Lawrence Livermore National Laboratory, Livermore, CA 94550
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Abstract

Statistical mechanical studies predict that a chemically reactive system containing species composed of C, H, N, O atoms can exhibit a phase separation into a N2-rich and a N2-poor phase. The present work is concerned with the effect of the fluid phase separation upon addition of F atoms to the system. Our study shows that F atoms mainly appear as a constituent of HF in a N2-poor fluid phase up to a certain pressure beyond which they occur as CF4 in a N2-rich phase and that the phase separation may be abrupt in a thermodynamic sense. The pressure at the phase boundary can occur at about 30 GPa at 3000 K and about 10 GPa to 20 GPa at 1000 K. Some of these ranges may be accessible by present-day experimental high-pressure techniques. We discuss implications of this study to detonation physics.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 499: Symposium DD – High Pressure Materials Research , 1997 , 127
Copyright
Copyright © Materials Research Society 1998

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References

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