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High pressure phase behaviour of {xCF4+ (1−x)H2O}

✍ Scribed by P.J. Smits; R.J.A. Smits; C.J. Peters; J. de Swaan Arons

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
269 KB
Volume
29
Category
Article
ISSN
0021-9614

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✦ Synopsis

Experimental results for the high pressure phase behaviour of fluid {xCF4 + (1x)H2O} are presented. (Gas + gas) equilibria for 10 compositions, with (0.0121 2 0.0002) Q x Q (0.0583 2 0.0002), were measured in a high pressure autoclave with sapphire windows and magnetic stirring. Phase transitions were determined visually. The pressure range was from 20 MPa to 200 MPa and the temperature range from 580 K to 673 K. The {xCF4 + (1x)H2O} system exhibits type-III fluid phase behaviour. For two mixtures, a critical point could be measured. The slope of the critical line commencing in the critical point of H2O starts with a negative slope. However, additional critical point measurements will be needed to establish (gas + gas) immiscibility of the second kind in {xCF4 + (1x)H2O}. The objective of this study was the investigation of the phase behaviour of a model system encountered in supercritical water oxidation processes.

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