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High-pressure phase behaviour of {xCHF3+(1−x)H2O} and {x1CHF3+x2NaCl+(1−x1−x2)H2O}

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

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

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✦ Synopsis

Ä

Ž . 4 Experimental results of the high-pressure phase behaviour for xCHF q 1 y x H O and 3 2 Ä Ž . 4 Ž . x CHF q x NaCl q 1 y x y x H O are presented. Gas q gas equilibria for five 1 3 2 1 2 2 Ž .Ž . Ž . compositions with x CHF 0.0334 " 0.0002x -0.1389 " 0.0002 as well as for six 3 Ž . Ž . Ž . compositions with x CHF 0.0305 " 0.0002x -0.1096 " 0.0002 , and mole fractions 1 3 1 Ž .Ž . Ž . xNaCl 0.0046 " 0.0002x -0.0100 " 0.0002 were measured in a high-pressure

2 2 autoclave equipped with sapphire windows and magnetic stirring. The phase transitions were determined visually. The pressure ranged from 20 MPa to 200 MPa, and the temperature Ä Ž . 4 from T s 470 K to T s 625 K. The xCHF q 1 y x H O exhibits a type-III fluid phase 3 2 Ž . behaviour without gas q gas immiscibility of the first kind. Isopleths for NaCl mass Ž . fractions s 0.01677 and 0.03336 relative to H O are shifted towards higher temperatures 2 Ä Ž . 4 compared with the binary mixture xCHF q 1 y x H O . In this system the temperature 3 2 Ä Ž . 4 shift is more pronounced than for isopleths in the system xCF q 1 y x H O upon NaCl 4 2

addition. The objective of this study was to investigate the phase behaviour of model-systems encountered in supercritical water oxidation processes.

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