HIGH-PRESSURE PHASE-BEHAVIOR OF (X(1)CF(4)-X(1)-X(2))H2O)(X(2)NACL+(1)

Experimental results of the high pressure phase behaviour for {x(1)CF( 4) + x(2)NaCl + (1-x(1)-x(2))H2O} are presented. (Gas + gas) equilibri a for 10 compositions, with mole fractions of CF4 (0.0076 +/- 0.0002) < x(1) < (0.0335 +/- 0.0002), and NaCl (0.0032 +/- 0.0002) < x(2) < (0 .0103 +/- 0.0002) were measured in a high-pressure autoclave with sapp hire windows and magnetic stirring. Phase transitions were determined visually. The pressure range was from 20 MPa to 200 MPa and the temper ature range from T = 585 K to T = 663 K. Isopleths for NaCl mass fract ions omega = (0.011, 0.021 and 0.033) relative to H2O are shifted towa rds higher temperatures compared with the binary mixture {xCF(4) + (1- x)H2O}. The objective of this study was the investigation of the phase behaviour of a model-system encountered in supercritical water oxidat ion processes. (C) 1997 Academic Press Limited.