Influence of pressure on the LLLE in water plus n-alkyl polyoxyethylene ether plus n-alkane systems

The influence of pressure and temperature on the phase behavior of the syst ems H2O + C4E1 + C-8 and H2O + C4E2 + C-8 is investigated. At constant pres sure and increasing temperature, a (2) under bar --> 3 --> (2) over bar typ e phase behavior was observed for both the systems, while at constant tempe rature and increasing pressure, a (2) over bar --> 3 --> (2) under bar type phase behavior was found. The systems H2O + C4E1 + C-10, H2O + C4E1 + C-8 and H2O + C7E5 + C-12 are modeled with the SAFT HS equation of state. Altho ugh the model gives qualitatively the correct phase behavior, the quantitat ive match with the experimental data is found to be unsatisfactory. (C) 199 9 Elsevier Science B.V. All rights reserved.