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

The influence of pressure and temperature on the phase behavior of the systems H2O+C4E1+C8 and H2O+C4E2+C8 is investigated. At constant pressure and increasing temperature, a 2→3→2 type phase behavior was observed for both the systems, while at constant temperature and increasing pressure, a 2→3→2 type phase behavior was found. The systems H2O+C4E1+C10, H2O+C4E1+C8 and H2O+C7E5+C12 are modeled with the SAFT HS equation of state. Although the model gives qualitatively the correct phase behavior, the quantitative match with the experimental data is found to be unsatisfactory.