Vapor-liquid phase equilibrium behavior of mixtures containing supercritical carbon dioxide near critical region

A new visual and volume-variable high-pressure phase equilibrium analyzer (PEA) was installed for determining the vapor-liquid phase boundaries over a wide pressure range, including near critical region, by a synthetic method. This apparatus was tested with the measurement of CO2+1-octanol. The PEA was also utilized to measure the isothermal vapor-liquid phase boundaries of CO2+ dimethyl sulfoxide, CO2 + propylene glycol monomethyl ether acetate, and CO2 + quinoline at temperatures from 308.15 to 358.15 K and pressures LIP to 28 MPa or near critical pressures. These phase boundary data were correlated with the Soave, the Peng-Robinson and the Patel-Teja equations of state, respectively. (C) 2007 Elsevier B.V. All rights reserved.