FLUID-PHASE EQUILIBRIA OF BINARY AND TERNARY MIXTURES OF SUPERCRITICAL CARBON-DIOXIDE WITH A 1-ALKANOL AND AN N-ALKANE UP TO 100 MPA AND 393 K - COSOLVENCY EFFECT AND MISCIBILITY WINDOWS .2.

Cosolvency effects and miscibility windows were studied in selected te rnary systems containing a supercritical solvent (CO2), a 1-alkanol (1 -nonanol to 1-undecanol) and an n-alkane as the third component (n-pen tadecane to n-octadecane) according to the analytical method. In the p resent experiments the ranges of temperature and pressure were 288 K t o 393 K and 7.5 MPa to 100 MPa respectively. A new technique (so-calle d quasi-synthetic method) is described to determine critical parameter s of binary mixtures from synthetic measurements performed with the ga seous component being the pressurizing medium. It is the aim of the pr esent investigations to give a quantitative description of the cosolve ncy effect as a function of temperature and of the chain lengths of th e 1-alkanol and the n-alkane respectively, as a continuation of the sy stematic investigations of Kordikowski and Schneider (1993) as well as of Pohler and Schneider (1995). In order to compare systems with or w ithout a pressure minimum on the ternary critical line at a constant t emperature, a mean cosolvency effect was introduced, being a measure f or improved solubility in ternary systems which expresses itself by a positive curvature of the ternary critical line at constant temperatur e.