Description of Three Phase Systems and Liquid‐Liquid Equilibria at High Pressures on the Basis of a Mean‐Field Lattice‐Gas Model

Abstract

AbstractThe calculation of phase equilibria in systems with dense supercritical components by means of a method developed by Kleintjens and Koningsveld was investigated. The three phase equilibria (gas, liquid, solid) in the systems H2O/NaCl (18.0—92.0 MPa, 673 — 873 K) and H2O/KBO2 (16.0—70.0 MPa, 670—771 K) can be successfully represented by using substance specific parameters derived from VLE equilibria. — Also the representation of the liquid‐liquid equilibria in the binary systems of 2‐methoxyethanol with different alkanes, which have upper critical solution temperatures and lower critical solution pressures in the temperature range 250 — 430 K and at pressures from 0.1 —400 MPa can be achieved.