Abstract
The effect of sodium chloride, calcium chloride and zinc chloride at concentrations 5–20% by weight on the liquid—liquid equilibrium (LLE) data of the ternary system ethyl acetate(S)—methanol(C)—water(A) has been investigated experimentally at 30 °C. The region of heterogeneity is significantly increased with the addition of sodium and calcium chloride salts. A change in the direction of tie-line was observed for 10% sodium chloride, 20% calcium chloride and saturated zinc chloride exhibiting thereby a tendency to form solutropism for this system, which is non-solutropic under a no-salt condition. The selectivity values are also altered in comparison with that of a no-salt condition. The tie-line data have been correlated by the Eisen—Joffe equation. The solubility envelopes for the salt systems have been predicted using the NRTL model, from a knowledge of the binary vapor—liquid equilibria (VLE) determined experimentally in our laboratory employing the iso-activity criterion.
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