MODELING OF PHASE EQUILIBRIA FOR AQUEOUS SOLUTIONS OF SUGARS USING A CUBIC EQUATION OF STATE

摘要: PRSV, which is the Peng-Robinson equation of state improved by Stryjek and Vera in 1986, was used to model predict thermodynamic properties water-sucrose, water-glucose, water-fructose, water-maltose water-xylose solutions. Binary interaction parameters were obtained fitting binary vapor-liquid equilibrium data expressed as water activity. The activity synthetic honey boiling point temperature pure sucrose solutions calculated compared with experimental data. fugacities glucose xylose also estimated aqueous saturated at solid phase, these values from extrapolated sublimation pressure. results showed that this method able estimate sugar mixtures order magnitude vapor pressure sugars. PRACTICAL APPLICATIONS Nowadays there a tendency employ high-pressure processes, but coefficient models type UNIQUAC UNIFAC are not appropriate for modeling phase equilibria. In cases, employing has been recommended properties. However, simple cubic such original (PR-EOS) does accurately water, critical calculation when molar fraction xw1, so dependence attractive term PR-EOS PRSV-EOS, analytical form 1986 equation, can water. main purpose present study sugar-water systems low pressure, should be useful processes.