Measurement and prediction of CO2 solubility in sodium phosphate monobasic solutions for food treatment with high pressure carbon dioxide
作者： Giovanna Ferrentino , Diego Barletta , Murat Omer Balaban , Giovanna Ferrari , Massimo Poletto
DOI: 10.1016/J.SUPFLU.2009.10.005
关键词: Monobasic acid 、 Low sodium 、 UNIFAC 、 Sodium 、 PSRK 、 Chemistry 、 Aqueous solution 、 Gibbs free energy 、 Thermodynamics 、 Solubility
摘要: Abstract Two experimental systems were designed and tested to measure the CO 2 solubility in pure water sodium phosphate monobasic solutions (0.240, 2.40 4.80 g/100 g water) at different pressures (7.5 15.0 MPa) temperatures (35, 40 50 °C). The results compared with equilibrium conditions evaluated by applying three thermodynamic models means of process simulation software Aspen Plus ® : (1) Peng–Robinson equation state (EOS), Wong Sandler mixing rules (PRWS) excess Gibbs free energy calculated according UNIFAC method; (2) Electrolytic Non-Random Liquids (ELECNRTL) Redlich–Kwong for aqueous mixed solvent applications; (3) completely predictive Soave–Redlich–Kwong (PSRK) state. appeared be a strong function concentrations. predictions PRWS EOS agreed well data pressure temperature ranges tested. Larger differences between predicted observed close critical point low Predictions 3 had much larger deviations from data.
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