HIGH-PRESSURE VAPOR-LIQUID AND VAPOR-LIQUID-LIQUID EQUILIBRIA FOR SYSTEMS CONTAINING SUPERCRITICAL CARBON-DIOXIDE, WATER AND FURFURAL

We measured vapor-liquid equilibrium for a binary system CO2-furfural at temperatures of 303 and 323 K and vapor-liquid-liquid equilibrium for a ternary system CO2-water-furfural at temperatures of 303, 323 and 343 K and pressure of 5 MPa to obtain fundamental data for concentration of furfural by using three phase separation technique. Furthermore the experimental data were compared with results calculated by the Peng-Robinson equation of state combined with an asymmetric mixing rule. Results indicated that (1) the furfural-rich liquid phase contained more than 90wt% furfural on CO2-free basis and its concentration increased with decrease in temperature, and (2) the Peng-Robinson equation correlated the binary vapor-liquid equilibrium satisfactorily and estimated the ternary vapor-liquid-liquid equilibrium fairly well.