基团贡献法预测水-1,3-丙二醇汽液相平衡数据

Prediction of vapor-liquid equilibrium by UNIFAC model for water-1,3-propanediol

以水 1,3 丙二醇为实验物系,在低压下,将气相视为理想气体、液相为非理想溶液的情况下,用UNIFAC基团贡献法估算了液相活度系数,并给出了此二元物系在100kPa,50kPa,10kPa下的汽液相平衡数据,结果表明此二元物系在全浓度范围内不形成共沸物.

The vapor-liquid equilibrium calculations for water-1,3-propanediol system at low pressures were performed. The liquid-phase non-idealities were described by activity coefficients, while the vapor-phase was considered to be ideal gas. The liquid-phase activity coefficients were estimated by UNIFAC group contribution method. Lastly the vapor-liquid equilibrium data were given at the pressures of 100 kPa, 50 kPa and 10 kPa. It indicated that no azeotropes were formed at the whole rang of the liquid-phase concentration.