Navid Zanganeh - Food industry and Biological research center-Amirkabir university of technology،Chemical engineering department- Amirkabir university of technology
Farzin Zokaee Ashtiani - Food industry and Biological research center-Amirkabir university of technology،Chemical engineering department- Amirkabir university of technology
Mohsen Mohsen-Nia - Chemical engineering department- Amirkabir university of technology، Chemical engineering department-kashan university Amirkabir University of Ttechnology, ۴۲۴ Hafez Ave, Tehran, Iran

Solubility of lactose in ethanol/water mixture with various volume ratios was measured at 22, 30 and 38 °C. The lactose solubility is strongly dependent on the ethanol/water ratio in the mixture. The experimental data were correlated using a nonrandom two-liquid (NRTL) activity coefficient model. The parameters of the model were evaluated and reported. The obtained results indicate the applicability of the NRTL activity coefficient model for solid–liquid equilibrium calculations of the studied system.

Lactose , Solubility , Activity coefficient, NRTL model