A khanmohammadi - Department of chemical engineering, Gachsaran Branch, Islamic Azad University, Gachsaran, Iran
S Mousavian - Department of chemical engineering, Gachsaran Branch, Islamic Azad University, Gachsaran, Iran
F Mousavian - Department of chemical engineering, Gachsaran Branch, Islamic Azad University, Gachsaran, Iran

The separation of more than two components by continuous distillation has traditionally been accomplished in petroleum refinery plant, chemical, petrochemical and many other process industries. Minimum reflux ratio is a key parameter to optimize operating cost and fixed cost of distillation column. The Underwood’s equations are very famous as they provide a shortcut method for evaluating the minimum reflux ratio of a multicomponent distillation column. This method is used to distillation column with one feed. In this research, a new method based on underwood method is developed to calculate minimum reflux ratio for column with two feeds. The result of this model compared with McCabe-Thiele method. The result shows that proposed method has a good agreement with McCabe-Thiele method

Distillation, Minimum reflux ratio, Underwood s method, Two feed column