1. REFLUX RATIO
The reflux to a tower top is used to control the top temperature thereby controls the purity of the overhead product.
The amount of reflux compared to the product is known as the 'Reflux Ratio'.
An example of this is as follows:
The overhead liquid from a distillation column is divided into 4 m3 per hour reflux and 2 m3 per hour product. Therefore: