Total Reflux (minimum no. of plates)

The total reflux condition represents operation with no product removal. All the overhead product is condensed and returned as reflux. Consequently D = 0 and reflux ratio becomes infinite. (RD = L/D = ∞). This in turn, makes the operating line, 45° line where V = L and slope = 1. The operating line then coincides with diagonal. This condition is called total reflux. Read more