What is the Fenske Underwood Gilliland method?
The mathematical model of the column is obtained by performing a total mass balance and partial mass balances to component “ i .” The Fenske-Underwood-Gilliland method is used to find the functional relationship between the compositions of the bottom and the dome of the column.
What is Q Underwood equation?
where Underwood constant, θ is calculated as the root of following equation: where, 1 < θ < αLK and q is the quality of feed. Select an operating reflux ratio, R as a factor of minimum reflux ratio, typically a factor of 1.2 is considered. Number of stages, N is calculated based on Gilliland’s correlation.
What is the Fenske equation used for?
The Fenske equation in continuous fractional distillation is an equation used for calculating the minimum number of theoretical plates required for the separation of a binary feed stream by a fractionation column that is being operated at total reflux (i.e., which means that no overhead product distillate is being …
Does Fenske equation include reboiler?
The Fenske equation applies to distillation systems with constant relative volatility. Note that the form of the Fenske equation shown calculates the minimum number of plates; it does not include the reboiler (hence the -1 on the right hand side).
How do I find my light key and heavy key?
If you line up all the components in the order of their boiling points, and draw a line between two of them, the more volatile component is called the light key and the less volatile component is called the heavy key.
What is the minimum reflux ratio?
The Minimum Reflux Ratio (R min) is the lowest value of reflux at which separation can be achieved even with an infinite number of plates. It is possible to achieve a separation at any reflux ratio above the minimum reflux ratio.
What assumption is made in Fenske equation derivation?
The derivation of the Fenske equation assumes that the relative volatility is constant in the distillation column. Theoretical plates are also often referred to as theoretical trays or equilibrium stages.
What is heavy key?
Heavy Key (HK) Component: Defined as heaviest component in the overhead product in a significant amount.