What does the Fenske equation calculate?
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 …
What is Gilliland equation?
An empirical equation used to estimate the number of stages required in a distillation column. It uses the minimum number of stages as well as minimum and actual reflux ratios in the calculation.
What is light and heavy key?
The most volatile of the keys is called the light key (LK) and the least volatile is called the heavy key (HK). The other components are called non-keys (NK). Light non-key (LNK) is referred when non-key is more volatile than the light key whereas heavy non-key (HNK) is less volatile than the heavy key.
What is the light key and heavy key?
Solution: introduce a light key component or heavy key component in the inlet stream. Wrong key component selection! No key component selected! Solution: select the light key component and the heavy key component .
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).
What is Q in Mccabe Thiele method?
The parameter q is the mole fraction of liquid in the feed and the slope of the q-line is q / (q – 1). For example, if the feed is a saturated liquid it has no vapor, thus q = 1 and the slope of the q-line is infinite which means the line is vertical.
What is the value of Q for saturated liquid?
DETAILS OF q-LINE :
| VALUE OF q | SLOPE OF THE q-line (Equation 1) |
|---|---|
| 0 | 0 i.e. Horizontal Line |
| 1 | Infinite i.e. vertical line |
| 0-1 | -ve inclined between saturated liquid and saturated vapor line |
| >1 | +ve inclined beyond saturated q-line |
What is Theta in 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.
How do you determine the light and heavy key components?
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.