What is total reflux ratio in distillation?
The reflux ratio is defined as the ratio of the liquid returned to the column divided by the liquid removed as product, i.e., R = Lc/D.
What is the optimum reflux ratio?
The Optimum Reflux Ratio (R0) is that at which the total cost of the distillation is a minimum, taking into account the capital cost of the column (which depends on the number of theoretical plates) and running cost, which depends on the reflux ratio.
What is total reflux condition?
A condition in which all the overhead product from a distillation column is returned back to the column as reflux.
What does a high reflux ratio mean?
The Reflux ratio is the ratio between the boil up rate and the take-off rate. The higher the reflux ratio, the more vapor/liquid contact can occur in the distillation column. So higher reflux ratios usually mean higher purity of the distillate. It also means that the collection rate for the distillate will be slower.
Can you have a reflux ratio greater than 1?
If 5 parts of the reflux go back down the distillation column and 1 part is collected as distillate then the reflux ratio is 5:1. The higher the reflux ratio, the more vapor/liquid contact can occur in the distillation column. So higher reflux ratios usually mean higher purity of the distillate.
What happens when you decrease reflux ratio?
A lower reflux rate greatly reduces the methanol purity of the distillate. Therefore, a tray distillation apparatus operating at a greater reflux rate but constant distillate and bottoms rates will be more efficient for separation.
How does reflux ratio affect distillation concentration?
What is the minimum reflux ratio?
DEFINITION: The minimum reflux ratio is the ratio of L/D that leads to the intersection of the rectifying and stripping operating lines falling on the equilibrium curve (rather than inside it). This condition, however, would require an infinite number of stages (can you see why?).
What is the definition of reflux ratio?
Reflux Ratio: It is the ratio of liquid flow rate (L) from the reflux drum to the flow rate of distillate (D) (also called top product). Importance Of Reflux Ratio: Any change in reflux ratio will modify the slope of operation line, as can be seen in figure, this will alter the number of plates required for a given separation to be achieved.
What is distillation column reflux?
The reflux system in a typical industrial distillation column. Reflux is a technique involving the condensation of vapors and the return of this condensate to the system from which it originated. It is used in industrial and laboratory distillations. It is also used in chemistry to supply energy to reactions over a long period of time.