Internal Reflux Ratio Calculator

✖The Internal Reflux Flowrate to Distillation Column is the number of moles of liquid flowing down through the column as reflux per unit time.ⓘ Internal Reflux Flowrate to Distillation Column [L]			+10% -10%
✖The Distillate flowrate from Distillation Column is the amount of moles of condensed top product (distillate) flowing out from the column per unit time.ⓘ Distillate Flowrate from Distillation Column [D]			+10% -10%

✖The Internal Reflux Ratio is the ratio of the liquid flowrate from the reflux drum back to the distillation column to the flowrate of distillate taken as product.ⓘ Internal Reflux Ratio [R_Internal]

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Internal Reflux Ratio Solution

STEP 0: Pre-Calculation Summary

Formula Used

Internal Reflux Ratio = Internal Reflux Flowrate to Distillation Column/Distillate Flowrate from Distillation Column
R_Internal = L/D
This formula uses 3 Variables

Variables Used

Internal Reflux Ratio - The Internal Reflux Ratio is the ratio of the liquid flowrate from the reflux drum back to the distillation column to the flowrate of distillate taken as product.
Internal Reflux Flowrate to Distillation Column - (Measured in Mole per Second) - The Internal Reflux Flowrate to Distillation Column is the number of moles of liquid flowing down through the column as reflux per unit time.
Distillate Flowrate from Distillation Column - (Measured in Mole per Second) - The Distillate flowrate from Distillation Column is the amount of moles of condensed top product (distillate) flowing out from the column per unit time.

STEP 1: Convert Input(s) to Base Unit

Internal Reflux Flowrate to Distillation Column: 10.5 Mole per Second --> 10.5 Mole per Second No Conversion Required
Distillate Flowrate from Distillation Column: 4.2 Mole per Second --> 4.2 Mole per Second No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

R_Internal = L/D --> 10.5/4.2

Evaluating ... ...

R_Internal = 2.5

STEP 3: Convert Result to Output's Unit

2.5 --> No Conversion Required

FINAL ANSWER

2.5 <-- Internal Reflux Ratio

(Calculation completed in 00.004 seconds)

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Created by Vaibhav Mishra

DJ Sanghvi College of Engineering (DJSCE), Mumbai

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Liquid Reflux Flowrate based on External Reflux Ratio

LaTeX Go External Reflux Flowrate to Distillation Column = External Reflux Ratio*Distillate Flowrate from Distillation Column

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LaTeX Go External Reflux Ratio = External Reflux Flowrate to Distillation Column/Distillate Flowrate from Distillation Column

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LaTeX Go External Reflux Ratio = External Reflux Flowrate to Distillation Column/Distillate Flowrate from Distillation Column

Internal Reflux Ratio

LaTeX Go Internal Reflux Ratio = Internal Reflux Flowrate to Distillation Column/Distillate Flowrate from Distillation Column

Boil-Up Ratio

LaTeX Go Boil-Up Ratio = Boil-Up Flowrate to the Distillation Column/Residue Flowrate from Distillation Column

Internal Reflux Ratio Formula

LaTeX Go

Internal Reflux Ratio = Internal Reflux Flowrate to Distillation Column/Distillate Flowrate from Distillation Column
R_Internal = L/D

What is the importance of Reflux Ratio in Distillation Column?

If reflux ratio is reduced (or if distillate rate D is increased compared to L) the more stages are required. Further reduction in Reflux Ratio leads to a point where infinite stages are required. This condition is known as minimum reflux. Any Increase in Reflux ratio above this point gives a workable system, upto the point where the reflux ratio reaches infinity and minimum number of stages are required, this condition is known as Total Reflux.

What is the effect of Reflux Ratio on Distillation Operation?

Distillation process is done to achieve a specific level of enrichment. To achieve this enrichment level, one must specify a reflux ratio. Decreasing that reflux ratio (i.e, increasing D), has an advantage that the duty of condenser and reboiler decreases, since the load in distillation column decreases (more mass goes out as D increases) . In other sense, the operating cost of distillation column decreases. However, it would be at expense of less enrichment achieved than required. Increasing reflux ratio would act in reverse i.e, it would have a disadvantage of increase in duty of condenser and reboiler as load increases. This increases the operation cost of distillation column; however, more enrichment is achieved.

How to Calculate Internal Reflux Ratio?

Internal Reflux Ratio calculator uses Internal Reflux Ratio = Internal Reflux Flowrate to Distillation Column/Distillate Flowrate from Distillation Column to calculate the Internal Reflux Ratio, The Internal Reflux Ratio formula is defined as the ratio of liquid flowing down to the distillation column to the distillate taken out as a product. Internal Reflux Ratio is denoted by R_Internal symbol.

How to calculate Internal Reflux Ratio using this online calculator? To use this online calculator for Internal Reflux Ratio, enter Internal Reflux Flowrate to Distillation Column (L) & Distillate Flowrate from Distillation Column (D) and hit the calculate button. Here is how the Internal Reflux Ratio calculation can be explained with given input values -> 2.5 = 10.5/4.2.

FAQ

What is Internal Reflux Ratio?

The Internal Reflux Ratio formula is defined as the ratio of liquid flowing down to the distillation column to the distillate taken out as a product and is represented as R_Internal = L/D or Internal Reflux Ratio = Internal Reflux Flowrate to Distillation Column/Distillate Flowrate from Distillation Column. The Internal Reflux Flowrate to Distillation Column is the number of moles of liquid flowing down through the column as reflux per unit time & The Distillate flowrate from Distillation Column is the amount of moles of condensed top product (distillate) flowing out from the column per unit time.

How to calculate Internal Reflux Ratio?

The Internal Reflux Ratio formula is defined as the ratio of liquid flowing down to the distillation column to the distillate taken out as a product is calculated using Internal Reflux Ratio = Internal Reflux Flowrate to Distillation Column/Distillate Flowrate from Distillation Column. To calculate Internal Reflux Ratio, you need Internal Reflux Flowrate to Distillation Column (L) & Distillate Flowrate from Distillation Column (D). With our tool, you need to enter the respective value for Internal Reflux Flowrate to Distillation Column & Distillate Flowrate from Distillation Column and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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