Minimum Liquid Rate for Absorption Column Calculator

✖The Gas Flowrate on Solute Free Basis is defined as the Inlet Gas Flowrate on solute free basis to the absorption column.ⓘ Gas Flowrate on Solute Free Basis [G_s]			+10% -10%
✖The Solute Free Mole Fraction of Gas in Inlet is the mole fraction of the Solute in the Gas stream entering the column on solute free basis.ⓘ Solute Free Mole Fraction of Gas in Inlet [Y_N+1]			+10% -10%
✖The Solute Free Mole Fraction of Gas in Outlet is the mole fraction of the solute in the exit gas stream of the column on solute free basis.ⓘ Solute Free Mole Fraction of Gas in Outlet [Y₁]			+10% -10%
✖The Equilibrium constant for Mass Transfer is the proportionality constant between gas phase mole fraction and liquid phase mole fraction and could be given as the ratio between the two.ⓘ Equilibrium Constant for Mass Transfer [α]			+10% -10%
✖The Solute Free Mole Fraction of Liquid in Inlet is the mole fraction of the solute in the solvent (liquid) in inlet of the column on solute free basis.ⓘ Solute Free Mole Fraction of Liquid in Inlet [X₀]			+10% -10%

✖The Minimum Liquid Flowrate on Solute Free Basis is defined as the Minimum Inlet Liquid Flowrate on solute free basis to the absorption column for a specified separation and Gas Flow Rate.ⓘ Minimum Liquid Rate for Absorption Column [L_smin]

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Formula

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Minimum Liquid Rate for Absorption Column

Formula

`"L"_{"smin"} = "G"_{"s"}*("Y"_{"N+1"}-"Y"_{"1"})/(("Y"_{"N+1"}/"α")-"X"_{"0"})`

Example

`"12.03592mol/s"="9mol/s"*("0.8"-"0.1")/(("0.8"/"1.5")-"0.0099")`

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Minimum Liquid Rate for Absorption Column Solution

STEP 0: Pre-Calculation Summary

Formula Used

Minimum Liquid Flowrate on Solute Free Basis = Gas Flowrate on Solute Free Basis*(Solute Free Mole Fraction of Gas in Inlet-Solute Free Mole Fraction of Gas in Outlet)/((Solute Free Mole Fraction of Gas in Inlet/Equilibrium Constant for Mass Transfer)-Solute Free Mole Fraction of Liquid in Inlet)
L_smin = G_s*(Y_N+1-Y₁)/((Y_N+1/α)-X₀)
This formula uses 6 Variables

Variables Used

Minimum Liquid Flowrate on Solute Free Basis - (Measured in Mole per Second) - The Minimum Liquid Flowrate on Solute Free Basis is defined as the Minimum Inlet Liquid Flowrate on solute free basis to the absorption column for a specified separation and Gas Flow Rate.
Gas Flowrate on Solute Free Basis - (Measured in Mole per Second) - The Gas Flowrate on Solute Free Basis is defined as the Inlet Gas Flowrate on solute free basis to the absorption column.
Solute Free Mole Fraction of Gas in Inlet - The Solute Free Mole Fraction of Gas in Inlet is the mole fraction of the Solute in the Gas stream entering the column on solute free basis.
Solute Free Mole Fraction of Gas in Outlet - The Solute Free Mole Fraction of Gas in Outlet is the mole fraction of the solute in the exit gas stream of the column on solute free basis.
Equilibrium Constant for Mass Transfer - The Equilibrium constant for Mass Transfer is the proportionality constant between gas phase mole fraction and liquid phase mole fraction and could be given as the ratio between the two.
Solute Free Mole Fraction of Liquid in Inlet - The Solute Free Mole Fraction of Liquid in Inlet is the mole fraction of the solute in the solvent (liquid) in inlet of the column on solute free basis.

STEP 1: Convert Input(s) to Base Unit

Gas Flowrate on Solute Free Basis: 9 Mole per Second --> 9 Mole per Second No Conversion Required
Solute Free Mole Fraction of Gas in Inlet: 0.8 --> No Conversion Required
Solute Free Mole Fraction of Gas in Outlet: 0.1 --> No Conversion Required
Equilibrium Constant for Mass Transfer: 1.5 --> No Conversion Required
Solute Free Mole Fraction of Liquid in Inlet: 0.0099 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

L_smin = G_s*(Y_N+1-Y₁)/((Y_N+1/α)-X₀) --> 9*(0.8-0.1)/((0.8/1.5)-0.0099)

Evaluating ... ...

L_smin = 12.0359167038146

STEP 3: Convert Result to Output's Unit

12.0359167038146 Mole per Second --> No Conversion Required

FINAL ANSWER

12.0359167038146 ≈ 12.03592 Mole per Second <-- Minimum Liquid Flowrate on Solute Free Basis

(Calculation completed in 00.008 seconds)

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Created by Vaibhav Mishra

DJ Sanghvi College of Engineering (DJSCE), Mumbai

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< 10+ Gas Absorption Calculators

Number of Absorption Stages by Kremser Equation

Go Number of Stages = log10(((Solute Free Mole Fraction of Gas in Inlet-(Equilibrium Constant for Mass Transfer*Solute Free Mole Fraction of Liquid in Inlet))/(Solute Free Mole Fraction of Gas in Outlet-(Equilibrium Constant for Mass Transfer*Solute Free Mole Fraction of Liquid in Inlet)))*(1-(1/Absorption Factor))+(1/Absorption Factor))/(log10(Absorption Factor))

Maximum Gas Rate for Absorption Column

Go Maximum Gas Flowrate on Solute Free Basis = Liquid Flowrate on Solute Free Basis/((Solute Free Mole Fraction of Gas in Inlet-Solute Free Mole Fraction of Gas in Outlet)/((Solute Free Mole Fraction of Gas in Inlet/Equilibrium Constant for Mass Transfer)-Solute Free Mole Fraction of Liquid in Inlet))

Minimum Liquid Rate for Absorption Column

Go Minimum Liquid Flowrate on Solute Free Basis = Gas Flowrate on Solute Free Basis*(Solute Free Mole Fraction of Gas in Inlet-Solute Free Mole Fraction of Gas in Outlet)/((Solute Free Mole Fraction of Gas in Inlet/Equilibrium Constant for Mass Transfer)-Solute Free Mole Fraction of Liquid in Inlet)

Minimum Operating Line Slope for Absorption Column

Go Minimum Operating Line Slope of Absorption Column = (Solute Free Mole Fraction of Gas in Inlet-Solute Free Mole Fraction of Gas in Outlet)/((Solute Free Mole Fraction of Gas in Inlet/Equilibrium Constant for Mass Transfer)-Solute Free Mole Fraction of Liquid in Inlet)

Gas Flowrate for Absorption Column on Solute Free Basis

Go Gas Flowrate on Solute Free Basis = Liquid Flowrate on Solute Free Basis/((Solute Free Mole Fraction of Gas in Inlet-Solute Free Mole Fraction of Gas in Outlet)/(Solute Free Mole Fraction of Liquid in Outlet-Solute Free Mole Fraction of Liquid in Inlet))

Liquid Flowrate for Absorption Column on Solute Free basis

Go Liquid Flowrate on Solute Free Basis = Gas Flowrate on Solute Free Basis*(Solute Free Mole Fraction of Gas in Inlet-Solute Free Mole Fraction of Gas in Outlet)/(Solute Free Mole Fraction of Liquid in Outlet-Solute Free Mole Fraction of Liquid in Inlet)

Number of Stages for Absorption Factor Equal to 1

Go Number of Stages = (Solute Free Mole Fraction of Gas in Inlet-Solute Free Mole Fraction of Gas in Outlet)/(Solute Free Mole Fraction of Gas in Outlet-(Equilibrium Constant for Mass Transfer*Solute Free Mole Fraction of Liquid in Inlet))

Operating Line Slope for Absorption Column

Go Operating Line Slope of Absorption Column = (Solute Free Mole Fraction of Gas in Inlet-Solute Free Mole Fraction of Gas in Outlet)/(Solute Free Mole Fraction of Liquid in Outlet-Solute Free Mole Fraction of Liquid in Inlet)

Absorption Factor

Go Absorption Factor = Liquid Flowrate on Solute Free Basis/(Equilibrium Constant for Mass Transfer*Gas Flowrate on Solute Free Basis)

Absorption Factor given Stripping Factor

Go Absorption Factor = 1/Stripping Factor

< 24 Important Formulas in Gas Absorption & Stripping Calculators

Number of Stripping Stages by Kremser Equation

Go Number of Stages = (log10(((Solute Free Mole Frac of Liquid in Stripping Inlet-(Solute Free Mole Frac of Gas in Stripping Inlet/Equilibrium Constant for Mass Transfer))/(Solute Free Mole Frac of Liquid in Stripping Out-(Solute Free Mole Frac of Gas in Stripping Inlet/Equilibrium Constant for Mass Transfer)))*(1-(1/Stripping Factor))+(1/Stripping Factor)))/(log10(Stripping Factor))

Number of Absorption Stages by Kremser Equation

Maximum Gas Rate for Absorption Column

Minimum Liquid Rate for Absorption Column

Minimum Operating Line Slope for Absorption Column

Gas Flowrate for Absorption Column on Solute Free Basis

Liquid Flowrate for Absorption Column on Solute Free basis

Number of Stages for Absorption Factor Equal to 1

Point Efficiency of Absorption Operation

Go Point Efficiency of Absorption Column in Percent = ((Local Mole Fraction of Vapor Leaving Nth Plate-Local Mole Fraction of Vapor Entering Nth Plate)/(Local Eqm Mole Fraction of Vapor on Nth Plate-Local Mole Fraction of Vapor Entering Nth Plate))*100

Murphree Tray Efficiency of Absorption Operation

Go Murphree Efficiency of Absorption Column = ((Average Mole Fraction of Vapour on Nth Plate-Average Mole Fraction of Vapour at N+1 Plate)/(Average Mole Fraction at Equilibrium on Nth Plate-Average Mole Fraction of Vapour at N+1 Plate))*100

Operating Line Slope for Absorption Column

Corrected Murphree Efficiency Percentage for Liquid Entrainment

Go Corrected Murphree Efficiency for Absorption = ((Murphree Efficiency of Absorption Column/100)/(1+((Murphree Efficiency of Absorption Column/100)*(Fractional Entrainment/(1-Fractional Entrainment)))))*100

Overall Tray Efficiency for Absorption Column given Murphree Efficiency

Go Overall Tray Efficiency of Absorption Column = (ln(1+(Murphree Efficiency of Absorption Column/100)*((1/Absorption Factor)-1))/ln(1/Absorption Factor))*100

Murphree Efficiency of Absorption Operation Based on Point Efficiency for Plug Flow

Go Murphree Efficiency of Absorption Column = (Absorption Factor*(exp(Point Efficiency of Absorption Column in Percent/(Absorption Factor*100))-1))*100

Stripping Factor

Go Stripping Factor = (Equilibrium Constant for Mass Transfer*Gas Flowrate on Solute Free Basis for Stripping)/Liquid Flowrate on Solute Free Basis for Stripping

Absorption Factor

Go Absorption Factor = Liquid Flowrate on Solute Free Basis/(Equilibrium Constant for Mass Transfer*Gas Flowrate on Solute Free Basis)

Liquid Flowrate on Solute Free Basis for Inlet Conditions by Solute Free Mole Fraction

Go Liquid Flowrate on Solute Free Basis = Inlet Liquid Flowrate/(1+Solute Free Mole Fraction of Liquid in Inlet)

Solute Free Mole Fraction of Liquid in Inlet based on Mole Fraction

Go Solute Free Mole Fraction of Liquid in Inlet = Liquid Inlet Mole Fraction/(1-Liquid Inlet Mole Fraction)

Gas Flowrate on Solute Free Basis for Inlet Conditions by Solute Free Mole Fraction

Go Gas Flowrate on Solute Free Basis = Inlet Gas Flowrate/(1+Solute Free Mole Fraction of Gas in Inlet)

Solute Free Mole Fraction of Gas in Inlet based on Mole Fraction

Go Solute Free Mole Fraction of Gas in Inlet = Gas Inlet Mole Fraction/(1-Gas Inlet Mole Fraction)

Liquid Flowrate on Solute Free Basis for Inlet Conditions using Mole Fraction

Go Liquid Flowrate on Solute Free Basis = Inlet Liquid Flowrate*(1-Liquid Inlet Mole Fraction)

Gas Flowrate on Solute Free Basis for Inlet Conditions by Mole Fraction

Go Gas Flowrate on Solute Free Basis = Inlet Gas Flowrate*(1-Gas Inlet Mole Fraction)

Stripping Factor given Absorption Factor

Go Stripping Factor = 1/Absorption Factor

Absorption Factor given Stripping Factor

Go Absorption Factor = 1/Stripping Factor

Minimum Liquid Rate for Absorption Column Formula

What are the factors to be considered for Solvent Selection ?

The factors to be considered are: 1. The gas solubility should be high, thus increasing the rate of absorption and decreasing the quantity of solvent required. 2. The solvent should have a low vapour pressure to reduce loss of solvent in the gas leaving an absorption column. 3. The materials of construction required for the equipment should not be unusual or expensive. 4. The solvent should be inexpensive, so that losses are not costly, and should be readily available. 5. Low viscosity is preferred for reasons of rapid absorption rates, improved flooding characteristics in packed column, low pressure drops on pumping, and good heat transfer characteristics. 6. The solvent should be non-toxic, non-flammable and chemically stable.

What is Minimum Liquid Rate for Absorption Column ?

The minimum liquid rate for absorption column is the minimum amount of solvent (liquid) required to achieve a defined separation target with fixed gas flow rate. This liquid flow rate is based on solute free basis. The minimum liquid rate can be graphically evaluated by the point at which the operating line meets the equilibrium curve, at this point the driving force is zero and is called the pinch point. At minimum liquid rate absorption, an infinite number of stages (or an infinite height of packed tower, if packing is used) is required.

How to Calculate Minimum Liquid Rate for Absorption Column?

Minimum Liquid Rate for Absorption Column calculator uses Minimum Liquid Flowrate on Solute Free Basis = Gas Flowrate on Solute Free Basis*(Solute Free Mole Fraction of Gas in Inlet-Solute Free Mole Fraction of Gas in Outlet)/((Solute Free Mole Fraction of Gas in Inlet/Equilibrium Constant for Mass Transfer)-Solute Free Mole Fraction of Liquid in Inlet) to calculate the Minimum Liquid Flowrate on Solute Free Basis, The Minimum Liquid Rate for Absorption Column formula is defined as the calculator for minimum liquid rate required for a defined target of separation to be achieved with fixed gas flow rate. Minimum Liquid Flowrate on Solute Free Basis is denoted by L_smin symbol.

How to calculate Minimum Liquid Rate for Absorption Column using this online calculator? To use this online calculator for Minimum Liquid Rate for Absorption Column, enter Gas Flowrate on Solute Free Basis (G_s), Solute Free Mole Fraction of Gas in Inlet (Y_N+1), Solute Free Mole Fraction of Gas in Outlet (Y₁), Equilibrium Constant for Mass Transfer (α) & Solute Free Mole Fraction of Liquid in Inlet (X₀) and hit the calculate button. Here is how the Minimum Liquid Rate for Absorption Column calculation can be explained with given input values -> 12.03822 = 9*(0.8-0.1)/((0.8/1.5)-0.0099).

FAQ

What is Minimum Liquid Rate for Absorption Column?

The Minimum Liquid Rate for Absorption Column formula is defined as the calculator for minimum liquid rate required for a defined target of separation to be achieved with fixed gas flow rate and is represented as L_smin = G_s*(Y_N+1-Y₁)/((Y_N+1/α)-X₀) or Minimum Liquid Flowrate on Solute Free Basis = Gas Flowrate on Solute Free Basis*(Solute Free Mole Fraction of Gas in Inlet-Solute Free Mole Fraction of Gas in Outlet)/((Solute Free Mole Fraction of Gas in Inlet/Equilibrium Constant for Mass Transfer)-Solute Free Mole Fraction of Liquid in Inlet). The Gas Flowrate on Solute Free Basis is defined as the Inlet Gas Flowrate on solute free basis to the absorption column, The Solute Free Mole Fraction of Gas in Inlet is the mole fraction of the Solute in the Gas stream entering the column on solute free basis, The Solute Free Mole Fraction of Gas in Outlet is the mole fraction of the solute in the exit gas stream of the column on solute free basis, The Equilibrium constant for Mass Transfer is the proportionality constant between gas phase mole fraction and liquid phase mole fraction and could be given as the ratio between the two & The Solute Free Mole Fraction of Liquid in Inlet is the mole fraction of the solute in the solvent (liquid) in inlet of the column on solute free basis.

How to calculate Minimum Liquid Rate for Absorption Column?

The Minimum Liquid Rate for Absorption Column formula is defined as the calculator for minimum liquid rate required for a defined target of separation to be achieved with fixed gas flow rate is calculated using Minimum Liquid Flowrate on Solute Free Basis = Gas Flowrate on Solute Free Basis*(Solute Free Mole Fraction of Gas in Inlet-Solute Free Mole Fraction of Gas in Outlet)/((Solute Free Mole Fraction of Gas in Inlet/Equilibrium Constant for Mass Transfer)-Solute Free Mole Fraction of Liquid in Inlet). To calculate Minimum Liquid Rate for Absorption Column, you need Gas Flowrate on Solute Free Basis (G_s), Solute Free Mole Fraction of Gas in Inlet (Y_N+1), Solute Free Mole Fraction of Gas in Outlet (Y₁), Equilibrium Constant for Mass Transfer (α) & Solute Free Mole Fraction of Liquid in Inlet (X₀). With our tool, you need to enter the respective value for Gas Flowrate on Solute Free Basis, Solute Free Mole Fraction of Gas in Inlet, Solute Free Mole Fraction of Gas in Outlet, Equilibrium Constant for Mass Transfer & Solute Free Mole Fraction of Liquid in Inlet 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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