Mass Transfer Operation-1
CL 205
Absorption/stripping
Soumen Kr. Maiti
Date: 14/03/2017
Absorption: Purification of gas stream
Plate/stray/stage tower
Liquid +
Gas
low
+low
solute solute
G
Gas
+high
solute
Gas
(air+low
CO2/SO2)
Packed tower
Food/ chemic
Mass Transfer Operation-1
CL 205
Absorption/stripping column height:
Tutorial
Soumen Kr. Maiti
Date: 27/03/2017
Tutorial: Plate/tray tower for absorption
EX-1: It is desired to absorb 95% of acetone by water from a
mixture of acetone and nitrogen containi
Mass Transfer Operation-1
CL 205
Distillation
(Tutorial: multistage batch)
Soumen Kr. Maiti
Date: 24/04/2017
Graph for two trays including boiler
Operating line :
R
xD
y
x
R 1
R 1
For constant reflux ratio (R)
xW and xD gradually decrease
with time
So d
Mass Transfer Operation-1
CL 205
Distillation
Soumen Kr. Maiti
Date: 05/04/2017
Batch/Differential/Rayleigh distillation
(for binary mixture)
Differential mass balance as liquid and vapour phase
concentrations of the component change continuously.
Ant t
Mass Transfer Operation-1
CL 205
Distillation
Soumen Kr. Maiti
Date: 03/04/2017
Distillation
Distillation (vapor-liquid contact )
Separating high volatile
component from low volatile
component
In absorption : use third
component (separation
based on so
Mass Transfer Operation-1
CL 205
Absorption/stripping
Soumen Kr. Maiti
Date: 14/03/2017
Absorption: Purification of gas stream
Plate/stray/stage tower
Liquid +
Gas
low
+low
solute solute
G
Gas
+high
solute
Gas
(air+low
CO2/SO2)
Packed tower
Food/ chemic
Mass Transfer Operation-1
CL 205
Distillation
Soumen Kr. Maiti
Date: 13/04/2017
Number of ideal trays (McCabe-Thiele)
1
Steps:
i) Draw equilibrium line
ii) Locate (xD,xD) point
iii) Reflux ratio (R) =?
iii) Draw the operating line
Passing through (xD,xD)
Mass Transfer Operation-1
CL 205
Gas/vapor-Liquid contacting equipment
(Absorption/stripping/distillation)
Soumen Kr. Maiti
Date: 08/03/2017
Equipment for interphase mass transfer
Equipment and devices for interphase mass transfer:
o Gas-liquid or vapor
Mass Transfer Operation-1
CL 205
Distillation
(Tutorial: Ponchon Savarit)
Soumen Kr. Maiti
Date: 18/04/2017
Ponchon Savarit method
EX-1: 1000 kg/hr of a mixture containing 42 mole percent heptane and 58
mole percent ethyl benzene is to be fractionated to
Mass Transfer Operation-1
CL 205
1) Minimum tray using Fenskes Equation
2) Co and counter current process
3) Tutorial
Soumen Kr. Maiti
Date: 26/04/2017
Fenskes Equation (Analytical) (minimum trays at Rtotal ?)]
Average relative volatility known
Total refl
Mass Transfer Operation-1
CL 205
Distillation
Soumen Kr. Maiti
Date: 17/04/2017
Tutorial (number of ideal trays, McCabe-Thiele)
EX-1: Aqueous feed stream having 45 mole% methanol is to be separated into
a top product having 96 mole% of methanol and a bott
Mass Transfer Operation-1
CL 205
Distillation
1) Design of packed bed distillation
2) Reflux below its bubble point in Macabe Thiele
3) Ropt (cost basis)?
Soumen Kr. Maiti
Date: 25/04/2017
Packed tower distillation column
Packed tower distillation column
Mass Transfer Operation-1
CL 205
Distillation
Soumen Kr. Maiti
Date: 04/04/2017
Relative volatility
Relative volatility (): indicates the ease of the
separation of A from a mixture from another
component B
Vapour
A+B
T, Pt
Liquid
A+B
mole fraction of A
in
Mass Transfer Operation-1
CL 205
Absorption/stripping
Soumen Kr. Maiti
Date: 06/03/2017
Course
Diffusion, mass transfer, interphase mass transfer,
contact equipment (MID SEMESTER)
Unit operation involves mass transfer
Absorption/stripping (Gas-liquid co
TUTOTIAL 3
Instructor: Prof. Bishnupada Mandal
Course No.: CL 205
Course Name: Mass Transfer Operations I
Date: 27.03.2017
P1: A plate absorption column is used to reduce the concentration of a pollutant A
in an air stream from 5.4% to 0.3% v/v by counter
Mass Transfer Operation-1
CL 205
Absorption/stripping column height:
Lecture: HTU, NTU for packed column
and tray or plate number of plate or tray tower
and HETP
Soumen Kr. Maiti
Date: 23/03/2017
Height of packed column: mole fraction/mole ratio
G2, G S
y
Mass Transfer Operation-1
CL 205
Absorption/stripping column height
Soumen Kr. Maiti
Date: 22/03/2017 (1+1 hrs)
Design of packed tower absorption column:
Based on individual mass transfer coefficient
G2
y2
L2
x2
a
G1: rate of input of gas (mol/min), (carr
Dr. Senthilmurugan S. Department of Chemical Engineering IIT Guwahati - Part 4
Steady Conduction One Dimensional
Slabs, cylinders and spheres; Critical
thickness of insulation
Objectives
Understand
the concept of thermal resistance and its
limitations, a
Dr. Senthilmurugan S. Department of Chemical Engineering IIT Guwahati - Part 6
Transient Conduction
Objectives
Assess when the spatial variation of temperature is negligible, and temperature
varies nearly uniformly with time, making the simplified lumped
Dr. Senthilmurugan S. Department of Chemical Engineering IIT Guwahati - Part 2
Conduction two-dimensional and
three-dimensional
Case 1
Steady state, Cube Geometry,
(General Energy Equation)
(Since, = 0 and )
Boundary conditions:
x=0, T=600 K
x=L, T=300
Dr. Senthilmurugan S. Department of Chemical Engineering IIT Guwahati - Part 7
Examples
Transient conduction
Transient Conduction
Example 3-1 (Yunus, Afshin)
The temperature of a gas stream is to be measured by a thermocouple whose junction
can be approxi
Dr. Senthilmurugan S. Department of Chemical Engineering IIT Guwahati - Part 5
Examples Steady conduction in slabs,
cylinders and spheres; Critical
thickness of insulation
Multilayer Conduction
Example 2-1 (J. P. Holman)
4/27/17 | Slide 2
An exterior wall
CL 204 : Heat Transfer
Tutorial 1
Question 1. A thin metal plate 1 m 1 m is placed on a rooftop. It receives radiant heat from
the sun directly at the rate of 170 W/m2. If heat transfer from the plate to the ambient occurs
purely by free convection, calcu
Dr. Senthilmurugan S. Department of Chemical Engineering IIT Guwahati - Part 7
Examples
Transient conduction
Transient Conduction
Example 3-1 (Yunus, Afshin)
The temperature of a gas stream is to be measured by a thermocouple whose
junction can be approxi
Dr. Senthilmurugan S. Department of Chemical Engineering IIT Guwahati - Part 1
Heat Transfer Overview
Conduction, Convection and
Radiation
Heat Transfer
Heat always moves from a warmer place to a cooler place.
Hot objects in a cooler room will cool to ro
Dr. Senthilmurugan S. Department of Chemical Engineering IIT Guwahati - Part 2
Laws of Heat Transfer
Conduction, Convection and
Radiation
The First Law of Thermodynamics
The first law of thermodynamics
(conservation of energy principle) states
that energy
Dr. Senthilmurugan S. Department of Chemical Engineering IIT Guwahati - Part 3
Heat Conduction
Basic equations of one-dimensional, twodimensional and three-dimensional
conduction
Objectives
4/27/17 | Slide 2
Derive basic equations for conduction heat tran