View
247
Download
1
Category
Preview:
Citation preview
7/31/2019 Effect of Mixing in Stirred Tank Reactor
1/33
Click to edit Master subtitle style
6/14/12
EFFECT OF MIXING IN A STIRRED
TANK REACTOR
UNDER THE ESTEEMED GUIDANCE OF
B.DHANANJANEYULU M.Tech&RAMESH.S.BHANDE M.Tech(Ph.D)
R.SURENDRA KIRAN
M.S.RAVI TEJA G.GANESHT.SRIHARSHAVARDHAN
7/31/2019 Effect of Mixing in Stirred Tank Reactor
2/33
6/14/12
ESSENSE OF THE PROJECT
To study the performance of a Stirred Tank Reactor
using different parameters.
To design a better and a controlled mixing process
that utilizes raw materials and avoids pollution.
To cut down the mixing expenditure.
7/31/2019 Effect of Mixing in Stirred Tank Reactor
3/33
6/14/12
PARAMETERS CONSIDERED
Type of mixing process
Lateral mixing
Axial mixing
Type of flowLaminar Flow
Turbulent Flow
Type of reactor
Batch reactor
Type of mixers to be used
Mechanical Agitators
7/31/2019 Effect of Mixing in Stirred Tank Reactor
4/33
6/14/12
KEY PROCESS VARIABLES
Residence time ()
Volume (V)
Temperature (T) Pressure (P)
Concentrations of chemical species (C1, C2.)
7/31/2019 Effect of Mixing in Stirred Tank Reactor
5/33
6/14/12
Three blade marinetypeDouble flight ribbon
type:.
A high efficiency turbulent flowimpeller used on our smallestturbine agitators at direct drivemotor speeds.
The high solidity permitsoperation nearer the boilingpoint without cavitations.
It is the most efficient blender ofall existing close clearanceagitators
. Generally used for applicationswhere viscosities are ordinarilygreater than 30,000 MPa.
TYPES OF IMPELLERS
7/31/2019 Effect of Mixing in Stirred Tank Reactor
6/33
6/14/12
Axial impeller :Straight BladeImpeller :
A reasonably cost effective impellerin both turbulent and laminar flow.
Good impeller for applicationswhere the viscosity changes over awide range causing the flow regimeto vary between turbulent and
laminar flow. A reasonably cost effective impeller
for solids suspension.
A cost effective impellerfor operation very near thefloor of a tank for agitatingthe heel in solidssuspension applications.
TYPES OF IMPELLERS
7/31/2019 Effect of Mixing in Stirred Tank Reactor
7/336/14/12
PROCEDURE
1. Fill the overhead tanks with NaOH and EthylAcetate.
2. Adjust the flow rates of NaOH and Ethyl Acetateuntil the flow reaches steady state.
3. Switch on the stirrer.
4. Add 10 ml of Glacial Acetic Acid to the reactor
5. Collect the samples from outlet for every 30 seconds
of time interval.6. Take 10ml from each sample and transfer it to the
conical flask which contains 10ml HCl.
7. Titrate the sample with NaOH by adding
phenolphthalein indicator, till colorless solution
7/31/2019 Effect of Mixing in Stirred Tank Reactor
8/336/14/12
FORMULAE
QNaOH * NNaOH
CAO =
QNaOH + QETHYL ACETATE
VETHYL ACETATE *
SETHYL ACETATE =
M.W.(1+VETHYL ACETATE )
7/31/2019 Effect of Mixing in Stirred Tank Reactor
9/33
6/14/12
CBO = QETHYL ACETATE *SETHYL ACETATE
QNaOH + QETHYL ACETATE
M = CBOCAO
CA = GNaOH
VSAMPLE
XA = 1 - CA
CAO
= V
QNaOH + QETHYL ACETATE
7/31/2019 Effect of Mixing in Stirred Tank Reactor
10/33
6/14/12
OBSERVATIONS AND CALCULATIONS
7/31/2019 Effect of Mixing in Stirred Tank Reactor
11/33
6/14/12
EFFECT OF MIXING WITHOUT STIRRER
S.NO QNaOH (LPH)
QETHYLACETATE
(LPH)
V NaOHRUNDOWN
ml
1 12.5 15 6.5
2 10 12.5 4.7
3 7.5 10 3.3
4 5 7.5 3.0
5 2.5 5 2.0
7/31/2019 Effect of Mixing in Stirred Tank Reactor
12/33
6/14/12
S NO sec
XA
1 0.03709 0.0001
2 0.0453 0.010
3 0.0582 0.0109
4 0.0816 0.112
5 0.136 0.119
7/31/2019 Effect of Mixing in Stirred Tank Reactor
13/33
6/14/12
RESIDENCE TIME Vs CONVERSION
7/31/2019 Effect of Mixing in Stirred Tank Reactor
14/33
6/14/12
CONVERSION BY VARYING RPMs
S.No XA AT 400RPM
XA AT 600RPM
XA AT 1000RPM
sec
1 0.0512 0.0841 0.112 0.03709
2 0.0740 0.099 0.344 0.045
3 0.0911 0.156 0.499 0.058
4 0.202 0.331 0.546 0.0816
5 0.335 0.584 0.844 0.136
7/31/2019 Effect of Mixing in Stirred Tank Reactor
15/33
6/14/12
RESIDENCE TIME Vs CONVERSION
7/31/2019 Effect of Mixing in Stirred Tank Reactor
16/33
6/14/12
CONVERSION WITH A THREE blade marine TYPEimpeller
S.No QNaOH(LPH)
QETHYLACETATE (LPH)
Volume of NaOHrundown
ml
1 12.5 15 6.9
2 10 12.5 6.5
3 7.5 10 6.3
4 5 7.5 6.1
5 2.5 5 6.0
7/31/2019 Effect of Mixing in Stirred Tank Reactor
17/33
6/14/12
S.No XA Sec
1 O.O114
0.037
2 0.02021 0.045
3 0.02117 0.058
4 0.19905 0.0816
5 0.20704 0.136
7/31/2019 Effect of Mixing in Stirred Tank Reactor
18/33
6/14/12
RESIDENCE TIME Vs CONVERSION
7/31/2019 Effect of Mixing in Stirred Tank Reactor
19/33
7/31/2019 Effect of Mixing in Stirred Tank Reactor
20/33
6/14/12
S NO XA Sec
1 0.0321 0.0370
2 0.05705 0.045
3 0.06774 0.058
4 0.18905 0.0816
5 0.33903 0.136
7/31/2019 Effect of Mixing in Stirred Tank Reactor
21/33
6/14/12
RESIDENCE TIME Vs CONVERSION
7/31/2019 Effect of Mixing in Stirred Tank Reactor
22/33
6/14/12
CONVERSION WITH AN AXIAL HIGH EFFICIENCYIMPELLER
S NO QNaOH(LPH)
QETHYL ACETATE(LPH)
VNaOH RUNDOWNml
1 12.5 15 9.0
2 10 12.5 8.5
3 7.5 10 7.0
4 5 7.5 6.9
5 2.5 5 6.5
7/31/2019 Effect of Mixing in Stirred Tank Reactor
23/33
6/14/12
S NO XA Sec
1 0.045 0.037
2 0.101 0.045
3 0.194 0.058
4 0.310 0.0816
5 0.381 0.136
7/31/2019 Effect of Mixing in Stirred Tank Reactor
24/33
6/14/12
RESIDENCE TIME Vs CONVERSION
7/31/2019 Effect of Mixing in Stirred Tank Reactor
25/33
6/14/12
CONVERSION WITH A DOUBLE flight ribbon impeller
S NO QNaOH(LPH)
QETHYL ACETATE(LPH)
VOLUME OF NaOHRUNDOWN
ml
1 12.5 15 8.4
2 10 12.5 7.5
3 7.5 10 6.7
4 5 7.5 6.5
5 2.5 5 6.4
7/31/2019 Effect of Mixing in Stirred Tank Reactor
26/33
6/14/12
S NO XA Sec
1 0.0421 0.037
2 0.0631 0.045
3 0.082 0.058
4 0.210 0.0816
5 0.348 0.136
7/31/2019 Effect of Mixing in Stirred Tank Reactor
27/33
6/14/12
RESIDENCE TIME Vs CONVERSION
7/31/2019 Effect of Mixing in Stirred Tank Reactor
28/33
6/14/12
COMPARISION OF VARIOUS TYPES OF IMPELLERS BYTAKING CONVERSION AS FACTOR
7/31/2019 Effect of Mixing in Stirred Tank Reactor
29/33
6/14/12
APPLICATIONS
Stirred tank reactors are frequently used in thechemical and biochemical industry to accomplishmixing tasks.
Stirred tank reactors are used for the mixing ofvarious types of polymerizations, precipitations andfermentations.
A better designed and controlled mixing process leadsto significant pollution prevention, better usage of rawmaterials and avoids expensive separation costsdownstream in the process.
CONCLUSION
7/31/2019 Effect of Mixing in Stirred Tank Reactor
30/33
6/14/12
CONCLUSION
From our project we were able to study the following: Inefficient mixing has large negative effects on the yield and
selectivity of a broad range of chemical reactions, because slowmixing can retard desired reactions.
The speed of the agitators and its involvement in the effect ofmixing using a Tachometer and a Dimmerstat.
We have taken different stirrers and achieved maximumconversion and studied the effect of mixing varying RPM andfound out the properties of different impellers and their rate ofmixing using different liquids.
The best conversion we have achieved for axial impellerbecause of the twisted blade structure when compared withother three impellers.
7/31/2019 Effect of Mixing in Stirred Tank Reactor
31/33
6/14/12
SCOPE FOR FUTURE WORK
This study can be extended by varying differentreactors , agitators and solutions
The study can be done in closed type vessels wheredifferent fluids can be taken.
7/31/2019 Effect of Mixing in Stirred Tank Reactor
32/33
6/14/12
REFERENCES
Schmidt, Lanny, The Engineering Of ChemicalReactions. NY Oxford Press, 1998.
Octave Levenspiel, The Chemical Omnibook,OregonSt Univ Bookstores 1993.
Effect Of Mixing in a Stirred Tank Reactor- ChemicalEngineering Journal.
Warren L.McCabe, Julian Smith, Peter Harriot. Unit
Operations Of Chemical Engineering-2005.Bakker R A, Micro mixing in Chemical Reactors
Thesis ,Delft University,1996.
7/31/2019 Effect of Mixing in Stirred Tank Reactor
33/33
6/14/12
THANK YOU
Recommended