Module 9003 Assignments
There are two assignments for this module. Assignment 1 is a group assignment on Distillation. The assignment for the Absorption component
is a lab session which Hassan will explain to you.
Note that a defence of
your work at interview may be requested to assist in the assessment of all
assignments.
Module 9003 Assignment 1
Distillation
Lecturer gavin.duffy@dit.ie
This is a group assignment. Each group investigates a different binary
mixture. The choice is as follows:
Assessment
The assessment is broken down as follows:
Individual reflection on project 40%
Group report 30%
Group presentation 30%
Guideline for the individual reflection on this assignment
For the individual reflection you should:
·
Provide a short summary of what the assignment
involved
·
Describe your contribution to the assignment and how
you made this
·
Discuss issues that are still not clear to you and
provide some possible explanations for these or describe how you would go about
resolving these issues
·
You are part of a learning group in this assignment
so critically evaluate how your group worked (focus on what you and the others did,
i.e. actions, as opposed to who did what, i.e. avoid personality) and provide
suggestions for how you could improve.
Use examples to illustrate.
·
Provide some conclusions on this approach to
learning
Guideline assessment matrix for the report component of this assignment
|
Topic |
Max Mark |
|
Adherence to
objectives |
15 |
|
Implementation |
(50) |
|
VLE data and graph |
10 |
|
Mass balance |
10 |
|
Graphical design |
5 |
|
Height and diameter |
5 |
|
Reboiler/condenser |
5 |
|
Energy Balance |
10 |
|
Economics |
5 |
|
Justification of
decisions |
20 |
|
Presentation |
15 |
|
|
|
|
Total Mark |
100 |
Guideline assessment matrix for the presentation component of this
assignment
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Category |
Assessment Mark |
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0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
|
Multiplier |
Mark |
|
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|
none |
poor |
fair |
good |
very good |
excellent |
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Quality
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x 3 = |
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Communication |
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x 2 = |
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Understanding |
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x 5 = |
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(Content,
answers to questions, fulfilment of objectives) |
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Total (100) |
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Absorption
Lecturer ali.hassan@dit.ie
Part A: Please answer either problem 1 or
2
Problem No. 1 [15 marks]
Acetone is to be removed from a 5 per cent v/v acetone-air mixture by
scrubbing with water in a packed tower using countercurrent flow. The liquid
rate is 0.85 kg/m2s and the gas rate is 0.5 kg/m2s.
The overall absorption coefficient KGa may be taken as 1.5x10-4
kmol/[m3s(kN/m2)], partial pressure difference and the
gas-film resistance control the process.
What height of tower is required tower to remove 98% v/v of the acetone?
The equilibrium data for the mixture are:
Mole fraction acetone in gas: 0.0099
0.0196 0.0361
0.0400
Mole fraction acetone in liquid:
0.0076 0.0156 0.0306 0.0333
OR
Problem No. 2 [15 marks]
A bubble – cap column with 30 plates is to be used to remove n-pentane
from solvent by means of steam stripping. The inlet solvent contains 6 kmol of
n-pentane /100 kmol of pure solvent and it is desired to reduce the solute
content to 0.1 kmol/100 kmol of solvent. Assuming isothermal operation and an
overall plate efficiency of 30%, what is the specific steam consumption that is
kmol of steam required / kmol of solvent treated, and the ratio of the specific
and minimum steam consumptions. How many plates would be required if the ratio
is 2.0?
The equilibrium relation for the system may be taken as Ye=3.0X,
where Ye and X are expressed in mole ratios of pentane in the gas
and liquid phases respectively.
AND
Part B: Laboratory Practical [10 marks]
Details will be provided in class.