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I need help to do my assignment for Material and Energy balances .You can see the two assignments in the attachment.
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Assessment Cover Sheet
Assessment Title
Project
Assessment Type
Uncontrolled
Due Date
23-March-2024
Course Title
Group
Not must-pass
Course Code
EN7704T
Material and Energy Balances
Internal Moderator’s
Name
External Examiner’s
Name
Biraju J Sanghavi
Learner ID
Date Submitted
Learner Name
Programme
Code
Programme
Title
Lecturer’s Name
ENT8070
Bachelor of Engineering Technology (Chemical and Industrial Processes Engg)
Shaikha Ebrahim
By submitting this assessment for marking, I affirm that this assessment is my own work.
Learner Signature
SiSignature
Instructions:
1. This cover sheet must be completed (section in red below) and attached to your assessment before
submission in hard copy/soft copy.
2. The time allowed for this assessment is 11 Weeks.
3. This assessment carries 30% of overall grades distributed for assessing CILO 1,2,3,4 & 5.
4. The materials allowed for use in this assessment are Textbooks and Internet.
5. The use of generative AI tools is strictly prohibited.
6. References consulted (if any) must be properly acknowledged and cited.
7. The assessment has a total of 4 pages (including this page), PFD will be provided separately.
Do not write beyond this line. For assessor use only.
Assessor’s Name
Marking Date
Shaikha Ebrahim
Maks Obtained
Comments:
Saudi Aramco: Company General Use
Page 1 of 4
2023-24_S2_EN7704T_Project
Learning
Outcome No.
1
2
3
4
5
Learning Outcome Description
Apply the concepts of conservation of mass and energy to calculate the material and
energy requirements of a process for a non-reacting system
Estimate the extent of reaction in material balances for systems involving chemical
reactions
Demonstrate advanced knowledge of recycle and bypass streams to perform
material balances for a non-reacting system
Apply the concept of energy to calculate energy requirement of a process for a
reacting system
Work individually or in teams to evaluate theoretical and excess air requirement for
a combustion process using flue gas analysis
[Table 1: LO]
Instructions
•
This Assessment contributes 30% of the Final Grade
•
Evidence must be submitted in group.
•
Any plagiarized work will be awarded zero mark.
•
Use Font theme: Times New Roman/Arial/Tahoma, Font size: 12, Paragraphs: 1.5-line spacing.
•
Student should use periodic table to find standard atomic weight.
•
Upload your long report electronically in Moodle on or before the due date or Submit to your tutor.
•
The total number of pages for this assignment is 4 pages including the cover page.
•
Dimethyl Ether (DME) Process Flow Diagram will be provided separately along with the assessment.
Process: (Dimethyl Ether Manufacturing)
Scenario:
You have been recently appointed as a junior engineer in reputed process engineering consultancy company, engaged to
provide detailed engineering for chemical manufacturing process. As a part of technical team, your supervisor asked you
to complete several tasks related to methanol to dimethyl ether manufacturing process material balance calculations.
Introduction
DME is used primarily as an aerosol propellant. It is miscible with most organic solvents, has a high solubility in water,
and is completely miscible in water. Recently, the use of DME as a fuel additive for diesel engines has been investigated
due to its high volatility and high cetane number. The production of DME is via the catalytic dehydration of methanol
over an acid zeolite catalyst. The main reaction as follows.
Equation 1)
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Page 2 of 4
Answer the following tasks.
Task 1: Material Balance of separation columns
Perform the material balance calculation for distillation tower T-201 and T-202 to confirm the Process Flow Diagram
(PFD) values.
(20 Marks)
Task 2: Material balance over reactor
a) Calculate the stoichiometric requirement of methanol to manufacture DME 50000 ton/year (5 Marks)
For the attached DME process,
b) Calculate the %conversion of methanol. (5 Marks)
c) Calculate %excess methanol fed to the reactor. (5 Marks)
d) Calculate %Yield for methanol to DME. (5 Marks)
Task 3: Methanol recycles
Perform the material balance calculation for recycle of methanol from T-202 to reactor feed section to confirm the
Process Flow Diagram (PFD) values at fresh methanol and recycled methanol junction point.
(10 Marks)
Task 4: Energy balance and Energy Requirement
a) Calculate heat exchanged at E-201 and E-203
(20 Marks)
0 = a + bT + cT2 + dT3 + eT4 , kJ/(kmole.K) or J/(mole.K)
Component
Component
Formula
Name
CH3OH (g)
a
b
c
d
e
Methanol
3.449 x 101
-2.918 x 10-2
2.868 x 10-4
-3.125 x 10-7
1.098 x 10-10
(CH3)2O (g)
Dimethyl
Ether
4.890 x 101
-8.816 x 10-3
4.243 x 10-4
-5.128 x 10-7
1.931 x 10-10
H2O (g)
Water
3.404 x 101
-9.650 x 10-3
3.299 x 10-5
-2.044 x 10-8
4.302 x 10-12
[Table 2: 0 constants for task 4a)]
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Page 3 of 4
b) Calculate standard heat of reaction ∆ for DME production reaction.
(5 Marks)
Component
Standard Heat of Formation ∆ kJ/mole at 298 oC
CH3OH (g)
-200.94
(CH3)2O (g)
-184
H2O (g)
-241.82
[Table 3: Standard Heat of Formation Data for task 4b)]
c)
Obtain an empirical equation relating the heat of reaction and the temperature.
(10 Marks)
Task 5: Combustion of fuel at Boiler
Natural gas of following composition is combusted with 28% excess air at boiler to produce steam for DME plant, For
this natural gas combustion process, Calculate the flue gas analysis.
(15 Marks)
Natural gas composition in %
Methane (CH4)
Ethane (C2H6)
Propane (C3H8)
Butane (C4H10)
81.4%
7.8%
5.6%
5.2%
[Table 4: Natural gas composition for task 5a)]
——————————End of Assessment Tasks————————-
Saudi Aramco: Company General Use
Page 4 of 4
Assessment Cover Sheet
Assessment Title
Assignment
Assessment Type
Uncontrolled
Due Date
16-March-2024
Course Title
Material and Energy Balances
Internal Moderator’s Name
Individual
Course Code
Not must-pass
EN7704T
Biraju Singhavi
External Examiner’s Name
Instructions:
1. This cover sheet must be completed (section in red below) and attached to your assessment before
submission in hard copy/soft copy.
2. The time allowed for this assessment is 30 days.
3. This assessment carries 100 marks distributed to a total of three questions assessing CILO3, CILO4
and CILO5.
4. The use of generative AI tools is strictly prohibited.
5. References consulted (if any) must be properly acknowledged and cited.
6. The assessment has a total of 5 pages.
Learner ID
Date Submitted
Learner Name
Programme Code
ENT8070
Programme Title
BEng Tech (Chemical and Industrial Processes Engineering)
Lecturer’s Name
By submitting this assessment for marking, I affirm that this assessment is my own work.
Learner Signature
Do not write beyond this line. For assessor use only.
Assessor’s Name
Marking Date
Maks Obtained
Comments:
Page 1 of 5
Saudi Aramco: Company General Use
Learning
Outcome No.
3
4
5
Learning Outcome Description
Weightage (%)
Demonstrate advanced knowledge of recycle and bypass
streams to perform material balances for a non-reacting
system
Apply the concept of energy to calculate energy
requirement of a process for a reacting system
Work individually or in teams to evaluate theoretical and
excess air requirement for a combustion process using flue
gas analysis
25%
25%
50%
Instructions
•
This Assignment contributes 30% of the Final Grade
•
Evidence must be submitted individual.
•
Any plagiarized work will be awarded zero mark
•
Use Font theme: Times New Roman/Arial/Tahoma, Font size: 12, Paragraphs: 1.5-line spacing.
•
Student should use periodic table to find standard atomic weight
•
Upload your long report electronically in Moodle on or before the due date or Submit to your tutor
•
The total number of pages for this assignment is 5 pages including the cover page
Page 2 of 5
Saudi Aramco: Company General Use
Task 1 [LO 3]: Recycle operations
a)
[25 Marks]
Reverse Osmosis Cell with Recycle
Sea water is to be desalinized by reverse osmosis with brine recycling at following plant scheme shown in
figure 1. For the given plant scheme and data, answer the following
[12 Marks]
[Figure 1: Recycled plant schematic for task 1a)]
(i)
Calculate the rate of brine waste (B) (4 Marks)
(ii)
Calculate the rate of desalinized water (D) (4 Marks)
(iii)
Calculate the ratio of Recycled stream (R) to the Reverse osmosis cell outlet (W) flow (4 Marks)
b) Drying Operation with Recycle
Feed solid is dried in a dryer with product recycle at following plant scheme as shown in figure 2. For the given
plant scheme and data, answer the following
[13 Marks]
[Figure 2: Recycled plant schematic for task 1b)]
(i)
Calculate mixed feed to the dryer (M) (5 Marks)
(ii)
Calculate the ratio of recycled stream (R) to the Dryer out (N) (5 Marks)
(iii)
Calculate Product obtained (P) (3 Marks)
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Page 3 of 5
Task 2 [LO 4]: Energy and Energy Requirement
[25 Marks]
a) Enthalpy Balance of gas stream
Analyze enthalpy balance calculation for the gas stream having composition as per table 1.
calculate the heat content of 1 kmole gas mixture from 298 C to 890 C using given 0 data of gas mixture
components as per table 2.
[12 Marks]
Gas
SO2
O2
SO3
N2
Composition
(Mole %)
7.09
10.55
0.45
81.91
[Table 1: Gas mixture composition for task 2a)]
0 = a + bT + cT2 + dT3 , kJ/(kmole.K) or J/(mole.K)
Gas
a
b x 103
c x 106
d x 109
SO2 (g)
24.7706
62.9481
-44.2582
11.122
O2 (g)
26.0257
11.7551
-2.3426
-0.5623
SO3 (g)
22.0376
121.624
-91.8673
24.3691
N2 (g)
29.5909
-5.141
13.1829
-4.968
[Table 2: 0 constants for task 2a)]
b) Energy balance with chemical reaction
Perform energy balance calculation for following chemical reaction.
[13 Marks]
(i) Obtain an empirical equation relating the heat of reaction and the temperature. (10 Marks)
(ii) Using the same expression in task 2b(i), calculate the heat of reaction at 890 C as per table 3 data. (3 Marks)
Data Given
∆ 0 = -98910 kJ/kmole
0 = a + bT + cT2 + dT3 , kJ/(kmole.K) or J/(mole.K)
Gas
a
b x 103
c x 106
d x 109
SO2 (g)
24.7706
62.9481
-44.2582
11.122
O2 (g)
26.0257
11.7551
-2.3426
-0.5623
SO3 (g)
22.0376
121.624
-91.8673
24.3691
[Table 3: 0 constants for task 2]
Page 4 of 5
Saudi Aramco: Company General Use
Task 3 [LO 5]: Combustion Process
[50 Marks]
a) %Excess air and Fuel Ratio
[20 Marks]
The Orsat flue gas analysis from a boiler house chimney by volume is provided as below If there is complete
combustion takes place, Answer the following
CO2 = 11.5%; O2=4.5%;
(i)
Calculate the % Excess air (10 Marks)
(ii)
Calculate the C to H ratio in the fuel (10 Marks)
N2=84%
Note: Carbon and Hydrogen gas fuel are used in boiler
b) Air Requirement and Gas analysis
[30 Marks]
The ultimate coal sample analysis is given below, For the given fuel, answer the following
C=66%; H2=3%; S=0.5%; Ash = 9.5%; N2=1.5%; O2=19.5%
(i)
Calculate Theoretical oxygen requirement per kg of coal (10 Marks)
(ii)
Calculate Theoretical dry air requirement per kg of coal (5 Marks)
(iii)
Find Orsat Analysis of flue gas when coal burned with 90% excess dry air (15 Marks)
————————-End of Assessment Pages———————–
Page 5 of 5
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