March 13
DBEB, IIT Delhi
Bioprocess
Technology
TEAM
Ravinder Kuhad Priyansh Jorwal
Shiven
2021BB10008
2021BB10013
2021BB10327
PROFESSOR
COURSE
Ashish Misra
BBL431
Table of
Contents
Page
I
Motivation
3
II
Project Introduction and Demo
5
III
Assumptions
8
IV
Mass balance model
12
V
Overall Mass balance and Results
21
I
Motivation
Our
motivation
for
choosing
the
bioethanol mass and energy balance
project
is
rooted
in
its
practical
relevance and potential impact. By
examining the intricacies of bioethanol
production, we seek to deepen our
understanding of its efficiency and
optimise
balance.
its
mass
Leveraging
and
energy
tools
like
biosteam and DWSIM allows us to
conduct precise analyses, contributing
to advancements in renewable energy
technologies
2
Project Introduction
I
Project Introduction
This project explores the construction of a bioethanol
production plant utilizing 8 tons of sweet potatoes daily.
Focused on sustainability, bioethanol presents a renewable
alternative to fossil fuels, with sweet potatoes offering an
efficient feedstock due to their high starch content. Our
approach includes material and energy balance analyses,
reactor and distillation unit design, and a cost evaluation. By
leveraging bioethanol, this initiative aims to contribute to the
diversification of energy sources, reducing reliance on
imported oil and advancing towards a sustainable energy
future.
I
Project Introduction
Figure 1. System diagram of typical sweet potato‐to‐ethanol production process
Assumptions in our mass balance
II
Assumptions
The temperature of the hydrolysis is 40℃ and its duration is 2 hour.
The fermentation temperature is 80 ℃ for 36 hours.
The distillation temperature is 80℃ and takes 1.5 hours.
Concentration of α-amalyse enzyme (800ml/t sweet potatoes).
Yeast concentration of S. cerevisiae (3.4 kg/t sweet potato).
Conversion of both bioreactors 92%
II
Assumptions
Composition of Sweet Potato
Moisture
8.12%
Total Protein
10.86%
Fiber
1.65%
Ash
2.15%
Others
4.22%
The amount of Starch(cellulose) from 8 tone of sweet potatoes per day
= 0.73 × 208.33 =243.32 kg/hr
Mass balance model
III
Mass Balance Model
In
(Kg/hr)
Process Unit
Out
(Kg/hr)
Input + Generation – Output – Consumption = Accumulation
Amount of Sweet Potatoes = 8 tone/day
= 333.32 kg/hr
III
Mass Balance on Miller and Filter
S1
Miller
S2
Filter
S4
Starch
S1 = 333.22 Kg/hr
S3 = S1-S4 = 333.22- 243.32 = 90 Kg/hr
S3
Waste
III
Mass Balance Model
III
Mass Balance on Hydrolysis
Water
Cellulose
Hydrolysis
Glucose
Unreacted
Cellulose
III
Mass Balance on Fermentor
Glucose
Yeast
Fermentation
Ethanol CO2 Unreacted
Materials
III
Mass Balance Model
III
Mass Balance Table
Compund
In(Kg/hr)
Out(Kg/hr)
Ethanol
0
116.95
Glucose
248.72
19.9
Cellulose
19.5
19.5
Yeast + Water
0.832 + 8.32
0.832 + 8.32
Carbon Dioxide
0
111.86
Total
277.372
277.372
III
Mass Balance on Distillation
Feed
Now we are assuming:
1. Overhead has 98% conversion
2. Bottom head has 2% conversion
Distillation
Waste
Ethanol
Feed stream (F)
164.67 kg/hr
Ethanol
116.95 kg/hr
Glucose
19.9 kg/hr
Cellulose
19.5 kg/hr
Water
8.32 kg/hr
III
Mass Balance Model
III
Mass Balance on distillation
Compund
In(Kg/hr)
Out- D(Kg/hr)
Out- B(Kg/hr)
Ethanol
116.95
114.611
2.339
Glucose
19.9
0
19.9
Cellulose
19.5
0
19.5
0.1664
8.15
Water
8.32
Total
164.67
III
Overall Mass Balance
Carbon Dioxide
Sweet Potato
Water
Yeast
α amalyse
Overall Material
Balance
Ethanol
Waste
III
Overall Mass Balance
Input(Kg/hr)
Output(Kg/hr)
Sweet Potato = 333.22
CO2 = 111.86
Water = 24.872
Ethanol = 116.95
Yeast + Water = 9.152
Waste = 138.4396
amalyse = 0.0056
Total
367.2496
IV
References
https://academics.su.edu.krd/public/profiles/mohammed.barzanjy/teaching/teaching-377-72571685544287-1.pdf
https://www.sciencedirect.com/science/article/pii/S0960852413004136
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3795201/
Further Work to be
done?