This document discusses bioethanol as an alternative fuel source. It outlines various sources of bioethanol, including first generation sources like sugar and starch, and second generation sources like cellulose. The document describes the process of producing bioethanol from lignocellulose, including pre-treatment, hydrolysis, and fermentation steps. It notes that bioethanol production has advantages like being renewable and reducing carbon emissions, but also has disadvantages like potentially causing deforestation if feedstocks are not sustainable.

2. By:-

3. CONTENTS
Abstract
Introduction
Possible sources of Bioethanol
First generation Bioethanol
Second generation Bioethanol
Why Bioethanol?
Scheme process of production of Bioethanol
Lignocellulose
Advantages and Disadvantages
Conclusion
References

4. ABSTRACT
Rapid industrialization and urbanization has
changed the present day scenario.
As per increasing human demands we need to
discover alternative cheaper sources for
fulfilment of worldwide demand.
One such technique is production of
bioethanol alternative to the present petrol and
diesel from organic waste by using
microorganisms such as bacteria and fungi.

5. BIOETHANOL
Renewable
Environmental friendly
Substitute of petrol
Organic wastes can be
converted to bioethanol by
fermentation.

6. 3d structure
of ethanol
Molecular structure
Of ethanol

7. POSSIBLESOURCES OF ETHANOL
Bioethanol and
Co-products
sugar
starch
cellulose

8. First Generation Bioethanol

9. SECOND GENERATION BIOETHANOL
LIGNOCELLULOSE
MOST PREFERABLE

10. WHY BIOETHANOL?????
Alternative fuel having advantage over
fossil fuels
Uses plant as raw material and decreases
accumulation of carbon
Increases the efficiency of combustion

11. Step 1
P r e -
t r e a t m e n t
p r o c e s s
Aimed to break
down the lignin
structure and
disrupt the
crystalline str.
of cellulose
Step 2 Step 3
Aimed to
change
glucose
Into
BIOETHANOL
Aimed to
change
cellulose
into
GLUCOSE
Fe r m e n t a t i o n
p r o c e s s
H y d r o l y s i s
p r o c e s s
BIOETHANOL PRODUCTION PROCESS

12. WHY LIGNOCELLULOSE??????
It is abundant in nature.
It is renewable.

13. COMPOSITIONOF LIGNOCELLULOSE
6 c a r b o n s u g a r s
C E L L U L O S E
A S H
E X T R A C T I V E S
L I G N I N ( p h e n o l s )
H E M I C E L L U L O S E

14. PRETREATMENT OF LIGNOCELULLOSE
Pretreatment have a goal to improve
the digestibility of lignocellulosic biomass

15. 1
PROCESS OF
PRODUCTION OF
BIOETHANOL
2
3
4
5

16. ADVANTAGES AND DISADVANTAGES
Advantages
 Ethanol is Renewal
resources.
 Ethanol burns more
cleanly in air than
petroleum.
 The use of Ethanol
reduce carbon dioxide
emissions.
Disadvantages
 Large amounts
leading to problems
such as soil erosion,
deforestation.
 Typical current
engines would
require modification.
 Demands strong
technical knowledge.

17. CONCLUSION
Bioethanol is the most potential renewable
energy source to mitigate this energy crisis.
This process is cost effective.
Does not yield any toxic residues.
Hence it can be run as a small industries.

18. REFERENCES
www.biosciencejournals.com
www.ncbi.nlm.nih.gov
Tahemzadeh, M.J. and K. Karini, Pretreatment
Of lignocellulosic wastes to improve ethanol.
International journal of Molecular Science
www.sciencedirect.com