1. Production of
Bioethanol
Presented by
TARUN JAMI
MS Environmental Science,
IR&D, Gujarat Forensic Sciences University,
Gandhinagar

2. Introduction of Bioethanol
 Ethanol has evolved into an essential part of
commercial gasoline
 About 10% v/v of ethanol is added to commercially
available petrol in India
 In the USA and countries belonging to the colder region
addition of 15% ethanol is mandatory
 Ethanol alone can be used as fuel for automobiles –
further study is necessary to make this possible

3. Sources of Bioethanol
 Sugarcane has been the primary source of ethanol in
India
 Other sugar rich sources also yield ethanol:
 Sugar Beet
 Corn
 Wheat
 Molasses
 Sweet Sorghum
 Algae

4. SWEET SORGHUM
Production of Bioethanol from Sweet Sorghum

5. Intro of Sweet Sorghum
 Type of grass that thrives in
warm and dry climates
 Type of sorghum plant that
has high sugar content
 Primarily reared for
feedstock, livestock feed,
syrup, etc
 Identified as a material with
high potential for biofuel
 Bioethanol is produced from
the Sorghum juice

6. Production Process

7. Juice Extraction
 Juice is extracted from the stalk of the plant
 About 70% of the stalk is juice
 Stalk is squeezed, pressed from roller mills
 Extraction of juice is similar to extraction of sugar cane
juice
 Water extraction method is found to be the most
efficient extraction method

8. Juice Extraction

9. Juice Fermentation
 The extracted juice is filtered and prepared
 Fermentation happens through the use of Saccharomyces
cerevisiae (Yeast)

10. FERMENTATION
 C6H12O6 + Zymase 2C2H5OH + 2CO2
 Zymase is an enzyme complex isolated mainly from
Yeast
 Different Zymase complexes have been isolated to
improve the speed and efficiency of the fermentation
process

11. Finishing
 Converted Sorghum juice (Beer) undergoes distillation
to produce hydrated ethanol
 Beer further undergoes dehydration to produce
anhydrous ethanol (final product)

12. Thank You