bioethanol production

2.  Introduction
 Production of Bioethanol
 Bioethanol Need of future
 Advantages & Disadvantages


4. Raw material :
Wheat/Grains/Corn/Sugar-cane can be used
to produce ethanol. (Basically, any plants that
composed largely of sugars)
The raw materials used in the manufacture of
ethanol via fermentation are conveniently
classified into three main types of raw
materials: sugars, starches, and cellulose

5. Potato
 Mashing and Washing
 Cooking
 Starch hydrolysis
1- Liquefaction 2-saccherification
Fermentation
Distillation
Ethanol

6. • Used as a raw material in ethanol
production
• By exposing starch from peel of corn with
water
• Enzymes are added to the mash that
convert starch to dextrose, a simple
sugar.
• yeast is added and conversion from
sugar to ethanol and carbon
dioxide begins.

7.  Extraction of sugar
 Then it is added to yeast for fermentation
process
 lactic acid, hydrogen, carbondioxide
,ethanol are produced

8. Ethanol-powered
buses (E95) -
still a pilot
project in
Brazil
Flex-fuel motorcycles
Brazilian-made
crop dusting
planes
running on
ethanol

9. › Exhaust gases of ethanol are much cleaner
› ethanol-blended fuels such as E85 (85% ethanol and 15% gasoline)
reduce up to 37.1% of GHGs
› output of energy during the production is more than the input
› the CO2 released in the bioethanol production process is the same
amount as the one the crops previously absorbed during
photosynthesis

10.  Not as efficient as petroleum
› energy content of the petrol is much higher than bioethanol
› its energy content is 70% of that of petrol
 Engines made for working on Bioethanol cannot be used for
petrol or diesel
› Due to high octane number of bioethanol, they can be
burned in the engines with much higher compression ratio
 Used of phosphorous and nitrogen in the production
› negative effect on the environment
 Cold start difficulties
› pure ethanol is difficult to vaporise

11.  For bioethanol to become more sustainable to replace petrol,
production process has to be more efficient
› Reducing cost of conversion
› Increasing yields
› Increase the diversity of crop used
 As microbes are use to convert glucose into sugar which is ferment
in bioethanol
› Microbiology and biotechnology will be helpful in the genetic
engineering