Biotechnology for Sustainability: Achievements, Challenges and Perspectives

Biotech Sustainability (2017)
Biodiesel Production for Sustainability
Meena Devi et al.
diesel fuel.
Degrades more rapidly than diesel
fuel, minimizing the environmental
consequences of biofuel spills.
Lower emissions of contaminants:
carbon monoxide, particulate matter,
polycyclic aromatic hydrocarbons,
aldehydes.
Lower health risk, due to reduced
emissions of carcinogenic substances.
No sulfur dioxide (SO 2 ) emissions.
Higher flash point (100 °C minimum).
May be blended with diesel fuel at
any proportion; both fuels may be
mixed during the fuel supply to
vehicles.
Excellent properties as a lubricant.
It is the only alternative fuel that can
be used in a conventional diesel
engine, without modifications.
Used cooking oils and fat residues
from meat processing may be used as
raw materials.
There are certain disadvantages of
using biodiesel as a replacement for diesel
fuel that must be also taken into
consideration:
Slightly higher fuel consumption due
to the lower calorific value of
biodiesel.
Slightly higher nitrous oxide (NOx)
emissions than diesel fuel.
Higher freezing point than diesel fuel.
This may be inconvenient in cold
climates.
It is less stable than diesel fuel, and
therefore long-term storage (more
than six months) of biodiesel is not
recommended.
May degrade plastic and natural
rubber gaskets and hoses when used
in pure form, in which case
replacement with Teflon components
is recommended.
It dissolves the deposits of sediments
and other contaminants from diesel
fuel in storage tanks and fuel lines,
which then are flushed away by the
biofuel into the engine, where they
can cause problems in the valves and
injection systems. In consequence, the
cleaning of tanks prior to filling with
biodiesel is recommended. It must be
noted that these disadvantages are
significantly reduced when biodiesel
is used in blends with diesel fuel.
3. History of biodiesel
Dr. Rudolf Diesel actually
invented the diesel engine to run on a
myriad of fuels including coal dust
suspended in water, heavy mineral oil,
and, vegetable oil. Dr. Diesel’s first
engine experiments were catastrophic
failures. But by the time he showed his
engine at the World Exhibition in Paris in
1900, his engine was running on 100%
peanut oil. Dr. Diesel was visionary. In
1911, he stated that “the diesel engine can
be fed with vegetable oils and would help
considerably in the development of
agriculture of the countries which use it’.
In 1912, Diesel said, “The use of
vegetable oils for engine fuels may seem
insignificant today. But such oils may
become in course of time as important as
petroleum and the coal tar products of the
present time”. No doubt, this statement
has come to stay. Since Dr. Diesel’s
untimely death in 1913, his engine has
been modified to run on the polluting
petroleum fuel we now know as “diesel.”
Nevertheless, his ideas on agriculture and
his invention provided the foundation for
a society fueled with clean, renewable,
locally grown fuel. Today throughout the
world, countries are returning to using
this form of fuel due to its renewable
source and reduction in pollution
(Owolabi et al., 2012).
4. Oil crops in India
The various oil sources are
classified as edible and non-edible. The
edible sources like groundnut, peanut etc
are primarily used to meet the food
requirement. India is not using vegetable
oils derived from rapeseed & mustard,
soybean or oil palm for the production of
ISBN: 978-967-14475-3-6; eISBN: 978-967-14475-2-9 263