Increased demand for energy, crude oil price increase, global
warming due to green house gasses missions, environmental
pollution, and the fast diminishing supply of fossil fuels are the
major key factors leading to the search for alternative sources of
energy Biodiesel has recently attached much attention, given that
it has various advantages. It provides an alternative to petroleum-
based fuel, it is renewable and non-toxic fuel, it allows a favorable
energy balance, and it is fewer harmful emissions
[2]
. Furthermore,
the Thai government has promoted the production and the use of
biodiesel as a substitute diesel fuel and to promote the use of
alternative energy made from domestic crops
[3]
. At present, biodiesel
production capacity in Thailand is approximately 1.5 million liters per
day with 43 biodiesel plants registered with the Department of
Alternative Energy Development and Ef
fi
ciency
[4]
.